Suggested Speeds & Feeds For Blair Tools
These are only starting points. Correct speed may need to be adjusted accordingly

Diameter
Inches
Decimal Equivalent
Mild Steel
RPM
Soft Aluminum
RPM
Stainless Steel and Tool Steel
RPM
1/4"
0.2500
1530
11920
765
5/16"
0.3125
1220
9535
610
3/8"
0.3750
1020
7945
510
7/16"
0.4375
875
6810
440
1/2"
0.5000
765
5960
380
9/16"
0.5625
680
5300
340
5/8"
0.6250
610
4770
300
11/16"
0.6875
560
4335
280
3/4"
0.7500
510
3975
255
13/16"
0.8125
470
3670
235
7/8"
0.8750
440
3405
220
15/16"
0.9375
410
3180
205
1"
1.0000
385
2980
190
1-1/16"
1.0625
360
2805
180
1-1/8"
1.1250
340
2650
170
1-1/4"
1.2500
305
2385
155
1-5/16"
1.3125
290
2270
145
1-3/8"
1.3750
280
2170
140
1-7/16"
1.4375
270
2075
135
1-1/2"
1.5000
255
1985
130
1-9/16"
1.5625
245
1910
120
1-5/8"
1.6250
235
1835
120
1-11/16"
1.6875
225
1765
110
1-3/4"
1.7500
220
1700
110
1-13/16"
1.8125
210
1645
105
1-7/8"
1.8750
205
1590
100
1-15/16"
1.9375
200
1540
100
2"
2.0000
190
1490
95
2-1/16"
2.0625
185
1445
95
2-1/8"
2.1250
180
1400
90
2-3/16"
2.1875
175
1350
90
2-1/4"
2.2500
170
1325
85
2-5/16"
2.3125
165
1490
85
2-3/8"
2.3750
160
1255
80
2-7/16"
2.4375
160
1220
80
2-1/2"
2.5000
150
1190
75
2-9/16"
2.5625
150
1160
75
2-5/8"
2.6250
145
1135
70
2-11/16"
2.6875
140
1110
70
2-3/4"
2.7500
140
1080
70
2-13/16"
2.8125
135
1060
65
2-7/8"
2.8750
130
1035
65
2-15/16"
2.9375
130
1035
65
3"
3.0000
130
990
65