-
1 Contents
of tools. Tool grinding, Movements of cutter and workpiece. The
requirements of a machine tool. Summary.
16 Marking-out and Location of Work Methods of marking out.
Accuracy of marking out. Coordinates. Jigs and fixtures.
Summary.
17 Plane Surfaces 219 Introduction to plane surfaces. Straight
edges. The try-square.
Y 3 Summary.
18 Lathes 225 Main features of a centre lathe. Types of lathe
work. Chucks. 'ace-plates. Steady rests. Setting of tools. Speeds,
feeds, and depths 'cut. Lathe operations. Taper turning and boring.
Screw cutting. ??.tan and turret lathes. Lathe alignments. Care of
lathes. :ty in the machine shop. Summary.
'Iling Machines i of drilling machines. Operations and cutters.
b ?n of workpieces. Drilling machine alignments. Summary.
i aping, Slotting, and Planing Machines 262 'ping machine. The
slotting machine. Planing machines. groove. Summary. ding Machines
282
milling machines. Types of milling cutters. Up-cut milling
,own-cut milling. Straddle milling and gang milling.
"kpiece location and holding. Milling machine alignments.
mary.
r -- II
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2 2 Grinding, Honing, and Lapping Grinding. Honing. Lapping.
Summary.
Contents
23 Engineering Measurement 314 Standards of length. The
measurement of length. Comparators. The measurement of angles.
Summary.
2 4 Dimensional Control 339 Tolerances and limits of size. Fits.
Systems of limits and fits. British Standard 4500, 1969:
specification for I S 0 limits and fits. Dimensional control. Limit
gauging. Summary.
25 Machine-shop Process Planning 355 Process sheets and choice
of planning method to suit production volume. Choice of location
points. Planning method. Specimen operation layouts. Summary.
26 Floor-tefloor Times 370 Introduction. Calculation of times
for lathe work. Calculation of times for drilling machine work.
Calculation of times for milling machine work. Calculation of times
for reciprocating machine work. Calculation of times for
cylindrical grinding. Calculation of times for surface grinding.
Examples. Summary.
Bibliography
-
Index
Abrasive, 297,298 grain size of, 299
Acid steels, 27 Adhesive joining, 150 Adjustable reamer, 255
Admiralty brass, 61 Admiralty gunmetal, 62 Air-hardening steels, 52
Airy points, 3 16 Alignment: of drilling machines,
of grinding machines, 306 of lathes, 245 of milling machines,
291 of planing machines, 277 of shaping machines, 268 of slotting
machines, 274
Alloy, 2 Alloy cast irons, 24 Alloy steels, 49 Aluminium, 56, 66
Aluminium alloys, 58
casting, 59 corrosion protection of, 59 heat-treatment of, 59
wrought, 59
Aluminium bronzes, 63 Angular measurement, 327
by balls and rollers, 333 by sine bar, 328 by spirit level, 330
by vernier protractor, 327
Annealing, 99 of aluminium alloys, 59
of brasses, 6 1 of copper, 5 7 of steels, 36
Anodising, 59 Antimony, 64, 65 Approach angle, 176 Arc of
contact when grinding, 301 Arc-welding, 142 Area of contact when
grinding, 301
258 Arithmetic progression, 193, 194 Arsenic in copper, 5 7
Austenite, 33 Austenitic steels, 53
Backing sand, 106 Balancing of grinding wheel, 304 Bar material,
93 Bar standard, 3 15 Base of an alloy, 2 Base-metal thermocouple,
80 Basic steels, 27 Bearing metals, 64 Bed-type milling machine,
284 Bedding, 220 Bend tests, 10 Bending operation, 153 Beryllium,
56, 65 Bessemer process, 28 Bilateral limits, 340 Blackheart
malleable cast iron, 22 Blanking operation, 152 Blast furnace,
