FRICTION BELT DRIVES Fenner friction belt drives have set the pace for over a century and will continue to do so. Our comprehensive range of products combines state-of-the-art belt materials and manufacturing methods, with optimised Taper-Lock ® pulley designs and conformity to all ISO and other industry standards, to give a cost-effective solution to any friction belt transmission requirement. Fenner Power Transmission Distributors also support the range with unrivalled experience in the application of friction belt drive systems. CLASSIC PB V-BELTS Z, A, B, C & D SECTIONS TO ISO, BS & RMA STANDARDS ANTI-STATIC PAGE 59 POWER PLUS PB & WEDGE BELTS SPZ, SPA, SPB, SPC SECTIONS, TO ISO, BS & RMA STANDARDS ANTI-STATIC PAGE 60 TAPER-LOCK ® V PULLEYS OPTIMISED TAPER LOCK DESIGN DUAL DUTY GROOVES TO ISO & BS STANDARDS PAGE 80 BANDED & LINK BELTING BANDED V & WEDGE BELTS BANDED FIT ISO OR RMA PULLEYS RIVET-LESS POWERTWIST LINK BELTS PAGE 93 VARIABLE SPEED BELTS/PULLEYS PAGE 97 INSTALLATION & MAINTENANCE & TROUBLE SHOOTING V & WEDGE BELT DRIVES LlNK BELT DRIVES RIBBED BELT DRIVES PAGE 99/115 POLY V RIBBED BELT DRIVES PJ, PK, PL & PM SECTIONS PAGE 108 BELT DRIVES Friction Belt Drives Design Data Required • Type of prime mover, or driving m/c • Electric motor starting arrangement • Rotational speed of prime mover • Power rating of prime mover • Type of driven machine • Rotational speed of driven machine • Power absorbed by driven machine • Hours/day duty & start/stop frequency • Both driven & driving machine shaft diameters • Centre distance fixed centres? adjustment? • Space restraints • Any environmental issues ambient temperature water, oil mist, solvents etc. Friction Belt Drives 57
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FRICTION BELT DRIVES
Fenner friction belt drives have set the pace forover a century and will continue to do so.
Our comprehensive range of products combinesstate-of-the-art belt materials and manufacturingmethods, with optimised Taper-Lock® pulleydesigns and conformity to all ISO and otherindustry standards, to give a cost-effective solutionto any friction belt transmission requirement.
Fenner Power Transmission Distributors alsosupport the range with unrivalled experience in theapplication of friction belt drive systems.
CLASSIC PB V-BELTS
Z, A, B, C & D SECTIONSTO ISO, BS & RMA STANDARDSANTI-STATIC
PAGE 59
POWER PLUS PB
& WEDGE BELTS
SPZ, SPA, SPB, SPC SECTIONS, TO ISO,BS & RMA STANDARDSANTI-STATIC
PAGE 60
TAPER-LOCK® V PULLEYS
OPTIMISED TAPER LOCK DESIGNDUAL DUTY GROOVESTO ISO & BS STANDARDS
PAGE 80
BANDED & LINK BELTING
BANDED V & WEDGE BELTSBANDED FIT ISO OR RMA PULLEYSRIVET-LESS POWERTWISTLINK BELTS
PAGE 93
VARIABLE SPEED
BELTS/PULLEYS
PAGE 97
INSTALLATION & MAINTENANCE
& TROUBLE SHOOTING
V & WEDGE BELT DRIVESLlNK BELT DRIVESRIBBED BELT DRIVES
PAGE 99/115
POLY V RIBBED BELT DRIVES
PJ, PK, PL & PM SECTIONSPAGE 108
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SFriction Belt Drives
Design Data Required
• Type of prime mover, or driving m/c
• Electric motor starting arrangement
• Rotational speed of prime mover
• Power rating of prime mover
• Type of driven machine
• Rotational speed of driven machine
• Power absorbed by driven machine
• Hours/day duty & start/stop frequency
• Both driven & driving machine shaft
diameters
• Centre distance
fixed centres?
adjustment?
• Space restraints
• Any environmental issues
ambient temperature
water, oil mist, solvents etc.
Friction Belt Drives 57
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Belt Drives
The ultimate in rubbersynchronous belts - Page 117
BELT DESIGNATION
All belt designations denote pitch length in millimetresi.e. SPZ, SPA, SPB, SPC and Delta.
Although the cross sections are identical, somemanufacturers use other designations viz:SPZ is interchangeable with Alpha, 3V and 9NSPB is interchangeable with Beta, 5V and 15NDelta is interchangeable with SPP, 8V and 25N
Special conditions apply to BANDED BELTS
New High Power Belt Drives From
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V-Belts
ISO4184 – DIN2215 – BS3790 – RMA IP20
Fenner Classic V-Belts have specially treated jackets to give superior anti-static, heat and oil-resistant properties.All Fenner Classic V-Belts are static conductive to ISO1813, will not self-ignite under severe slip/stall conditions.
10 x 6(Z)
* Non standard size available on request.
13 x 8(A)
Pitch Length
mm
Pitch Length
mm
Inside Length
inches
17 x 11(B)
Pitch Length
mm
Inside Length
inches
22 x 14(C)
Pitch Length
mm
Inside Length
inches
32 x 19(D)
Pitch Length
mm
Inside Length
inches
*370*395*410*445*470
*480*495*510*520530
*545560
*580*600610
*620630
*650660680
*700*725730750760
780800810840
*850
860875890900910
920940950960
*965
980990
101010401060
10801090
*1105*11301140
*11551170119012051220
1240127012901320
*1330
13401370
*138013901420
14501470
*1540*1750
620650670700720
750770800820850
870900920950980
1 0001 0301 0501 0801 100
1 1301 1501 1801 2001 230
1 2501 2801 3101 3301 360
1 3801 4101 4301 4601 480
1 5101 5301 5601 5801 610
1 6401 6601 6901 710
*1 740
1 7601 810
*1 832*1 8401 860
*1 890*1 9101 940
*1 960*1 990
2 0202 0702 120
*2 1702 190
*2 2502 320
*2 350*2 370*2 400
*2 4502 470
*2 5202 580
*2 630
2 700*2 730*2 750*2 820*2 860
2 8803 080
*3 1903 2903 410
3 4903 6904 430
2324252627
2829303132
3334353637
3839404142
4344454647
4849505152
5354555657
5859606162
6364656667
6870
7172
73
747576
7880828485
8790919293
96
100102
105106107110111
112120
128133
136144173
810880930960
1 010
*1 0301 060
*1 0801 110
*1 140
*1 1501 160
*1 1901 2101 260
*1 2701 3101 3401 3601 390
1 4101 4401 4701 4901 520
*1 5501 570
*1 5901 620
*1 640
1 6701 6901 720
*1 7401 770
1 8201 8501 870
*1 900*1 925
1 950*1 970*2 0002 0202 050
*2 0702 0802 1002 150
*2 180
2 200*2 2302 250
*2 3002 330
2 3502 4102 460
*2 4802 510
2 530*2 5602 580
*2 6302 710
2 790*2 840*2 8702 8902 960
3 0403 090
*3 1403 1903 290
*3 4503 5003 700
*3 730*3 790
4 060*4 260*4 4104 440
*4 510
4 6204 8705 000
*5 2505 380
6 0906 8507 610
3033353638
3940414243
4344454648
4850515253
5455565758
5960616263
6465666768
7071727374
7576777879
8080818384
8586878990
9193959697
9899
100102105
108110111112115
118120122124128
134136144145147
158166172173176
180190195205210
238268298
1 3501 4501 580
*1 6301 660
1 7801 9602 0102 060
*2 090
2 1102 1602 2102 2902 340
*2 3902 420
*2 4402 490
*2 520
2 5502 6002 7202 9003 050
3 1003 2103 3103 5103 710
4 0704 1704 3204 4504 500
*4 6004 6305 0105 390
*5 730
5 7706 100
*6 1506 8607 630
8 3909 150
10 670
5155606263
6875777980
8183858890
9293949697
98100105112118
120124128136144
158162168173175
179180195210223
225238240268293
328358418
3 1303 3303 5403 7404 090
4 2004 4804 6505 0305 420
6 1306 8907 650
*8 0008 060
8 4109 170
10 70012 220
120128136144158
162173180195210
238268298312314
328358418478
WORKING TEMPERATURES
Fenner V-belts performsatisfactorily within thetemperature range -40oC to
70oC.
Mass per unit length
10 x 6 (Z)13 x 8 (A)17 x 11 (B)22 x 14 (C)32 x 19 (D)
kg/m
0.0550.0940.1630.2840.560
Pitch length exceedsinside length by
10 x 6 (Z)13 x 8 (A)17 x 11 (B)22 x 14 (C)32 x 19 (D)38 X 23 (E)
mm
253343628292
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R Wedge Belts
ISO4184 – DIN7753 – BS3790 – RMA IP22
In addition to their precision-built qualities, Fenner Power Plus Wedge Belts have superior anti-static and oil-resistant properties.
All Fenner Power Plus Wedge belts are static conductive to ISO1813, will not self-ignite under severe slip/stall conditions.
Fenner Wedge Belts performsatisfactorily within thetemperature range -40oC to
70oC.
