Standard Coatings | Optional Coatings | High Performance Carbide Endmill Line | Test Tool Performance | Vibration Control | Recommended Speeds and Feeds | Conversion Chart SFM to RPM cutter Diameter

Conversion Chart SFM to RPM cutter Diameter

Surface Feet Per Minute (SFM)
to Revolutions Per Minute (RPM)
Cutter Diameter

SFM
1/8”
1/4”
3/8”
1/2”
5/8”
3/4”
 7/8” 1”

50
60
70
80
90
100
150
200
250
300
350
400
450
500
600
700
800
900
1000
1100
1200

1,527
1,832
2,137
2,443
2,748
3,053
4,580
6,107
7,634
9,160
10,687
12,214
13,740
15,267
18,321
21,374
24,427
27,481
30,534
33,588
36,641

763
916
1,069
1,221
1,374
1,527
2,290
3,053
3,817
4,580
5,344
6,107
6,870
7,634
9,160
10,687
12,214
13,740
15,267
16,794
18,321

509
611
712
814
916
1,018
1,527
2,036
2,545
3,053
3,562
4,071
4,580
5,089
6,107
7,125
8,142
9,160
10,178
11,196
12,214

382
458
534
611
687
763
1,145
1,527
1,908
2,290
2,672
3,053
3,435
3,817
4,580
5,344
6,107
6,870
7,634
8,397
9,160

305
366
427
489
550
611
916
1,221
1,527
1,832
2,137
2,443
2,748
3,053
3,664
4,275
4,885
5,496
6,107
6,718
7,328

244
305
356
407
458
509
763
1,018
1,272
1,527
1,781
2,036
2,290
2,545
3,053
3,562
4,071
4,580
5,089
5,598
6,107

218
262
305
349
393
436
654
872
1,091
1,309
1,527
1,745
1,963
2,181
2,617
3,053
3,490
3,926
4,362
4,798
5,234

191
229
267
305
344
382
573
763
954
1145
1336
1527
1718
1908
2290
2672
3053
3453
3817
4198
4580

1) Finishing is defined as a radial depth of cut 10% of the tool diameter or less.
2) Roughing/Finishing is defined as a radial depth of cut of less than 25% of tool diameter.
3) Roughing is defined as a radial depth of cut of 50% or more of the diameter.
4) Feeds are based on axial depth not greater than 1-1/2 times tool diameter, if axial depth is more than 1-1/2 diameter, reduce feed by 30%.
5) When slotting, 100% of cutting diameter engaged, reduce feed by 30%.
6) Stub lengths, flute length equal to cutting diameter, increase feed by 20%.
7) To convert SFM to RPM, multiply the surface footage times 3.82 and divide by the diameter. RPM=(3.82*SFM)/Diameter
8) The above are general guidelines, actual final speeds and feeds could be higher or lower depending upon specific machining conditions.

Changes In Speeds and/or
COATING Feeds Over Uncoated Tools

TiALN Increase speeds & feeds up to 25% more.
ALTIN Increase speeds & feeds up to 30% more.
Rainbow Increase speeds & feeds up to 50% more.

 

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