16
metal, 16
-
Block level, 330 Blow forming, 169 Bolster for press set, 156
Bond for abrasive, 297,299 Brasses, 60, 64 Brazing, 150 Bright
drawn bar, 93 Brinell hardness test, 11 British Standards
Institution, 7 Brittleness, 5 Bronzes, 62 Built-up edge, 174 Bunsen
burner, 72 Button boring, 2 11
Capstan lathe, 244 Carbon, 16
in cast iron, 20 in steels, 26
Carbon electrode, 142 Carburising, 42
gases, 70 Cartridge brass, 61 Case-hardening, 42
steels, 5 1 Cast iron, 16
alloy, 24 blackheart malleable, 22 grey, 20 high-duty, 23
inoculation of, 23 malleabilising of, 22 mottled, 2 1 pearlitic,
22-3 production of, 19 spheroidal graphite, 23 structure of, 20,
22-3 white, 20 whiteheart malleable, 22
Casting, 92 defects in, 123 methods: centrifugal-, 123
die., 126 investment-, 129 sand-, 105
of plastics, 169 of phosphor bronze, 62
Celluloid, 163 Cellulose plastics, 163 Cemented-carbide tool
material, 185 Cementite, 17, 26 Centre lathe, 225 Centre punch, 204
Centrifugal-casting, 123 Chaplet, 11 1 C h q y test, 12 Chasing
dial, 243 Chasing tool, 243 Chill, 21 Chip formation: built-up
edge, 174
continuous, 173 discontinuous, 174
Choice: of datum points for machining, 358
of location features for machining, 36 1
of material, 1 of pyrometer, 90
Chromium, 56 in alloy steels, 50 in cast iron, 24
Chucks, 23 1 Clamping: of milling fixtures, 2 17
of workpiece, 2 15 Clapper box, 264 Classification: of grinding
wheels,
304 of materials, 1
Clearance angle, 172, 173 Clearance fit, 34 1 Cobalt-base tool
alloys, 185 Coining, 101, l54 Cold-chamber die-casting, 128
Cold-extrusion, 101 Cold-heading, 102 Cold-rolling, 99 Cold-short,
18 Cold-working processes, 92,98 Column drilling machines, 252
Comparators, 323
-
Compound gear train, 241 Compound slide rest, 229
Compression-moulding process, 167 Continuous chio formation. 173
Continuous furnace, 75 Contraction rule, 105 Convertor processes
for steel
production, 28 Coordinates, 208 Cope, 107 Copper, 56
in alloy cast irons, 24 Copper alloys, 57 Copper-based alloys,
60 Copying, 191 Core: for sand-casting, 109
stripping, 118 Core print, 110 Corrosion-resisting steels, 53
Counterboring, 256 Countersinking, 257 Cracking of steel during
heat-
treatment, 39 Creep, 13
testing, 13 Crimping, 154 Critical cooling rate for steels, 38
Critical points for steels, 33 Cropping, l52 Cross-wind, 226
Cupola, 19 Curing of plastics, 162 Cutters: for planing machines,
272
for slotting machines, 272 Cutting fluids, 182 Cutting-tool:
forces acting on, 181
materials, 183 shape, 175
Cyanide process, 44 Cylindrical square, 222
Datum points, 35 8 Decarburisation of steel, 43 Deep drawing,
100, 153 Defects in castings, 123
Degrees of freedom, 2 1 4 15 Depth gauge: micrometer, 323
vernier, 32 1 Design: for die-casting, 129
for heat-treatment, 41 Deviations from size, 345 Dial-indicator,
324
uses of, 325 Diamond tool material, 186 Die-casting, 126
design for, 129 Die-forging, 98 Die-sets, 156 Dimensional
control, 339,347 Dimensioning to improve accuracy,
?All - .- Disappearing-filament pyrometer, 88 Discontinuous chio
formation. 174 Dividing chuck, 290 Dividing head, 290 Double-acting
press, 154 Down-cut milling, 288 Drag, l06 Drawback, 1 13 Drawing,
93
press tool set for, 159 Drawing-down, 97 Dressing of grinding
wheel, 304 Drill: spade, 177
twist, 177 Drilling: jig, 2 15
machine, 252 alignment of, 258 column, 252 portable, 252
radial-arm, 253 sensitive, 252
operations, 254 reaming, and boring in a lathe, 236 speeds and