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Notes
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Selection–Wedge Belt Drives
(a) Speed RatioCalculate Speed Ratio by dividing the rev/min of the faster shaft bythe rev/min of the slower shaft.(b) Service FactorFrom Table 3 (page 63), select the Service Factor which is applicableto the drive. If the drive is speed increasing, an additional factormay be required – refer to top of Table 3.(c) Design PowerMultiply the normal running power or prime mover power by theService Factor. This gives the Design Power which is used as thebasis for selecting the drive.(d) Belt Section & TypeRefer to Table 2 (opposite) and trace to the right along the horizontalaxis to the rev/min of the faster shaft. Trace upwards along thevertical axis to the Design Power. Choose the belt section and typerepresented by the area in which the point of intersection falls.(e) Minimum Pulley DiameterRefer to Table 1 (below) and select the minimum recommendedpulley, using the Design Power from step (c) and the faster shaftspeed. This is a guide to the minimum pulley pitch diameter capableof transmitting the design power at the given speed,withoutgenerating excessive bearing loads.(f) Pulley Pitch DiametersRefer to the drive selection tables on pages 64 to 75 and for thebelt section chosen read down the speed ratio column to the valuenearest the calculated speed ratio. Use the Minimum PulleyDiameter from step (e) as a guide to the small pulley selection.(g) Belt Length, Centre Distance and Correction FactorThe drive tables list ISO belt lengths.Along the same line as the chosen Speed Ratio read across thetable to find a suitable Centre Distance. The required Belt Length isgiven at the head of the column.Note the Correction Factor by following the chosen centre distanceto the top of the table.If the Centre Distance is not specified consider a drive with acentre distance approximately equal to the sum of the pulleypitch diameters.When non-standard pulleys or belts are used the Centre Distanceand Belt Length can be calculated using the formulae given on pageii of the technical information section. Interpolate from the tablesfor the Correction Factor.(h) Basic Power per BeltRefer to the power rating tables (pages 76 to 79) for the sectionand type of wedge belt chosen (or pages 88 to 92 for other types ofbelts). In the left-hand column locate rev/min of the faster shaft, i.e.the one with the small pulley. Read across to the column headed bythe pitch diameter of the small pulley and note the rated power.Note that Fenner pulleys are designed for belt speeds up to 40m/s. If using non-Fenner pulleys seek manufacturer's approvalat high speeds.
N.B. The powers listed in the columns headed by the motor speedsin the Drive Tables (pages 64 to 75) give the power per belt includingSpeed Ratio Increment, step (j), for Power Plus wedge belts.These powers require correcting for belt length and arc of contact(Correction Factor) (g) and should be used in conjunction with theappropriate Service Factor.
(j) Speed Ratio Power IncrementFrom the power rating tables (pages 76 to 79) note the additionalpower per belt for the Speed Ratio being used.This value is the same for all types of belt of a given section.(k) Corrected Power per BeltAdd the Speed Ratio Power increment (j) to the Basic Power perBelt (h) and multiply by the Correction Factor from step (g).(l) Number of Belts requiredDivide the Design Power from step (c) by the Corrected Power perBelt (k). The result gives the number of belts required. If the answercontains a fraction use the next whole number.(m) Bore sizesCheck that the pulleys will fit shafts by referring to the pulleydimension tables (pages 80 to 87).
Speed *Minimum Pulley Diameter (mm)of faster Design Power (kW)
* This table is intended as a guide to selection only. Bearing loads should be carefully considered when using small pulleys on electric motors.
REV/MIN OF FASTER SHAFT
TABLE 2
TABLE 1
DE
SIG
N P
OW
ER
kW
1,000
100
10
1
800
600500400
300
200
80
605040
30
20
8
654
3
2
1,000100 200
300
400
500
600
800
2,00
0
3,00
0
4,00
05,
000
6,00
0
SPC
SPB
SPA
SPZ
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Selection–Wedge Belt Drives
TABLE 3: SERVICE FACTORS
Electric motors: Electric motors:AC – Star Delta start AC – Direct-on-line startDC – Shunt wound DC – Series & compound wound
Internal combustion engines with 4 or more Internal combustion enginescylinders with less than 4 cylindersPrime movers fitted with centrifugal Prime movers not fitted with soft startclutches, dry or fluid couplings or deviceselectronic soft start devices
Hours per day duty
SPEED INCREASE RATIO TYPES OF PRIME MOVER
'Soft' starts 'Heavy' starts
For speed increasing drives of:Speed ratio 1,00 – 1,24 multiply service factor by 1,00Speed ratio 1,25 – 1,74 multiply service factor by 1,05Speed ratio 1,75 – 2,49 multiply service factor by 1,11Speed ratio 2,50 – 3,49 multiply service factor by 1,18Speed ratio 3,50 and over multiply service factor by 1,25
TYPES OF DRIVEN MACHINE 10 and Over 10Over 16
10 and Over 10Over 16under to 16 under to 16
Class 1 Blowers, exhausters and fans (up to 7,5 kW), 1,0 1,1 1,2 1,1 1,2 1,3Light centrifugal compressors and pumps. Belt conveyorsDuty (uniformly loaded).
Class 2 Agitators (uniform density), blowers, 1,1 1,2 1,3 1,2 1,3 1,4Medium exhausters and fans (over 7.5 kW). Rotary
From the power rating table (page 78) by interpolation the rated power/belt for a 315 mm pitch diameter pulley at 1050 rev/min is 18,86 kWfor Power Plus SPB.(j) Speed Ratio Power Increment
The power increment (by interpolation) for a speed ratio of 1,59 at1050 rev/min is 0,77 kW. (page 78)(k) Corrected Power per Belt
= (18,86 + 0,77) x 1,05= 20,61 kW per belt.
(l) Number of Belts required
= 70 = 3,4 i.e use 4 SPB Power Plus wedge belts.20,61
(m) Bore Sizes
From pulley dimension tables, a 315mm x 4 SPB has a bush size3525 with 100 mm max. bore.It will fit the 70 mm dia. engine shaft.500 mm or 4 SPB pulley, which have a bush size 3525, will fit the80 mm dia. compressor shaft.DRIVE SPECIFICATION
Power Plus SPBEngine pulley 315 x 4SPBTaper Lock bush 3525/70 mmCompressor pulley 500 x 4SPBTaper Lock bush 3525/80 mm
4 x SPB 4560 wedge belts give 1638 mm centres.
SPECIAL NOTESThe following factors should be carefully considered during actualdrive selection.
(1) Trip Rate
Check the trip rate on all drives. As a guide on drives with ratioslarger than 1,3 : 1 the maximum recommended trip rate should notexceed 12. On lower ratios the trip rate should not exceed 6/8 trips/second.
Trip rate = 0,0524 x small pulley p.d in mm x r/min of fast shaft
Length of belt in mm
EXAMPLEDesign a wedge belt drive from a 50 kW 6 cylinder diesel enginewhich runs at 1050 rev/min to a reciprocating compressor runningat 660 rev/min. The centre distance is to be approximately 1600mm and the duty is 24 hours/day. The engine shaft is 70 mmdiameter and the compressor shaft 80 mm diameter.(a) Speed Ratio
Speed ratio = 1050 = 1,59:1660
(b) Service Factor
From Table 3 the service factor is 1,4.(c) Design Power
50 x 1,4 = 70 kW(d) Belt Section
By referring to Table 2 the intersection of design power and thespeed of the faster shaft indicates SPB section.(e) Minimum Pulley
From Table 1 (page 62) the minimum recommended pulley isapproximately 236 mm.(f) Pulley Pitch Diameters
By referring to the centre distance tables relating to SPB sectionbelts on page 71 the selection is a driving pulley of 315 mm pitchdiameter and a driven pulley of 500 mm pitch diameter.(g) Belt Length, Centre Distance and Correction Factor
Reading across the table, the nearest centre distance to the 1600 mmrequired is 1638 mm. The belt length at the head of the column is4560. By following the table, a correction factor of 1,05 is noted.
(2) On 1:1 drives it is recommended in most instances that pulleysabove minimum for the belt section are used.
(3) Flywheel Pulleys
When supplying pulleys for reciprocating compressors ensure thatthe pulley inertia conforms to the suppliers specification.
(4) Pulsating Loads
If severely pulsating loads are present in the drive, banded beltsmay be advisable - consult Fenner Power Transmission Distributor.
