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