La Boulonnie AJS Process J. Allamargot - May 2014.

La Boulonnie AJS Process

J. Allamargot - May 2014

Nut’s AJS process• The nut is machined on a swiss bar lathe, Tonos Deco 20, tapped by a

single point tool.Internal thread is adjusted on a Go gage without play and also with a screw and

tested on a special bench (side to side movement).

ID thread checking on Tornos Deco 20

Screws AJS process

The screws come from a centerless raw bar and are fistly machined on

Tornos Delta12-4 (Only 2 ends schaft : Hexagonal broach & ball hole. )

Hexagonal broach checking on Tornos DECO 20

The hexagonal shape is check with a Go / No Go gage

Broaching tool

0,0795 – 0,0805

Accepted until 0,083

After they are rolled on a dedicated rolling Escofier machine .

External thread is checked with wire gages on the pitch diameter

This process gives an advantage in comparison with a single point, no burrs and a better roughness

Screws AJS process 80-100-127 TPI

Screws checking on Escofier machine

Screws AJS process for 170-254 TPIOn 170 & 254 TPI, process is different from standard.

The OD thread is made by single point tool on the high precision Boley lathe. At this step, the screw is ajusted with the nut.

Rolling process is not convenient because the supplier is not able to machine the rolls and the external variation diameter would be to high in comparison with the pitch.

After cleaning, nuts and screws are together lapped to improve the smoothness

Assembly checking

Population AJS 1/4-100

0%

5%

10%

15%

20%

25%

30%

35%

40%

45%

50%

b<10µm 10<b<20µm20<b<30µm30<b<40µm40<b<50µm50<b<60µm +

10000 AJS checked in 2013AJS 1/4-100

Side to side movement

OF Date Qté Article Vis Ecrou b<10µm 10<b<20µm 20<b<30µm 30<b<40µm40<b<50µm50<b<60µm + % contrôlées

1446774 déc.-12 200 AJS100-02H M5357C M5358A 169 21 10 0 200 100%

1457099 déc.-12 200 AJS-100-0,5K M5359C M5360A 98 43 38 21 200 100%

1537450 janv.-14 100 AJS100-1H M5362C M5358A 3 5 8 16 16%

1538713 janv.-14 250 AJS100-0,5 M5363C M5354A 8 7 7 22 9%

1527660 janv.-14 300 AJS-100-0,5KU M5361C M5354A 21 1 6 2 30 10%

1530750 janv.-14 273 AJS100-0,5K-NLU M5359C M5360A 28 28 10%

1527618 janv.-14 300 AJS-100-0,5KU M5361C M5354A 6 8 7 10 31 10%

1541154 janv.-14 100 AJS100-1H M5362C M5358A 2 2 1 5 10 10%

1540836 janv.-14 250 AJS100-1 M5355C M5354A 15 7 1 2 25 10%

1530752 janv.-14 300 AJS-100-0,5KU M5361C M5354A 20 9 9 38 13%

1521930 janv.-14 300 AJS-100-0,5K M5361C M5354A 70 77 50 50 17 18 17 299 100%

1528706 janv.-14 300 AJS100-05H M5361C M5358A 7 21 18 30 5 81 27%

1538720 janv.-14 250 AJS100-0,5 M5363C M5354A 6 5 11 3 25 10%

1533945 janv.-14 300 AJS-100-0,5K M5361C M5354A 12 7 5 6 30 10%

1539325 janv.-14 300 AJS-100-0,5KU M5361C M5354A 13 5 10 4 32 11%

1538721 janv.-14 300 AJS100-0,5 M5363C M5354A 8 9 6 3 1 27 9%

0 #DIV/0!

0 #DIV/0!

4853 2101 1523 1287 336 198 166 0 10464

Population AJS 1/4-100 46% 20% 15% 12% 3,2% 1,9% 1,6% 0,0%

Total global

Battement "b" (µm)

The play is checked on a special bench and limited at 40µm (side to side movement)

AJS allowancesConf Call US/France synthesis of September 15th 2011 dataInternal thread single point since Jan 2013

Same pitch diameter NEW Pitch diameter

I-Nano 6,170

Micro 6,167 Micro 3,984

New Focus 6,151

(wire diameter 0,144 => constante = 0,212)

Pitch Diameter tolerances

Ø Pitch Diameter 6,185

Nut 3B

+0,051

6,236

6,206

6,198

Tap tolerances 6,198 0 / + 8 µm

Screw 3A

6,171

6,163Micro Screws 6,167 +/-

4µm

6,144

-0,040

0,01

4

1/4 - 100 N � 8 - 100

4,048

+0,048

Nut 3B4,021

Tap tolerances 4,013 0 / +8 µm

4,013Ø Pitch Diameter

4,001

0,01

4

Screw 3A

3,962

-0,038

0,01

3

3,987

3,981

0,01

2

M5361C / INANO Screws

6,170 + / -8 µm

Micro Screws 3,984 +/ - 3µm

6,178

6,162

200 parts checked from last batch of 8000 (May 23 rd 2011)

6,160

6,142

New Focus 10 samples 9377K

6,151 +/- 9µm

1/4

Gage

1

1/4

Gage

2

1/4

Gage

3

N�8

Gag

e 1

N�8

Gag

e 2

N�8

Gag

e 36,2103

6,2357

6,1976

6,223

6,1849

6,2103

4,0246

4,0487

4,0125

4,0366

4,00050

4,0246Tapping has been replaced by single point threading. Nut is adjusted on 4,001 plug gage since Jan 2013

With Single pointAdjusted thread on the plug gage(Estimation)

0,00

5 0,01

8

• Fichier side to side movement AJS

• Fichier des tolérances AJS8-100 et ¼-100

Special AJS

  Screw bushing Nut BallGrease for Movement

Grease for ball

Assembly & cleaning process

Standard 430F UZ39Pb2 UZ39Pb2 440C868 Gel

Fluorocarbon Nye Gel 767A standard

V6 430F UE9P UE9P 440C Braycote 601 Apiezon H A47 / A484

> 10-6 Torr or Deep UV 304 UE9P UE9P 440C Krytox 240AC Epoxy A47 / A484