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BELT LENGTH
Centre Distance SPZ Wedge Belt Drives
–599
592584577569561
553534514490
557565595573
–
580
588474565547
573595587
580551569533
512576584591
486458537555
572580587
541559521576
583590442470545525579
563529
549566
505
453480533
552569509536
555513463
400489559540
516492543
520496
––
642632627619611
603584564540
607615645623
–
630
638524615597
623–
638
630601619583
562626634641
536508587605
622630637
591609571626
633–
492520595575629
613579
599616
555
503530583
602619559587
606563513
450539609590
566542593
570546
565559
552544537529521
513494474450
517525555533562
540
548434525507
533555547
540511529493
472536544551
446418497515
532540547
501519481536
543550402430505485539
523489
509526
465
413439493
512529469496
515472423
360448518500
476452503
480456
435429
422414407399391
383364
––
387395425403432
410
414–
395377
403425417
410381399363
342406414421
316288367385
402410417
371389351406
413326271299375355409
393359
378396
335
282309362
382399338366
385342292
227318388370
346321373
349325
––
––––
776
768749729705
772780
–––
–
–689
–762
–––
–766
–748
727–––
701674752770
–––
756–
736–
––
657685760740
–
–744
764–
720
669695748
––
724752
–728679
616704
–756
732708
–
736712
––
––––
801
793774754730
797––––
–
–714
–787
–––
–791
–773
752–––
726699777795
–––
781–
761–
––
682710785765
–
–769
––
745
694720773
––
749777
–753704
641729
–781
757733
–
761737
––
–––––
858839819795
–––––
–
–779
–852
–––
–––
838
817–––
791764842
–
–––
846–
826–
––
747775850830
–
–834
––
810
759785538
––
814–
–818769
707794
––
822798
–
526502
––
–––––
–899879855
–––––
–
–839
––
–––
–––
898
877–––
851824902
–
–––
––
886–
––
808835
–890
–
–894
––
870
819845
–
––
874–
–878829
767854
––
–858
–
–562
––
–––––
–964944920
–––––
–
–904
––
–––
––––
942–––
916889
––
–––
––
951–
––
873900
–––
––
––
935
884910
–
––
939–
–943894
932919
––
–923
–
–927
16701663
16571649164116341626
1618159915791555
16221630166016381667
1645
1649153916301612
163816601652
1645161616341598
1577164116491656
1551152416021620
163816451652
1606162415861641
1648156115081535161015901644
16281594
16141631
The above drives are based on the ISO belt length designations, other belt lengths and pulley combinations are available - consult Fenner Power Transmission Distributor.All dimensions in millimetres. On all drives check trip rate. As a guide on drives with ratios up to 1,3 a maximum recommended trip rate should not exceed 6/8 persecond. On higher ratios the trip rate should not exceed 12 trips per second.
The above drives are based on the ISO belt length designations, other belt lengths and pulley combinations are available - consult Fenner Power Transmission Distributor.All dimensions in millimetres. On all drives check trip rate. As a guide on drives with ratios up to 1,3 a maximum recommended trip rate should not exceed 6/8 persecond. On higher ratios the trip rate should not exceed 12 trips per second.
The above drives are based on the ISO belt length designations, other belt lengths and pulley combinations are available - consult Fenner Power Transmission Distributor.All dimensions in millimetres. On all drives check trip rate. As a guide on drives with ratios up to 1,3 a maximum recommended trip rate should not exceed 6/8 persecond. On higher ratios the trip rate should not exceed 12 trips per second.
–398456402
327–
330
405333408
–336411340
–343
–345
–348
–
––––
309490546494
420318424
497427500
–431503434
334437337440
340443343
346–––
484657712660
589494593
664596667
502600670603
510607514610
517613520
524528529532
510682737686
615520618
689622692
528625695629
537632540635
543638547
550553556558
576747803751
681587684
755688758
596691761695
604699607710
611704614
617621623626
638808
–811
741648745
815749818
657752821756
666759669762
672765676
679683685688
704873
–877
807715811
881814883
724818886822
732825736828
739831743
746749752755
–264324267
–––
271–
273
––
276–
––––
–––
––––
–439496443
369–
372
446375449
–379452382
–385
–388
–390
–
289–––
Combined Arc and Belt Length
0,90 0,95 1,00 1,05 1,10Correction Factor
Pitch Diameter Power per SPZSpeed of Pulleys Belt (kW)Ratio 1440 2880
The above drives are based on the ISO belt length designations, other belt lengths and pulley combinations are available - consult Fenner Power Transmission Distributor.All dimensions in millimetres. * V-Belt drives only. On all drives check trip rate. As a guide on drives with ratios up to 1,3 a maximum recommended trip rate should notexceed 6/8 per second. On higher ratios the trip rate should not exceed 12 trips per second.
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Centre Distance SPA Wedge Belt Drives
The above drives are based on the ISO belt length designations, other belt lengths and pulley combinations are available - consult Fenner Power Transmission Distributor.All dimensions in millimetres. * V-Belt drives only. On all drives check trip rate. As a guide on drives with ratios up to 1,3 a maximum recommended trip rate should notexceed 6/8 per second. On higher ratios the trip rate should not exceed 12 trips per second.
The above drives are based on the ISO belt length designations, other belt lengths and pulley combinations are available - consult Fenner Power Transmission Distributor.All dimensions in millimetres. * V-Belt drives only. On all drives check trip rate. As a guide on drives with ratios up to 1,3 a maximum recommended trip rate should notexceed 6/8 per second. On higher ratios the trip rate should not exceed 12 trips per second.
Combined Arc and Belt Length
0,80 0,85 0,900,95 1,00 1,05Correction Factor
Pitch Diameter Power per SPASpeed of Pulleys Belt (kW)Ratio 1440 2880
The above drives are based on the ISO belt length designations, other belt lengths and pulley combinations are available - consult Fenner Power Transmission Distributor.All dimensions in millimetres. On all drives check trip rate. As a guide on drives with ratios up to 1,3 a maximum recommended trip rate should not exceed 6/8 persecond. On higher ratios the trip rate should not exceed 12 trips per second.
140150160
170180
190200
212224236
250280
315190224
180
212170236
200
160
150140180
212
190224170
200250
160280315
150140
170180190
212200
236160
150140190
180170
160200224
250
150280315
140
180
190170212
160
150236140
170180
160200224
150250
140280
170190160
140150160
170180
190200
212224236
250280
315200236
190
224180250
212
170
160150200
236
212250190
224280
180315355
170160
200212224
250236
280190
180170236
224212
200250280
315
190355400
180
236
250224280
212
200315190
236250
224280315
212355
200400
250280236
6,887,959,00
10,0511,08
12,1013,1114,3015,4716,63
17,9620,7023,7512,2015,57
11,3614,5810,3316,9113,39
9,288,237,16
11,3614,58
12,5915,9710,5413,6018,45
9,4921,2024,24
8,447,37
10,5411,5712,5914,7913,78
17,309,678,617,55
12,77
11,7510,72
9,6713,7816,14
18,628,76
21,5124,56
7,69
11,8912,9110,8615,11
9,81
8,7617,44
7,6911,0012,03
9,9514,0616,42
8,9018,90
7,8321,6511,0013,05
9,95
5,005,756,507,247,98
8,719,43
10,2911,1511,99
12,9715,0317,37
8,7811,22
8,1610,48
7,4312,18
9,62
6,695,945,198,17
10,48
9,0311,47
7,579,76
13,30
6,8315,3617,70
6,085,33
7,578,309,03
10,629,88
12,446,956,206,459,15
8,427,696,959,88
11,59
13,416,29
15,5717,91
5,54
8,529,257,78
10,837,04
6,2912,53
5,547,878,61
7,1310,0611,78
6,3913,60
5,6315,67
7,879,347,13
–––––
–––––
–––––
–––––
–––
332278
314258347297
–
363––
379394
339322305267287
–355371386295
312329347276
–
184363
––
378
302283320
–337
354–
370310290
327––
344–
36271
298257317
485470
–––
–––––
–––––
–––––
–462477407353
389333422372289
438––
454469
414397380342362
299430446461370
387405422351308
259438
––
453
377358395317412
430–
445385366
402326
–420
–
437160373333392
680665649633617
602––––
–––
594–
––
625––
641657672602548
584528617567484
633433374649664
609592575537557
494625641656565
582600617546504
455633400
–648
573554590513607
625466640580561
598522475615422
632361569529588
790775759743727
712696677658
–
–––
704–
720668735
–687
751767782712658
694638727677594
743543484759774
719702685647667
605735751767675
693710727656614
566743510447759
683664700623718
735576751691672
708632585725532
742472679639698
855840824808792
777761742723
–
–––
769714
785733800
–752
816832847777723
759703792742659
808608549824839
784767750712733
670800816832740
758775792721679
631808575512824
748729765688783
800641816756737
773697650790598
808538744705763
920905889873857
842826807788769
–––
834779
850798865758817
881897912842788
824768857807724
873673614889904
849832815777798
735865881897805
823840857786744
696873640577889
813794830753848
865706881821802
838762715855663
873603809770828
980965949933917
902886867848829
808––
894839
910858925818877
941957972902848
884828917867784
933733674949964
909892875837858
795925941957865
883900917846804
756933701637949
873854890813908
925766941881862
898822776915723
933663869830888
1260124412281212
11971181116211431124
11031055100011891134
12051153122011131172
12361252126711971143
11791123121211621079
12281028
96912441259
12041187117011321153
10901220123612521160
11781195121211411099
10511228
996933
1244
11681149118511081203
12201062123611761157
11931117107112101019
1228959
116511251184
–––
15081492
14771461144214231404
13831335128014691414
14851433150013931452
–––
14771423
14591403149214421359
–13081249
––
14841467145014121433
13701500
––
1440
14581475149214221379
1331–
12761213
–
14481429146513881483
–1342
–14561437
147313981351
–1299
–1240144514051464
––––
1617
16021586156715481529
15081460140515941539
16101558
–15181577
–––
16021548
15841528
–15671484
–14331374
––
–1592157515371558
1495–––
1565
15831600
–15471504
1456–
14011338
–
1573155415901513
–
–1467
–15811562
159815231476
–1424
–1365157015301589
–––––
–1716169716781659
16381590153517241669
–1688
–16481707
––––
1678
17141658
–16971614
–15631504
––
––
170516671688
1625–––
1695
–––
16771634
1586–
15311468
–
17031684
–1643
–
–1597
––
1692
–16531606
–1554
–149517001660
–
–––––
––
182218031784
176317151660
–1794
–1813
–17731832
––––
1803
–1783
–18221739
–16881629
––
–––
17921813
1750––––
–––
18021759
1711–
16561593
–
–1809
–1768
–
–1722
–––
–17781731
–1679
–1620
–1785
–
–––––
–––
19281909
188818401785
–1919
–1938
–1898
–
––––
1928
–1908
––
1864
–18131754
––
–––
1917–
1875––––
––––
1884
1836–
17811718
–
–––
1893–
–1847
–––
–19031856
–1804
–1745
–––
–––––
––––
2039
201819701915
––
–––
2028–
–––––
–2038
––
1994
–19431884
––
–––––
2005––––
––––
2014
1966–
19111848
–
–––
2023–
–1977
–––
––
1986–
1934
–1875
–––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––
2988–
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
–––––
1,001,001,001,001,00
1,001,001,001,001,00
1,001,001,001,051,05
1,061,061,061,061,06
1,061,071,071,111,11
1,121,121,121,121,12
1,131,131,131,131,14
1,181,181,181,181,18
1,191,191,201,211,24
1,241,251,251,251,25
1,261,271,271,271,29
1,311,321,321,321,33
1,331,331,361,391,39
1,401,401,411,411,42
1,431,431,471,471,48
1,001,001,001,001,00
1,001,001,001,001,00
1,001,001,001,051,05
1,061,061,061,061,06
1,061,071,071,111,11
1,121,121,121,121,12
1,131,131,131,131,14
1,181,181,181,181,18
1,191,191,201,211,24
1,241,251,251,251,25
1,261,271,271,271,29
1,311,321,321,321,33
1,331,331,361,391,39
1,401,401,411,411,42
1,431,431,471,471,48
Combined Arc and Belt Length
0,85 0,90 0,95 1,00 1,05 1,15Correction Factor
Pitch Diameter Power per SPBSpeed of Pulleys Belt (kW)Ratio 1440 960
The above drives are based on the ISO belt length designations, other belt lengths and pulley combinations are available - consult Fenner Power Transmission Distributor.All dimensions in millimetres. On all drives check trip rate. As a guide on drives with ratios up to 1,3 a maximum recommended trip rate should not exceed 6/8 persecond. On higher ratios the trip rate should not exceed 12 trips per second.
