Smithy Midas 1220 XL - Manual (Page 35)

Chapter 7
Turning
The lathe rotates a workpiece against a cutting edge. With its versatility and numerous
attachments, accessories, and cutting tools, it can do almost any machining operation.
Table 7.1 Provides exact speeds (rpm). It does not make machine speed limitation into account.
Determine the desired rate of speed and find the closest speed available on your machine.
FPM 50 60 70 80 90 100 110 120 130 140 150 200 300
DIAM
1/16” 3056 3667 4278 4889 5500 6111 6722 7334 7945 8556 9167 12229 18344
1/8” 1528 1833 2139 2445 2751 3056 3361 3667 3973 4278 4584 6115 9172
3/16” 1019 1222 1426 1630 1833 2037 2241 2445 2648 2852 3056 4076 6115
1/4” 764 917 1070 1222 1375 1538 1681 1833 1986 2139 2292 3057 4586
5/16” 611 733 856 978 1100 1222 1345 1467 1589 1711 1833 2446 3669
3/8” 509 611 713 815 917 1019 1120 1222 1324 1426 1528 2038 3057
7/16” 437 524 611 698 786 873 960 1048 1135 1222 1310 1747 2621
1/2” 382 458 535 611 688 764 840 917 993 1070 1146 1529 2293
5/8” 306 367 428 489 550 611 672 733 794 856 917 1223 1834
3/4” 255 306 357 407 458 509 560 611 662 713 764 1019 1529
7/8” 218 262 306 349 393 426 480 524 568 611 655 874 1310
1” 191 229 267 306 366 372 420 458 497 535 573 764 1146
1-1/8” 170 204 238 272 306 340 373 407 441 475 509 679 1019
1-1/4” 153 183 216 244 275 306 336 367 397 428 458 612 918
1-3/8” 139 167 194 222 250 278 306 333 361 389 417 556 834
1-1/2” 127 153 178 204 229 255 280 306 331 357 382 510 765
1-5/8” 117 141 165 188 212 235 259 282 306 329 353 470 705
1-7/8” 102 122 143 163 183 204 224 244 265 285 306 408 612
2” 95 115 134 153 172 191 210 229 248 267 287 382 573
2-1/4” 85 102 119 136 153 170 187 204 221 238 255 340 510
2-1/2” 76
91 107 122 137 153 168 183 199 214 229 306 459
2-3/4” 69 82 97 111 125 139 153 167 181 194 208 278 417
3” 64 76 89 102 115 127 140 153 166 178 191 254 371
RPM
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