feeds, 255
Drop-stamping, 98 Ductility, 4, 9, 10
Elastic limit, 2, 10 Elasticity, 2
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-T
Index
Electric-arc furnace, 19, 30 Electric-arc welding, 142 Electric
furnace, 76 Electric processes for steel
production, 30 Electrical re&ance thermometer, 83 Embossing,
101, 154 End bars, 3 15 End standard, 3 15 Ending up, 236
End-milling cutters, 286 Engineer's block level, 330 Engineer's
rule, 3 18 Epoxy resins, 166 Equilibrium diagram for steels, 35
Eutectic, 65 External grinding, 305 Extensometer, 7 Extruded
sections, 95 Extrusion, 97 Extrusiou-moulding of plastics, 168
Faceplate, 232 Facing sand, 106 Factory inspectors, 249
Fastening, 133 Fatigue, 12
testing, 12 Feed: of cutting tool, 177
for drilling operations, 255 Feeding of strip material in
presswork, 155 Feeler gauges, 3 17
accuracy of, 3 17 Ferrite, 17, 26, 33 Ferrous materials, 1 Fits,
341 Fixtures, 2 13
milling, 2 16, 2 17, 29 1 Flame-cutting, 148 Flame-hardening,
42.45 Flash, 98 Flash-butt welding, 136 Flask, 106
Floor moulding, 112 Floor-to-floor times, 370 Fluorine plastics,
165 Folded joint, 134 Follow-on pierce-and-blank press-
tool set, 156, 158 Forced air-circulation furnace, 77
Forge-welding, 135 Forging, 95, 97 Forging-dies, 98 Form-milling
cutters, 287 Form relief, 189 Fonn-tool manufacture, 190
Forming-cutting operations, 188 Forming: of plastics, 168
operations in presswork, 153 Fundamental deviations from
size,
345 Fusible cones, 79 Fusion-welding, 138
Gang milling, 289 Gap gauge, 349 Gas-fired furnaces, 69
Gas-torch welding, 142 Gas-welding, 146 Gauge blocks, 3 16 Gauge
length, 7 Gauging of shafts, 349 Gearbox, 199 Gear train: compound,
241
simple, 240 Generating, l 9 1 Generation of try-squares, 223
Geometric progression, 194, 195 Glazing of grinding wheel, 298 'Go'
gauge, 348 Gooseneck system of die-casting, 127 Grades of
tolerance, 344 Grain: fibre, 92
flow, 92 growth, 43 size of abrasive, 299
Graphite, 17, 20 Graphitisation, 2 1
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Gravity die-casting, 126 Grey iron, 20 Grinding, 296
arc of contact, 30 1 area of contact, 301 external, 305
internal, 305 surface, 306
Grinding machine: alignments, 306 movements, 305
Grinding wheel: balancing, 304 bond, 299 classification, 304
cutting action, 297 dressing, 304 end-cutting, 297 grade, 300
mounting, 304 peripheral-cutting, 296 selection, 303
self-sharpening, 298 speed, 302 structure, 297, 300 tming, 304 work
speed, 302
Gunmetals, 62
Hafnium, 56, 66 Hand lapping, 309 Hardening: of high speed
steel, 73
of steels, 38, 42 Hardness, 5
tests, 11 Heat-resisting steels, 54 Heat-treatment, 69
of aluminium alloys, 59 of cast iron, 2 1 of steels, 33, 36
furnace, 69
Hermaphrodite compasses, 204 High-duty cast irons, 23
Hone, 306 abrasive, 306
Honing, 296, 306 cutting action, 308 machine, 309
Hooke's law, 3, 10 Horizontal milling machine, 282 Hot-chamber
die-casting, 127 Hot-rolling, 95 Hot-short, 18 Hot-working,
92,95
Impact extrusion, 101 Impact tests, 11 Imperial standard yard, 3
15 Impurities in steel, 17, 26 Inconel, 64 Indicating gauges, 35 1
Induction furnace, 3 1 Induction hardening, 42,45, 46 Induction
heating, 77 Ingot, 92 Injection-moulding of plastics, 167
Inoculation of cast irons, 23 Inserted cutter blades, 185 Inside
micrometer, 323 Inspection of welds, 149 Interchangeability,
314,339 Interference fit, 342 Internal grinding, 305 Investigations