The above drives are based on the ISO belt length designations, other belt lengths and pulley combinations are available - consult Fenner Power Transmission Distributor.All dimensions in millimetres. On all drives check trip rate. As a guide on drives with ratios up to 1,3 a maximum recommended trip rate should not exceed 6/8 persecond. On higher ratios the trip rate should not exceed 12 trips per second.
Combined Arc and Belt Length
0,8 0,85 0,9 0,95 1,05Correction Factor
Pitch Diameter Power per SPBSpeed of Pulleys Belt (kW)Ratio 1440 960
The above drives are based on the ISO belt length designations, other belt lengths and pulley combinations are available - consult Fenner Power Transmission Distributor.All dimensions in millimetres. On all drives check trip rate. As a guide on drives with ratios up to 1,3 a maximum recommended trip rate should not exceed 6/8 persecond. On higher ratios the trip rate should not exceed 12 trips per second.
The above drives are based on the ISO belt length designations, other belt lengths and pulley combinations are available - consult Fenner Power Transmission Distributor.All dimensions in millimetres. On all drives check trip rate. As a guide on drives with ratios up to 1,3 a maximum recommended trip rate should not exceed 6/8 persecond. On higher ratios the trip rate should not exceed 12 trips per second.
1,00 1,02 1,06 1,12 1,19 1,27 1,39 1,58 1,95 3,39to to to to to to to to to and
1,01 1,05 1,11 1,18 1,26 1,38 1,57 1,94 3,38 over
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Pitch No. of Bush Max. Bore PulleyF J K L M N
Outside Dia (P) Grooves No. Metric Inch Type Dia (O)
67 1 1108 28 11/8 1 16 – – 22 6 60 71
67 2 1108 28 11/8 6 28 42 6 22 – – 71
67 3 1108 28 11/8 6 40 42 18 22 – – 71
71 1 1108 28 11/8 1 16 – – 22 6 60 75
71 2 1108 28 11/8 6 28 42 6 22 – – 75
71 3 1108 28 11/8 6 40 42 18 22 – – 75
75 1 1108 28 11/8 1 16 – – 22 6 60 79
75 2 1210 32 11/4 6 28 51 3 25 – – 79
75 3 1210 32 11/4 6 40 51 15 25 – – 79
80 1 1210 32 11/4 1 16 – – 25 9 75 84
80 2 1210 32 11/4 6 28 51 3 25 – – 84
80 3 1210 32 11/4 6 40 51 15 25 – – 84
80 4 1210 32 11/4 6 52 51 27 25 – – 84
85 1 1210 32 11/4 1 16 – – 25 9 80 89
85 2 1610 42 15/8 6 28 60 3 25 – – 89
85 3 1610 42 15/8 6 40 60 15 25 – – 89
85 4 1610 42 15/8 6 52 60 27 25 – – 89
*85 5 1610 42 15/8 6 64 60 39 25 – – 89
90 1 1210 32 11/4 1 16 – – 25 9 80 94
90 2 1610 42 15/8 6 28 61 3 25 – – 94
90 3 1610 42 15/8 6 40 61 15 25 – – 94
90 4 1610 42 15/8 6 52 61 27 25 – – 94
95 1 1210 32 11/4 1 16 – – 25 9 85 99
95 2 1610 42 15/8 6 28 66 3 25 – – 99
95 3 1610 42 15/8 6 40 66 15 25 – – 99
95 4 1610 42 15/8 6 52 66 27 25 – – 99
*95 5 1610 42 15/8 6 64 66 39 25 – – 99
100 1 1210 32 11/4 1 16 – – 25 9 85 104
100 2 1610 42 15/8 6 28 71 3 25 – – 104
100 3 1610 42 15/8 6 40 71 15 25 – – 104
100 4 1610 42 15/8 6 52 71 27 25 – – 104
112 1 1610 42 15/8 1 16 – – 25 9 92 116
112 2 1610 42 15/8 6 28 83 3 25 – – 116
112 3 2012 50 2 6 40 83 8 32 – – 116
112 4 2012 50 2 6 52 83 20 32 – – 116
*112 5 2012 50 2 6 64 83 32 32 – – 116
Type 6NR pulleys are made to catalogue dimensions, but modern manufacturing techniques result in there being no recess behind the Taper Lock bush, theJ dimension is then approximately equal to the small diameter of the Taper Lock bush.Dimensions in millimetres unless otherwise stated. * Non-preferred pulley sizes.All envelope and prime functional dimensions are correct at the time of going to publication. Non-functional dimensions may vary slightly.
Taper-Lock® Pulleys for Z & SPZ Belts
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Pitch No. of Bush Max. Bore PulleyF J K L M N
Outside Dia (P) Grooves No. Metric Inch Type Dia (O)
Dimensions in millimetres unless otherwise stated.* Non-preferred pulley sizes.All envelope and prime functional dimensions are correct at the time of publication. Non-functional dimensions may vary slightly.
Taper-Lock® Pulleys for Z & SPZ Belts
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Taper-Lock® Pulleys for A & SPA Belts
Pitch No. of Bush Max. Bore PulleyF J K L M N
Outside Dia (P) Grooves No. Metric Inch Type Dia (O)
Dimensions in millimetres unless otherwise stated. * Non-preferred pulley sizes.All envelope and prime functional dimensions are correct at the time of going to publication.Non-functional dimensions may vary slightly.✝ A-Section belts only.
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Taper-Lock® Pulleys for A & SPA Belts
Pitch No. of Bush Max. Bore PulleyF J K L M N
Outside Dia (P) Grooves No. Metric Inch Type Dia (O)
Dimensions in millimetres unless otherwise stated.* Non-preferred pulley sizes.All envelope and prime functional dimensions are correct at the time of publication. Non-functional dimensions may vary slightly.
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Taper-Lock® Pulleys for B & SPB Belts
Pitch No. of Bush Max. Bore PulleyF J K L M N
Outside Dia (P) Grooves No. Metric Inch Type Dia (O)
Dimensions in millimetres unless otherwise stated. * Non-preferred pulley sizes.All envelope and prime functional dimensions are correct at the time of going to publication.Non-functional dimensions may vary slightly.✝ B-Section belts only.
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Taper-Lock® Pulleys for B & SPB Belts
Dimensions in millimetres unless otherwise stated.* Non-preferred pulley sizes.All envelope and prime functional dimensions are correct at the time of publication. Non-functional dimensions may vary slightly.
Pitch No. of Bush Max. Bore PulleyF J K L M N
Outside Dia (P) Grooves No. Metric Inch Type Dia (O)
Dimensions in millimetres unless otherwise stated.* Non-preferred pulley sizes.All envelope and prime functional dimensions are correct at the time of publication.Non-functional dimensions may vary slightly.
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Taper-Lock® Pulleys for C & SPC Belts
Pitch No. of Bush Max. Bore PulleyF J K L M N
Outside Dia (P) Grooves No. Metric Inch Type Dia (O)
Dimensions in millimetres unless otherwise stated.* Non-preferred pulley sizes.All envelope and prime functional dimensions are correct at the time of publication. Non-functional dimensions may vary slightly.
