Table XVII. High-Speed Drills

Size of

Drill

(in.)

Feed per

Rev.

(in.)

Bronze Brass r.p.m.

300 FT.

C.Iron Ann'ld r.p.m.

170 FT.

C.Iron Hard r.p.m.

80 FT.

Mild r.p.m.

Steel

120 FT.

Drop Forg.

60 FT.

r.p.m.

Mal. Iron r.p.m.

90 FT.

Tool r.p.m.

Steel

60 FT.

Cast r.p.m.

Steel

40 FT.

l/16

.003

....

....

4880

....

3660

....

3660

2440

1/8

.004

....

5185

2440

3660

1830

2745

1830

1220

3/16

.005

....

3456

1626

2440

1210

1830

1220

807

1/4

.006

4575

2593

1220

1830

915

1375

915

610

5/16

.007

3660

2074

976

1464

732

1138

732

490

3/S

.008

3050

1728

813

1220

610

915

610

407

7/6

.009

2614

1482

698

1046

522

784

522

348

1/3

.010

2287

1296

610

915

458

636

458

305

5/8

.011

1830

1037

488

732

366

569

366

245

3/4

.012

1525

864

407

610

305

458

305

203

7/8

.013

1307

741

349

523

261

392

261

174

1

.014

1143

648

305

458

229

349

229

153

1 1/4

.016

915

519

244

366

183

275

183

122

1 1/2

.016

762

432

204

305

153

212

153

102

1 3/4

.016

654

371

175

262

131

196

131

87

2

.016

571

323

153

229

115

172

115

77

Work Holding

This is usually accomplished by work-holding jigs. These may be held loosely upon the work table or rigidly fastened to it as their use may warrant. (See "Jig-Making".)

Lubrication

Flood lubrication of the drill and the work is usual when production drilling upon metals other than cast iron, and tanks, pumps, and a circulating system of pipes and nozzles are provided on all drilling machines when desired for this purpose.

Fig. 350.

Fig. 350. "Single Purpose" Bemis Driller.

Fig. 351.

Fig. 351. "Reed" Geared-Drive and Geared-Feed Production Lathe Courtesy of Reed-Prentice Company, Worcester, Massachusetts.