into metal cutting, 181 Investment-casting, 129 Izod test, 12
Jennies, 204 Jig, 213
for drilling, 2 15 Jig-boring machine, 209, 210 Joining:
mechanical methods, 133
metallurgical methods, 134 plastics, 170
High-frequency induction furnace, 3 1 K~~~~~~ as length
standard, High-speed steels, 50, 184 High-tensile steels, 52
Laminates, 166 Hole-based system of limits, 342 Laminating of
plastics, 170
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Index
Landing groove, 278 Lapping, 296, 309 Lathe: alignments, 245
bed, 226 care of, 248 chucks, 23 1 compound slide rest, 229
faceplate, 232 feedshaft, 228 headstock, 226 spindle nose, 228
steady rest, 233 tool setting, 233 types: centre, 225
capstan, 244 turret, 244
Lathework, 299 effect: of cutting fluid, 235
of material, 235 of surface finish, 235 of type of lathe, 235 of
type of operation, 235 of type of work, 234
speeds, feeds, and depths of
Lead, 57,62 Lead-base bearing alloy, 64 Length gauge, 349 Length
measurement, 3 18 Level-comparator, 332 Limit gauges, 348
gap, 349 indicating, 35 1 length, 349 plug, 348 receiver, 350
recess, 349 ring, 349 rod, 348 screw-thread, 349 stepped taper, 350
taper, 350 thickness, 349
Limit: of elasticity, 4 of proportionality, 4
Limits and fits, systems of, 342 Limits of sizes, 339 Line
standards, 3 15 Lintz-Donawitz process, 29 Loading of grinding
wheel, 298 Loam moulding, 114 Location: for drilling, 258
features, 36 1 fmm holes, 362 of milling fixture, 2 17 of
workpiece, 2 14
Liquid mercury thermometers, 79
Machine lapping, 309,3 10 Machine-tool: gearboxes, 192
requirements, 192 Machine vice, 289 Machining: allowance,
204
of plastics, 170 Magnesium 57,66
alloys, 63 Malleabilising of cast irons, 22 Malleability, 5
cuts, Manganese, 27 234 in alloy steels, 50
Manganese bronze, 61 Marking-out, 204
accuracy of, 208 Martensite, 38 Materials: classification of,
1
for cutting-tools, 183 Measurement: of angles, 327
by balls and rollers, 333 by sine bar, 328 by spirit level, 330
by vernier protractor, 327
of length, 3 18 Mechanical joining methods, 133 Mer, 161
Metal-cutting investigations, 181 Metal electrode, 142 Metal
joining: adhesives, 150
brazing, 150 soldering, 150 welding, 135
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Metre, 3 15 Micrometer, 321
depth gauge, 323 inside, 323
Microstructure, 17 Milling, 282
straddle and gang, 289 up-cut and down-cut, 288
Milling cutter, 180,285 end cutters, 286 form cutters, 287
roller cutters, 285 side-and-face, 286
Milling fixture, 216, 217, 291 Milling machine, 282
alignments, 29 1 bed-type, 284 horizontal, 282, 283
knee-and-column, 282 universal, 284 vertical, 282, 283
Modulus of elasticity, 3 Molybdenum: in alloy steels, 50
in cast iron, 24 Monel, 63 Monomer, 16 1 Mottled irons, 2 1
Mould, shell, 122 Moulding, 106
floor, 1 12 loam, 1 l 4 odd-side, 1 12 of plastics, l67 plate, 1
19 sand, 105
Moulding box, 106 Moulding Bask, 106 Moulding sands, 120
essential properties of, 120 Mounting of grinding wheel, 304
Movements: of cutter and workpiece,
188 of grinding machine, 305
Mume furnace, 7 1 Muntz metal, 61
Naval brass, 6 1 Negative rake, 173 Neutral atmosphere, 70 'New'
metals, 65 Nickel, 57, 62
in cast iron, 24 in steels, SO
Nickel alloys, 63 Nickel bronzes, 62 Nickel-chromium alloys, 64
Nickelxopper alloys, 63 Nickel-iron alloys, 63 Nickel silver, 62
Nimocast alloys, 64 Nimonic alloys, 64 Niobium, 66 Nitriding, 42,
44
steels, 5 1 Nitrocellulose, 163 Non-ferrous metals, 1, 56 N.P.L.