AO D e* f b lp W RBelt Pulley ± 0,5O +0,03 ± 0,15 ± 0,3 ± 0,13 NOM
Section PCD -0,0
SPZ Up to 80 34 11,0 12 8 2,0 8,5 9,7 17,25Dual Groove Over 80 38 9,9
SPA Up to 118 34 13,75 15 10 2,75 11 12,7 21,25Dual Groove Over 118 38 12,9
SPB Up to 190 34 17,5 19 12,5 3,5 14 16,1 27,25Dual Groove Over 190 38 16,4
SPC Up to 315 34 23,8 25,5 17 4,8 19 21,9 37,25Dual Groove Over 315 38 22,3
*e dimension – the tolerance shown is between any two grooves.
1,00 1,02 1,06 1,12 1,19 1,27 1,39 1,58 1,95 3,39to to to to to to to to to and
1,01 1,05 1,11 1,18 1,26 1,38 1,57 1,94 3,38 over
ADDITIONAL POWER (kW) PER BELT FOR SPEED RATIO OFRev/minof faster
shaft
POWER RATING IN KILOWATTS (kW) FOR PULLEY OUTSIDE DIAMETERS (mm)Rev/minof faster
shaft
Non Standard Power Ratings for 25N Section Belts
Pulley diameters used for 25N pulleys are based on outside diameters and not on pitch diameters.
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Fenner Concord Plus Banded Belts
■ Eliminate belt whip, belt twist and beltturn over
■ Ideal for drives with pulsating loads
■ Available for ISO and RMA pulleys
■ Heat and oil resistant
On applications where pulsating or shockloads cause instability in matched sets ofWedge or V-belts, Fenner Banded belts canprovide the ideal solution.By joining together a number of belts with atie band the banded belt has sufficient lateralrigidity to eliminate problems caused by beltswhipping or turning over, and by keeping thebelts running into the grooves in a straightline excessive jacket wear is avoidedresulting in longer belt life.Fenner Banded belts can be used in FennerTaper-Lock pulleys manufactured to ISOstandards but they are also available for RMAprofile pulleys.When ordering Banded belts it is important
that the correct groove profile is selected.
The groove spacing i.e. dimension 'e' is
given in the following table - Figure 1.
SELECTION
(a) Determine whether any pulsating loadswill be present in the drive, which wouldcause excessive vibration.
(b) Using the wedge belt selectionprocedure, page 62, select the numberand size of belts and sizes of pulleys tosuit the particular drive*.
(c) Select a banded belt length from page94 nearest to the length found in step(b).
*RMA wedge belts and HA section V-beltsare only intended for replacement purposes.New drives should be designed using ISOwedge or classical section belts.
If the exact length is not listed opposite,re-calculate the centre distance using theformula below:-
C = A + A2 – B
where A = L – 0,3925 (D+d)4
B = (D – d)2
8
C = centre distance in mmD = pitch diameter of larger pulley in mmd = pitch diameter of smaller pulley in mmL = pitch length of belt in mm
It is normal practice to use no more than fivebelts in one band. Accumulation ofmanufacturing tolerances on pulley groovepitch (dimension 'e') can result in incorrectbelt seating when more than 5 belts are usedin a single band.
Therefore when more than 5 belts areneeded use two or more bands e.g.:-
6 belts - use 2 bands of 38 belts - use 2 bands of 49 belts - use 1 band of 4 and 1 band of 5
ORDERING INSTRUCTIONS
When ordering Banded Belts it is importantto state the number of belts per band; thesection and the belt length as follows:-
Banded 4 9J 2840 is 4 Banded 9J 2840Banded 5 SPB 3170 is 5 Banded SPB 3170Banded 2 C 3100 is 2 Banded C 3100
Note1) Pulleys and belts defined as ISO conformexactly to BS 3790:1981.2) RMA denotes Rubber ManufacturersAssociation of America standards and oftenapplies to agricultural machinery.
Low Stretch Version
Fenner Concord banded belts up to SPB /15J section can be supplied with aramidcords, to minimise stretch.
Tensioning
Banded belts should be installed with thesame tension as for Power Plus wedge belts(page 99).The Fenner spring plunger belt tensionindicator can be used, as for individual beltsbut with the same setting force multipliedby the number of belts in a band (2, 3, 4 or5).A piece of rigid bar placed across the bandwidth can ensure even deflection of all beltsin the band.
Figure 1
Belt section Pulley types e (mm)
SPZ ISO 12,0SPA standard 15,0SPB only 19,0SPC 25,5
PowerTwist Plus belting incorporates the most up-to-date materials available, giving it unique qualities of resistanceto many of the adverse working conditions that belts are subject to, and properties that were deficient in earlierdesigns of link belts. These link belts are complementary to the range of Fenner Wedge and V-Belts and areextensively used in industrial, marine, agricultural and heating & ventilation applications.
ADVANTAGES OF FENNER LINK BELTS
Adjustable to any length, adaptable to any drive
Fit the belts to the drive, not the drive to the belts.Drive elements can be located most effectively and belts installedwithout removing bearings.
No Slippage
Quick, easy length adjustment minimises belt creep to guaranteefull speed and full productivity of machines.
Minimum Inventory
Four boxes of link belting can replace hundreds of fixed length,endless V-Belts. Boxes can be stored easily, providing simplified visualcontrol of inventory.
Vibration
Fenner link belts are manufactured to extremely close tolerances.The design of the belt significantly reduces transmissible vibrationsin some applications.
Long Lasting Construction
The extreme flexibility of these belts greatly reduces belt stress,heat build up and fatigue. The construction of the belts is designedto dissipate heat.
Maximum Power Delivery
On multiple belt drives it is easy to maintain correct tension on allbelts. Each belt carries its required load, for maximum power deliveryand longest life.
Temperature
Power Twist Plus will operate in temperatures from - 40 to 110OC.
Water, Chemical & Oil Resistance
This belt will not degrade if immersed in water or if in contact withoil, grease, agricultural chemicals and common solvents.
Economical Lengths
PowerTwist belting is also available in economical lengths.Packaged in sleeves, ideal for display or mobile maintenanceengineers.
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PowerTwist® Plus™ Belting
POWERTWIST PLUS POWER RATINGS
Rated Power (kW) Per Belt for Small Pulley Pitch Diameter (mm)Rev/min
of Z Section A Section B Section C Sectionfastershaft 56 71 90 75 90 100 112 125 125 150 180 200 180 200 224 250
PowerTwist Plus link V-Belts are manufactured from an exclusive, highstrength urethane/polyester composite. This makes PowerTwist Plusan incredibly strong, yet flexible belt that will take on the roughest ofworking conditions.
PowerTwist Plus V-Belt's unique cross-lock design gives a raw edgecog construction which provides excellent durability and performance,delivering higher power ratings than most any other link type V-Beltson the market. When the tension is applied to the belt, PowerTwistPlus's cross-link design locks tightly thus producing the lowest stretchof any link V-Belt.
PowerTwist Plus V-Belts save time on installation because no specialtools are required, all that is needed is a quick twist both to couple oruncouple the belt and this is easily achieved in seconds. Tests provethat PowerTwist Plus V-Belts are the most versatile link V-Belt on themarket today.
Available from stock in Z, A, B and C sections, for use in
standard dual groove pulleys.
SELECTION
To design a Fenner Power Twist Plus drive simply refer to the normal selection procedure (page 62) utilising the power ratings givenabove.
INSTALLATION
See page 101
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Adjustable Pitch Pulleys & Variable Speed Belts
DIMENSIONS OF LP ADJUSTABLE PULLEYS
POWER RATINGS (kW)
ISO SECTION VARIABLE SPEED
BELTS
■ PRECISION CUT ABRASION RESISTANT
SIDES
to give high torque, low slip and longer life
■ MOULDED COGS
to reduce bending stresses, givingsignificantly lower heat generation andsavings in energy
■ LENGTH STABLE POLYESTER CORDS
to ensure a maintenance free belt
Conforming to ISO 1604-1976 this range ofVariable Speed Belts is designed to transmitpower efficiently and minimise wasteful heatgeneration. The belts are manufactured withmoulded cog raw edge bases incorporatingtransversely aligned fibres. This constructionensures maximum flexibility around the pulleywhilst retaining the transverse rigidityessential for smooth transmission of power.The sides of the belts have excellent abrasionresistant properties contributing significantlyto long and useful belt life.
Minimum stretch polyester cords maintain thehigh degree of length stability now expected inmodern drive installations. Oil resistant andantistatic as standard.
W16 (17 x 5) W20 (21 x 6,5) W25 (28 x 8) W31,5 (32,5 x 10) W40 (41,5 x 13) W50 (52 x 16)
Belt Belt Belt Belt Belt BeltDesignation Designation Designation Designation Designation Designation
W16 x 560 W20 x 560 W25 x 710 W31,5 x 900 W40 x 1120 W50 x 1400
W16 x 630 W20 x 630 W25 x 800 W31,5 x 1000 W40 x 1250 W50 x 1600
W16 x 800 W20 x 710 W25 x 900 W31,5 x 1170 W40 x 1400 W50 x 1800
W16 x 900 W20 x 800 W25 x 1000 W31,5 x 1250 W40 x 1500 W50 x 2000
W16 x 1000 W20 x 900 W25 x 1120 W31,5 x 1400 W40 X 1800 W50 x 2240
W20 x 1000 W25 x 1250 W50 x 2500
W20 x 1120
GENERAL
The LP adjustable pulley is used in conjunction withstandard Taper Lock dual groove pulleys, and FennerClassic vee belts to allow small adjustments to drivenspeed from fixed speed prime movers.
CONSTRUCTION
Made from grey cast iron, these pulleys have one fixedflank, and an opposite flank which can be adjusted byscrew thread, with the drive stationary, and then fixedin position.
INSTALLATION & USE
Pulleys are supplied pilot bored for reboring/keywaying as appropriate.Drive centre distance adjustment is used tomaintain correct belt tension if pulley diameter ischanged.Note that the belt centre line shifts when diameterchanges. Driven pulley may need realignment.
Pulley Belt Max Min A D Min Max
Designation Section PCD PCD bore bore
LP80/93A Z 78 54 35 93 10 24A 85 60
LP95/108AZ 92 68 35 108 10 28A 100 71
LP112/120AZ 104 80 35 120 12 28A 112 85
LP132/138A Z 122 100 38 138 16 42A 130 100
LP160/180BA 158 128 45 159 18 48B 170 132
Pulley Belt 960 rev/min 1440 rev/min 2880 rev/min
Designation Section Max pcd Min pcd Max pcd Min pcd Max pcd Min pcd
Bores are to F7 limits, Dimensions in millimetres,* Stock pulleys are minimum bore without shaft grub screw holes. They can be supplied to size with tapped holes on request.
For other than smooth load 10 hours per day applications, the above powers should be derated by 25%,
All dimensions are in millimetres. Belt designation shows pitch length.
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01 Groove type
02 Outside diameter
03 Pitch diameter
04 Number of grooves
05 Pulley face width
06 Bore diameter (thro bore, tolerance)
07 Keyway size (width X depth in bore)
08 Taper-lock bush size
09 Taper-lock direction of entry
10 Boss position (refer cat.)
11 Material (specify)
12 Construction
13 Groove top width
14 Groove depth
15 Groove pitch
16 Driving machine type
17 Driven machine type
Quotation/Order for Special Pulleys
Ex Foundry Factory
Telefax to: Bearing Man/Fenner/Invicta Date:
Telefax No.: (011) 620-1757 Ref. No.:
Attention: B/M P.T. Order No.:
From: Branch Telefax No.:
SPZ SPA SPB SPC A B C D E ALPHA BETA DELTA POLYDRIVE
RECESSEDSIDE
FLUSHSIDE
1 2 3 4 5 6 7 8 9 SPECIAL**
CAST IRON STEEL OTHER
WEB SOLID SPOKE FLY-WHEEL OTHER
Comments:
Additional information:
Branch contact signature: Date:
B/M P.T. Acceptance signature: Date:
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Installation & Operation of Wedge & V-Belt Drives
BELT TENSION - the most important factor in the life of Vee and Wedge Belts.
Follow installation procedures to ensure the correct Belt Tension is maintained throughout Belt life.1. Place the Belts around the Pulleys without using force and ensuring that the belts are tight on the tight side of the drive.2. Using the Belt Tension Indicator as shown, set the belts to the maximum appropriate tension value stated in the “Tension Force” Table
below.3. Run the Drive under load for 30 minutes, stop the Drive, check the tension and re-set to maximum value in 2 above, if necessary.4. After 10-14 days running, check the Belt Tension and if necessary re-set to maximum value. On a correctly designed Drive there will be
no need for any further attention during the life of the belts.
As the high performance of Fenner belts require correct tension, we recommend using the Fenner Belt
Tension Indicator. Available ex-stock.
Method of Belt Tensioning1. Multiply the centre distance in meters by 16 to obtain the deflection distance in mm.2. Set the lower marker ring to the deflection distance required in mm on the lower scale.3. Set the upper marker ring against the bottom edge of the top tube.4. Place the belt tension indicator on top of the belt at the centre of span, and apply a force at right angles to the belt deflecting it to the
point where the lower marker ring is level with the top of the adjacent belt.5. Read off the force value indicated by the top edge of the upper marker ring.6. Compare this force to the kgf value shown in the table. If the measured force falls within the values given, the drive should be
satisfactory. A measured force below the lower value indicates under-tensioning.
A new drive should be tensioned to the higher value to allow for the normal drop in tension during the
running-in period.
TENSIONING FORCES TAKE-UP ALLOWANCE
Force required to deflect belt16mm per metre of span
BeltSection
mm
Newton
N
Kilogram-force
kgf
Small PulleyDiameter
mm mm mm
InstallationAllowance
Belt PitchLength
Take-upAllowance
67 - 95100 - 140
90 - 132140 - 200
140 - 224236 - 315
224 - 355375 - 560
335 & above
56 - 100
80 - 140
125 - 200
200 - 400
355 - 600
10N (SPZ)
13N (SPA)
16N (SPB)
22N (SPC)
25N DELTA
10 X 6 (Z)
13 X 8 (A)
17 X 11 (B)
22 X 14 (C)
32 X 19 (D)
13 - 2020 - 25
25 - 3535 - 45
45 - 6565 - 85
85 - 115115 - 150
150 - 200
5 - 7.5
10 - 15
20 - 30
40 - 60
70 - 105
1.3 - 2.02.0 - 2.5
2.5 - 3.53.5 - 4.5
4.6 - 6.66.6 - 8.7
8.7 - 11.711.7 - 15.3
15.3 - 20.4
0.5 - 0.8
1.0 - 1.5
2.0 - 3.1
4.1 - 6.1
7.1 - 10.7
20
25
30
50
65
20
25
30
50
65
370 - 840840 - 1155
1155 - 15401540 - 1810
1810 - 21902190 - 2880
2880 - 34903490 - 4060
4060 - 5010
5010 - 6100
6100 - 7630
7630 - 8410
8410 -10670
10670 -12220
1015
2025
3040
5060
70
85
105
125
145
175
®
Deflection in mm Deflection Force in kgf
mm kgf
10 20 30 40 50 60 14 12 10 8 6 4 2
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Installation & Operation of Wedge & V-Belt Drives
■ ALIGNMENT
Good alignment of pulleys is important toavoid belt flank wear. The diagrams belowshow some of the common alignmentfaults.
Pulley misalignment should not exceed1/2o angular and 10mm / metre drivecentre distance, axial.
A laser alignment device is available,which facilitates quick, easy and accuratepulley alignment - consult Fenner PowerTransmission Distributor.
■ BELT INSTALLATION
When the pulleys have been correctlypositioned on the shafts, the belts can beinstalled to complete the drive.
The drive centre distance should bereduced prior to the installation of thebelts so that they may be fitted withoutthe use of force. Under no circumstancesmust belts be prised into the grooves.Belts and pulley grooves can easily bedamaged by using sharp tools to stretchthe belts over the pulley rim.
The installation allowance given in thetable is the minimum recommendedreduction in centre distance for the variousbelt sections and lengths to allow forcorrect fitting.
The take-up allowance given in the sametable should be added on to the calculatedcentre distance to allow for belt stretch/bedding in.
■ GUARDS
Where guards are necessary it is desirableto use mesh materials to permit adequateventilation.
Guards should be generously sized toallow for incidental belt flap.
■ TENSIONING PULLEYS
If tensioning (jockey) pulleys are to beused on wedge belt drives, they must begrooved pulleys working on the inside ofthe drive, preferably on the slack side. Thepulley should be positioned as close aspossible to the large pulley. Flat tensioningpulleys, bearing on the outside of the driveare permissible only with vee and not withwedge belts. They should be positionedwithin one third of the centre distancefrom the small pulley.The tensioning pulley must have at leastthe same diameter as the small pulley ofthe drive.Tensioning pulley movemement mustallow for passing the belts over theoutside diameter of one of the drivepulleys on installation, and should alsoallow for belt stretch/bedding in.
1Angularmisalignment
2Compositemisalignment
4Correct installation -both shafts andpulleys are parallel andin alignment.
3Axialmisalignment
TAPER-LOCK®
All Fenner Vee and wedge belt pulleys useTaper-Lock® shaft fixing. Detailed instructionsfor fitting and dismounting Taper-Lock®
products are included with Taper-Lock®
bushes.
Although comparatively old in principletoday's belt drive is an extremely efficientmethod of transmitting power betweenprime mover and machinery.
It owes its present high performancestandards to many years of research anddevelopment by engineers andtechnologists, leading to significantrefinements in materials and processes.
To derive maximum benefit from suchadvances it is important that the simpleinstallation and operation procedures set outhere are closely followed. Making theseroutines standard practice will ensureoptimum performance and long, trouble-freelife from Fenner belt drives.
INSTALLATION
■ PULLEYS
Before assembling the drive, check thepulley grooves are free from scores orsharp edges, and all dimensions conformto the relevant standard.
Drive installation is straightforward withTaper-Lock® – but follow all steps on theinstallation leaflet provided with everyTaper-Lock® bush.
The modern wedge belt drive is ahighly efficient power transmissionmedium, but optimum performancewill not be achieved without correcttension and alignment.
CENTRE DISTANCE
16mm deflectionper 1 metre ofspan
BELT TENSIONINDICATORAPPLIED TO MID-CENTRE DISTANCE
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Pitch Length
PowerTwist® Plus™ Installation & Tensioning
Determine the required pitch length of the belt. MeasurePowerTwist Plus from the second empty hole on the last link to theend tab. Subtract one link in every 24 for Z, A, B sections, one linkin every 20 for C section. For multiple belt drives, count the numberof links in the initial belt and make additional belts the same numberof links. Lay the original belt on a table and lay the additional beltsside by side to ensure the correct length and matched sets.