level-comparator, 332 Normalising, 26.37 'NOT Go'gauge, 348 Nylon,
165
Observed times, 370 Odd-side moulding, 1 I2 Open-hearth process,
29 Operation layouts, 364 Operation sheet for production, 357
Operations list: for production shop,
357 for tool-room, 356
Optical pyrometer, 88 Oxidising atmosphere, 70
Parting sand, 107 Pattern: for sand casting, 105
skeleton, 114 Pearlite, 17, 26
sorbitic, 39 troostitic, 39
Pearlitic: cast iron, 23 malleable cast iron, 22
Percentage elongation after fracture, 9
-
Index
percentage reduction of area, 9 Peripheral-cutting milling
cutter, 1 Phenolic plastics, 166 Phosphor bronze, 62,64 Phosphorus,
17,62
in steels, 27 Piercing, 152 Pig iron, 16,27 Plain carbon tool
steels, 184 Plane surfaces, 2 19 Planing machine, 275
alignment, 277 tools, 277
Planning method, 355,362 Plasticity, 5 Plastics materials, 16
1
cellulose, 163 condensation polymers, 165 curing of, 162
fluorine, 165 laminates, 166 manipulation methods, 167
casting, 169 forming and pressing, 168 jo in i i , 170
laminating, 170 machining, 170 moulding, 167
phenolic, 166 polyesters, 165-6 thermosetting, 162, 166
thermosoftening, 16 1, 163 vinyl, 163
Plate metal, 95 Plate moulding, 119 Plate welds, 140 Plug gauge,
348 Plumber's solder, 65 Polar coordinates, 208 Polyamides, 165
Polyesters, 165 Polymer, 161 Polystyrene, 164, 165
PolytetraAuoroethylene (PTF~), Polythene, 164
Polyvinyl chloride (PVC), 164, 165 Portable drilling machines,
252 Presses, 154
capacity, 155 double-acting, 154 single-acting, 154
triple-acting, 155
Pressing, 99 of plastics, 168
Press tools, 152 Pressure die-casting, l26 Pressure-welding, l38
Presswork, 152 Process planning, 355
sheets, 35 5 Profile location, 36 1 Progressive error, 321
Projection spot-weldiag, 138 Proof stress, 9, 10 Properties of
metals and alloys, 2 ~ u d d l i i g furnace, 18 Pure metals, 1
Pyrometry, 78
pyrometers, 79-90 choice of, 90
Quality control, 347 Quenching: medium, 39
of steel, 3 6 Quick-return action, 265
Radial-arm drilling machine, 253 Radiation pyrometer, 85 Rake
angle, 172 Rare-metal thermo~~uple, 80 Rating of effort, 370
Reaming operation, 255 Receiver gauges, 350 Recess gauge, 349
Reciprocating machine tools, 262 Recorders, 83 ~ectangular
coordinates, 208 Red hardness, 184 ~educing atmosphere, 70
Relieving tool, 273
-
Index
Research tests, 7 Resistance-welding, 135 Ring gauge, 349 Riser,
107, 108 Riveting, 134 Rockwell hardness test, 11 Rod gauge, 348
Roll arrangements in rolling mill, 96 Rolled sections, 94 Roller
cutters, 285 Rotary furnace, 19, 20 Rotary milling table, 289
Routine tests, 7 Rule, 3 18 Runner, 107, 108
Safety: factor, 9 in the machine shop, 248
Salt-bath, 43 furnace, 76
Sand: composition, 12 1 moulding, 105, 120 testing of, 122 types
of, 106
Sand-casting, l 0 5 Scale formation, 70 Screw-cutting, 239
Scrihing block, 204 Seam-welding, 138 Selection of joining method,
13 3 Self-sharpening action of grinding
wheel, 298 Sensitive drilling machine, 252 Setting down, 97
Setting of lathe tools, 233 Shaft-based system of limits, 342
Shaping machine, 262
alignments, 268 operations, 267
Shear on press tools, 156 Sheet material, 94 Shell end mill, 180
Shell moulds, 122 Shock resistance, I I Side-and-face
milling.cutters, 286
Silicon, 17, 2 1, 26 Silver, 56, 57 Simple gear train, 240
Sine-bar, 328
applications of, 329 Single-acting presses, 154 Single-point
cutting tool, 177 Sintered oxide tool materials, 185 Six degrees of
freedom, 2 l4 ,2 15 Skeleton patterns, 114 Slip gauges. 3 16
applications of, 3 17 care of, 3 17
Slotting cutters, 272 Slotting machine, 270
alignments, 274 operations, 274
Solder, 65 Soldering, l50 Solid solution, 17, 33 Sorbite, 40
sorbitic pearlite, 39 Spade drill, 177 Speed: for drilling,
255
progressions, 192 Spheroidal graphite cast iron, 23
Spheroidising of steel, 37 Spinning, 102 Spirit level, 330 Split
patterns, 109 Spot-welding, l37 Spray steelmaking, 3 1 Spring-hack
allowance when bending,
153 Standards of length, 3 14
bar, 3 15 end,315 line, 315
Steady rests, 233 Steel, 16, 26
acid, 27 air-hardening, 52 alloy, 49 austenitic, 53 basic,
27
-
Index
Steel--(conrd.) carburising of, 42 case-hardening of, 42
corrosion-resisting, 53 cracking of, 39 critical cooling rate of,
38 hardening of, 38.42 heat-resisting, 54 heat-treatment, 33, 36
high-speed, 50, 184
hardening of, 73 high-tensile, 52 impurities in, 17, 26
nitriding of, 5 1 plain carbon tool, 184 quenching of, 36
spheroidising of, 37 structure of, 27, 35, 44 surface-hardening of,
42 wear-resisting, 53
Steelmaking processes, 27 Stepped taper gauge, 350 Straddle
milling, 289 Straight edges, 221 Strain, 3 Statistical quality
control, 347 Stress, 3 Stripper plate, 15 6 Structure: of
carburised steel, 44
of casehardened steel, 44 of cast irons, 20,22,23 of grinding
wheel, 300 of steels, 27, 35 of wrought iron, 18
Subcritical annealing, 37 Sulphur, 18.27 Surface grinding, 305
Surface-hardening of steel, 42 Surface plate, 2 19
Tap, 257 tapping, 257
Taper turning and boring, 237 by combining feeds, 239 by setting
compound rest, 238
by setting over the tailstock, 237 by turning attachment,
238
Taper measurement, 333 Tellurium in copper, 57 Temper
brittleness, 50, 52 Tempering, 40 Tenacity, 2 Tensile strength,
9
test, 7,9 Testing: of metals, 7
of sand, 122 Thermocouple, 80 Themo-electric pyrometer, 79
Thermometers, 79 Thermosetting plastics, 162, 166 Thermosoftening
plastics, 16 1, 163 Thickness gauge, 349 Times: for cylindrical
grinding, 375
for drilling-machine work, 372 for lathework, 371 for
milling-machine work, 373 for surface grinding, 376
Tin, 58 Tin-base bearing alloy, 64 Tin bronzes, 62 Tinman's
solder, 65 Titanium, 58 Tolerances, 339 Tool: dynamometer, 18 1
grinding, 187 life, 182 materials, 183 storage and distribution,
$86
Toolmaker's buttons, 2 11 Toolmaker's flats, 221 Toughness, 5,
11 Trail angle, 176 Transition fit, 342 Tricel, 163 Triple-acting
presses, 155 Troostite, 40 Troostitic pearlite, 39 Truing of
grinding wheel, 304 Try-square, 221 Tube drawing, 100
-
Index
Tube material, 95 Tungsten, 56
in high-speed steels, 50, 184 Turning between centres, 229
Turret lathes, 244 Twist drill, 177
Unilateral limits, 340 Universal milling machine, 284 Up-cut
milling, 288 Upsetting, 97
Vacuum-forming ofplastics materials, 168
Vanadium, 56,66 Vapour-pressure thermometer, 79 Vee-bending
press-tool set, 159 Vee-blocks, 206 Vee location, 36 1 Venting of
sand moulds, 108 Vernier, 3 18
caliper, 320 depth gauge, 3 2 1 height gauge, 320 protractor,
327
Vertical milling machine, 282, 283 Vickers pyramid hardness
test, 11 Vinyl plastics material; 163 Voids, 297
Waisting, 5 Wear-resisting steels, 53 Welding, 135
arc-welding, 142 Aash-butt welding, 136 forge-welding, 135
fusion-welding, 138 gas-welding, 146 inspection of welds, 149
pressure-welding, 138 projection spot welding, 138
resistance-welding, 135 seam welding, 138 spot welding, 137
Wheatstone bridge, 83 Wheel: glazing, 298
loading, 298 speed for grinding, 302
White iron, 20 Whiteheart malleable cast iron, 22 Whitworth, Sir
Joseph, 219 Wire drawing, 100 Work-hardening, 92,93,99 Working,
18,92 Workpiece location, 2 14, 2 15
for drilling, 258 for milling, 289
Wrought: forms, 93 structure of, 92
Wrought iron, 16, 18 production of, 18
Yield point, 4, 9, 10 Young's modulus of elastidity, 3
Zinc, 58 Zirconium, 56,66
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