1. HOW TO MEASURE
Correct way to measure:PowerTwist® Plus™ – end of tab to first empty holes (right to left, above)
2. ASSEMBLY – PowerTwist Plus
3.INSTALLATION
Make PowerTwist Plus belts to the correct pitch length and
then install them as you would an endless belt.
1. Move motor to reduce centre distance.2. Place all belts in correct position.
Where it is necessary to thread belts through confined spaces,or around shafts without moving bearings, it is possible tomake the belts "in site". Some reduction in pulley centredistance is still necessary for ease of assembly.
3. Move motor back into position, applying correct tension.4. Secure motor tightly.
Method of Belt tensioning using Fenner Belt Tension indicator
1. Calculate the deflection distance in mm on a basis of 16mmper metre of span.Centre Distance (m) x 16 = Deflection (mm)
2. Set the lower marker ring at the deflection distance required inmm on the lower scale.
3. Set the upper marker ring against the bottom edge of the toptube.
4. Place the belt tension indicator on top of the belt at the centreof span, and apply a force at right angles to the belt deflecting itto the point where the lower marker ring is level with the top ofan adjacent belt*.
5. Read off the force value indicated by the top edge of the uppermarker ring.
6. Compare this force to the kgf value shown in the tableopposite.
7. If a Fenner Belt Tension Indicator is not available, a springbalance and rule will suffice.
CAUTION
When properly installed, initial tension may appear excessive.Tension drops to normal when drive begins to run.
4. RETENSIONING
It is important to retension all drives after an initial run-in period.On fixed centre drives, it may be necessary to remove a link fromeach belt for proper retensioning.
TENSIONING FORCES
Always work with the belt inside out, tabspointing outward
Place end tab through two links atonce.
Flex belt further and insert secondtab through end link by twisting tabwith thumb.
Ensure tab returns to position acrossbelt. Reverse belt so tabs run inside.
5. DISASSEMBLY – PowerTwist Plus
Turn belt inside out with tabspointing outwards. Bend back as faras possible; hold with one hand.Twist one tab 90O parallel with slot.
Pull end of link over tab. Rotate belt end with tab at 90O to lineof belt.
Pull belt end through two links.
Force required to deflect belt16mm per metre of span
BeltSection
Small PulleyDiameter (mm) Newton (N)
Kilogram-force (kgf)
Z 56 to 190 10 to 15 1,0 to 1,5
A 80 to 140 15 to 20 1,5 to 2,0
B 125 to 200 25 to 35 2,6 to 3,6
C 200 to 400 45 to 65 4,6 to 6,6
*NOTE: For single belt drives a straight edge should be placedacross the two pulleys to act as a datum for measuring theamount of deflection.
If the measured force falls within the values given, the driveshould be satisfactory. A measured force below the lower valueindicates under-tensioning.
A new drive should be tensioned to the higher value to allow forthe normal drop in tension during the running-in period.
After the drive has been running for 30 minutes, the tensionshould be checked and re-adjusted to the higher value, ifnecessary.
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Installation
1. CLEAN PULLEYS
Check pulleys for rust and wear. Wipe clean of oil and grease.Take pulleys off machines, do not clean while running.
2. INSPECT PULLEYS FOR WEAR
Worn pulleys will substantially reduce belt life. If the grooves areworn, the belt will bottom out. This will result in slippage and thebelts may char or burn. If the sidewalls are dished out, the bottomshoulder of the pulley will wear the bottom corner of the belt,thus causing premature failure. Please use the pulley groove gauge.
3. CHECKING ALIGNMENT
Proper alignment is essential to maintain long belt and pulley life.
Pulley misalignment should not exceed 0,10 mm per 10 mm ofspan for satisfactory service.
Pulley grooves must be correct.
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Installation
4. MIXING OF BELTS
MAKES/BRANDS/TYPESNEW AND USED
Do NOT Do It!
a. Don't Mix Belt Makes
or Brands
b.Don't Mix Belt Constructions(Raw edge moulded cog/envelope)
Belt brands should not be mixed due to the difference inperformance characteristics. All Fenner belts of same type andwith same brand name/colour and size reference (datum) arematchable and no selection of suitable belts for multipleapplications is necessary.
c. Don't Mix Belts
New and Used
The new belts will be overloaded
Always replace used belts with a complete new set of belts.Never install a new or used belt as a replacement for a unit of amatched set or you will substanttially reduce drive life.
5. INSTALLING BELTS
RIGHT
Always move the driver unit forward so the belts can easily beslipped into the pulley grooves without damage to the belts.NOTE - Shut off and lock out the source of power to the motorprior to changing belts.
WRONG
Never force the belts into a pulley with a screwdriver or leverbecause you will rupture the envelope or top cover fabric and breakthe edge cords. (A belt so fitted will invariably turn over in its pulleygroove).
6. CENTRE DISTANCE ALLOWANCES FOR BELT
INSTALLATION AND TAKE-UP
After calculating a centre distance from a standard pitch lengthmake provision that the centres can be moved closer together bythe amount shown in the following table to facilitate installing thebelts without injury. Also, the centres should be adjustable overthe calculated distance by an amount as shown in the last columnof the table because of manufacturing tolerance and possiblestrength and wear of belt.
Slack-off - lower limiting value (for belt installation):nominal centre distance minus 1,5% of datum length of belt.
Take-up - higher limiting value:nominal centre distance plus 3% of datum length of belt.
Centre Distance C
Longer Centre Distance for Belt Take-up
Shorter Centre Distance for Belt Installation
NOTE: Providing that the drive was designed correctly as perparagraph '6' above and that any adjusting slides and pivots aremaintained, then there should be no problem fitting correct lengthbelts.
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Maintenance
V and wedge belt drives are recognised as extremely reliable andefficient means of power transmission. Since they are basicallytrouble-free, they are often ignored and do not receive the minimalattention required to realise their full benefit and life.
1. DIRT
No equipment operates at its best when dirty and belts are noexception. Dirt accelerates belt wear and, dirt build-up in a pulleygroove impairs traction.
Remove dirt
NOTE - Turn off power and lock out source of power to drivemotor before cleaning or repairing parts.
2. LOOK AND LISTEN
Belt drive maintenance is not complicated, nor does it require agreat deal of time or a large variety of tools. The main ingredientsof good maintenance are to look and listen and then to correctapparent drive problems.
The following maintenance and trouble shooting pointers provideinformation to help you establish an effective belt drivemaintenance programme.
Following installation of belts, inspect the drive and watch it whileit runs.
Inspection of a belt drive is simply a matter of looking and listening.
SAFETY NOTE - Belt drives should not be operated witthoutguards in place.
WHAT TO LOOK FOR:
OIL AND GREASE
Belts exposed to oil in spray, liquid or paste form fail prematurely.A drive should be well “policed”. Leaky bearings should be repairedimmediately. Excess oil on a bearing will splash on the belts. Ifthese conditions cannot be corrected special oil-resistant beltsshould be used. Too little oil will cause bearing failure which, inmany cases, is blamed on the belts. This condition causes belts toburn out due to overload.
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Maintenance
WHAT TO LISTEN FOR:
SQUEAL
This noise occurs duringmotor acceleration or whenthe motor is operating nearor at full load. It is a definiteindication of belt slippageand requires promptinvestigation. Squeal usuallyis a result of insufficient belttension. If it persists after allbelts have been checkedand tension adjusted, thedrive itself should beexamined for over-loading.
SQUEAK
This sound is like that of achirping bird or a drybearing. It occurs on alltypes and all makes of belts.Dust is often a contributingfactor. Never apply dressingor oil to a belt in an effort toeliminate squeak. Re-alignment of an idler mayhelp. Squeak is oftenannoying but it will not harmbelts.
3. ADDED LOADS
Added loads shorten belt life. A check should be made to see thatno additional loads have been added since the original drive wasselected. Take note of the drive system shown in the followingillustration.
This added loadmight reducemotor belt lifeto 18 months These belts
might run thisdrive for
5 years —
Are these beltsoverloaded now?
4. BELT GUARDS
Guards for drives ensure safety and cleanliness. Screened meshedor grilled guards are most satisfactory because they allow air tocirculate and heat to escape. NOTE - Openings are to be no largerthan 12 mm. (Human fingers must be unable to be pushed throughthe mesh).
5. CRACKING
Bottom cracking will not reduce the tensile strength or theoperating efficiency of the belt. High temperatures, small diameterpulleys and dust will accelerate bottom cracks. Bottom crackingcan be reduced by using larger pulleys and larger reverse bendidler pulleys. It is not necessary to replace a belt simply becausebottom cracking has been observed.
6. BELT DRESSING
Do NOT Use Belt DressingOf Any Kind UnderAny Circumstances.
If increasing belttension fails toeliminate slip/squeal,replace Belts and/orPulleys.
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Maintenance
7. VIBRATION
8. TENSION
Adjust tension.
9. HEAT
All belts are cured in a scientifically controlled time and temperatureprocess. Belts operating in temperatures of less than 70oC are notmaterially affected; however, at higher temperatures overcuringtakes place and shortens belt life. Belts operating in temperaturesabove 70oC should be checked frequently and a special heat-resistant construction should be considered if belt life is notsatisfactory.
10. BELT TURN OVER
Turned over belts indicate conditions of drive mis-alignment, wornpulleys or excessive vibration.
11. CHANGE IN RIDE OUT
Change in ride out indicates uneven belt wear or worn pulleys.
12. LATERAL VIBRATION
Don't allow belts to snake
13. BELT WEAR
Wear on sidewalls indicates constant slippage, excessive dust, orrough pulleys.
14. FOREIGN MATTER
Broken belts or excessive wear can result from the presence offoreign material.
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Troubleshooting
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Poly V™ Belts
The geometry of each section complies with ISO 9982.
Effective belt lengths are used with pulley effective diameters in all centre distance calculations.Belts should be designated by: number of ribs, section letters and effective length in mm (e.g. 16 PL 2235)
* Belt speeds above 40m/sec require special pulley materials – consult Fenner PowerTransmission Distributor.
Standard Effective Lengths (mm & inches)
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Selection – Poly V™ Belt Drives
Necessary drive data: Driving/driven shaft speeds (rev/min),absorbed drive power and/or motor power (kW), type of primemover (inc. electric motor starting arrangements) and drivenmachine, machine shaft diameters (mm or ins.), required drivecentre distance (mm), any other dimensional constraints.
(a) Service Factor
Select the service factor applicable to the drive from table 1below. For a speed increasing drive multiply the basic servicefactor by the special factor in the top left box to achieve the fullservice factor.
(b) Design Power
Multiply the normal running (absorbed) power of the drive, or if notknown, the motor power, by the service factor (a), to give thedesign power which is used as the basis for drive selection. Thispower should be calculated in kW.
(c) PolyDrive Belt Section
Refer to table 2, page 110 and find the point of intersection of thefaster drive shaft speed in rev/min, and the design power(b). This point will indicate required belt section and approximatesmall pulley diameters/rib numbers.NOTE: PK section Poly V belts are normally used for automotiveapplications. For general industrial applications PJ, PL or PMsection belts should be selected.
(d) Speed Ratio
Divide rev/min of faster shaft by that of the slower shaft to giverequired speed ratio.
(e) Minimum Small Pulley Diameter
Refer to table 5, page 110 to find the minimum recommendedsmall pulley diameter, using design power (b) and the faster shaftspeed.
(f) Pulley Effective* Diameters
Refer to table 6, page 111 to select pulley effective diametersgiving close to the required speed ratio (d), using (e) as a guide tosmall pulley diameter.
Calculate the exact speed ratio and check acceptability
* Note: All pulley designations show effective (outside)
diameters. Exact speed ratios are calculated using pitchdiameters,– see under table 6, page 111.
For speed increasing drives of:Speed ratio 1,00 – 1,24 multiply service factor by 1,00Speed ratio 1,25 – 1,74 multiply service factor by 1,05Speed ratio 1,75 – 2,49 multiply service factor by 1,11Speed ratio 2,50 – 3,49 multiply service factor by 1,18Speed ratio 3,50 and over multiply service factor by 1,25
(g) Belt Length and Centre Distance
Use the formulae below to establish which standard belt length(listed page 108) gives closest to the required drive centre distance.(h) Combined Correction Factor
Refer to tables 3 & 4, page 110 to find power correction factorsfor belt length and for the arc of contact for the small pulley (thelatter calculated using pulley diameters D & d, and centre distanceC - all in mm).Multiply these two factors together to give the combinedcorrection factor.(j) Basic/Additional Power per Rib
The main power rating tables on pages 111 & 112 show basicpower per belt rib, in kW, at the intersection of faster shaft speed(LH column, in rev/min) with pulley diameter (across top, in mm).Additional power per rib due to speed ratio is shown in the smallerRH table. Values for shaft speeds not listed can be derived byinterpolation.(k) Corrected Power per Rib
Add the speed ratio increment to the basic power per rib (j) andmultiply the resultant kW value by the combined correction factor(h) to give the full power per rib.(l) Number of Ribs Required
Divide design power (b) by the full power per rib (k) to give thenumber of belt ribs required. Round up to an even number andcheck whether standard pulleys are available.(m) Pulleys
When pulley specification is established, consult Fenner PowerTransmission Distributor to check availability of pulleys withTaper-Lock bush shaft fixing, and associated bore size capacity.
BELT LENGTH & CENTRE DISTANCE FORMULAE
To determine belt length (L mm) for a given centre distance(C mm) using pulleys with small/large effective diameters d/Dmm:
L = 2C + (D-d)2 + 1.57 (D+d)4C
-select the standard belt length nearest to L as calculated.
To determine centre distance for given effective pulley diametersand actual belt length:C = A + A2 –Bwhere: A = L – 0.3925 (D + d) and B = (D–d)2
4 8TABLE 1: SERVICE FACTORS
SPECIAL CASES TYPES OF PRIME MOVER
'Soft' starts 'Heavy' starts
Electric motors: Electric Motors:AC – Star delta start AC – Direct-on-line startDC – Shunt wound DC – Series & compound wound
Internal combustion engines Internal combustion engineswith 4 or more cylinders with less than 4 cylindersAll prime movers fitted with centrifugal Prime movers not fitted with soft startclutches, dry or fluid couplings or deviceselectronic soft start devices
Hours per day duty
TYPES OF DRIVEN MACHINE 10 and Over 10Over 16
10 and Over 10Over 16under to 16 under to 16
Class 1 Blowers, exhausters and fans (up to 7,5 kW), 1,0 1,1 1,2 1,1 1,2 1,3Light centrifugal compressors and pumps, beltDuty conveyors (uniformly loaded).
Class 2 Agitators (uniform density), blowers, 1,1 1,2 1,3 1,2 1,3 1,4Medium exhausters and fans (over 7,5 kW), rotary
The above chart gives approximate speed ratios between pulleys of the shown effective diameters. For exact drive ratio values, calculate the mathematical ratiobetween any 2 effective dias, (De) converted to pitch dias, (Dp) as follows: J section Dp = De + 2 mm
L section Dp = De + 5mm
TABLE 6
Basic power rating per rib (kW) for small pulley effective diameter (mm) PJ Section
The maximum axial misalignment allowed is 3 mm per metre centre distance, to amaximum of 15 mm.Make sure that angular misalignment is kept within 2o. With flat pulleys, acting as idlersfor power take-off, do not exceed 1o.A laser alignment device is available, which facilitates quick, easy and accurate pulleyalignment - consult Fenner Power Transmission Distributor.
TENSIONING THE BELT
Poly V belts must be tensioned correctly and with great care. Under or over-tensioningcan cause functional problems and lead to premature belt failure. We recommend theelongation method, which is simple and requires no special equipment, in most cases.(For narrow belts - less than 40 mm wide - it is possible to use the Fenner Belt TensionIndicator).
1. Fit the belt on the pulleys with no tension,2. Draw two lines perpendicularly across the belt back approx 80% of the belt span apart
(or one metre apart for very long spans),3. Increase the distance between the two lines by 0.5 to 0.6% i.e. by 5 to 6 mm for an
initial spacing of 1000 mm.4. Run the drive under load for about 10 minutes,5. Check the tension of the belt (i.e. the spacing between the two lines) and readjust if
necessary.
PJ - 0,5% PK - 0,6% PL - 0,6% PM - 0,6%
GENERAL
Belt LengthPJ PK PL PM
(mm) M T M T M T M T
< 750 -10 +10 -11 +13750 to 1200 -10 +15 -12 +16 -15 +201200 to 2000 -15 +20 -16 +22 -20 +252000 to 3500 -20 +30 -23 +32 -30 +35 -40 +503500 to 6000 -40 +50 -50 +70
> 6000 -100 +130
TAPER-LOCK®
Poly V pulleys are available using Taper-Lock® shaft fixing.For detailed instructions on the fitting and dismounting of Taper-Lock® products seeShaft Fixings page 203.
TM
C after take -up
Calculated C
C for fittingPulleys should be mounted as close as possible to bearings, to reduce overhung load.Pulley grooves should be in good condition, clean, and free from sharp edges.Ensure that drive machinery is securely fastened after belt installation or adjustments.Guards should be generously sized and well ventilated.
CENTRE DISTANCE ADJUSTMENT: FITTING AND TAKE-UP
RECOMMENDATIONS
d e d z
1000 mm
1006 mm
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Power Transmission Belt Drive Data
Customer ............................................... Contact .................................................... Position ...........................................................
Address ......................................................................................... Date of Enquiry .............................................................................
......................................................................................... Telephone No ................................................................................
......................................................................................... Cell No ..........................................................................................
Post Code ......................................................................... Fax No ...........................................................................................
Nature of Customer's Business ......................................................................................................................................................................
Minimum Required Technical Details for Drive Design/Recommendation
DRIVE UNIT INFO. Type *Electric Motor - High Torque Start ......................
Electric Motor - Normal Torque Start ......................
Internal Combustion Engine ......................
Other (Please State Details) ........................................................................
PLEASE STATE BELT TYPE/SECTION PREFERENCE, IF ANY........................................................................................................................
* Tick/Answer 1 Line Only; ✝ Tick/Answer as relevant; Delete as required.
FILL THIS FORM IN AS COMPLETELY AS POSSIBLE.
FAX TO: POWER TRANSMISSION DIVISION (011) 620-1757 OR (031) 336-6582