Machinery's Handbook, 31st Edition
906
Cutter Grinding Various Set-ups Used in Grinding the Clearance Angle on Milling Cutter Teeth Offset Offset Offset Offset
Rest In-Line Centers
Rest Wheel Below Center
Rest
Rest Wheel Above Center
Cup Wheel Distance to Set Center of Wheel Above the Cutter Center (Disk Wheel) Dia. of Wheel, Inches Desired Clearance Angle, Degrees 1 2 3 4 5 6 7 8 9 10 11 12 a Distance to Offset Wheel Center Above Cutter Center, Inches 3 .026 .052 .079 .105 .131 .157 .183 .209 .235 .260 .286 .312 4 .035 .070 .105 .140 .174 .209 .244 .278 .313 .347 .382 .416 5 .044 .087 .131 .174 .218 .261 .305 .348 .391 .434 .477 .520 6 .052 .105 .157 .209 .261 .314 .366 .417 .469 .521 .572 .624 7 .061 .122 .183 .244 .305 .366 .427 .487 .547 .608 .668 .728 8 .070 .140 .209 .279 .349 .418 .488 .557 .626 .695 .763 .832 9 .079 .157 .236 .314 .392 .470 .548 .626 .704 .781 .859 .936 10 .087 .175 .262 .349 .436 .523 .609 .696 .782 .868 .954 1.040 a Calculated from the formula: Offset = Wheel Diameter × 1 ⁄ 2 × Sine of Clearance Angle. Distance to Set Center of Wheel Below the Cutter Center (Disk Wheel) Dia. of Desired Clearance Angle, Degrees
1
2
3
4
5
6
7
8
9
10
11
12
Cutter, Inches
a Distance to Offset Wheel Center Below Cutter Center, Inches
2 3 4 5 6 7 8 9
.017 .035 .052 .070 .087 .105 .122 .139 .156 .174 .191 .208 .026 .052 .079 .105 .131 .157 .183 .209 .235 .260 .286 .312 .035 .070 .105 .140 .174 .209 .244 .278 .313 .347 .382 .416 .044 .087 .131 .174 .218 .261 .305 .348 .391 .434 .477 .520 .052 .105 .157 .209 .261 .314 .366 .417 .469 .521 .572 .624 .061 .122 .183 .244 .305 .366 .427 .487 .547 .608 .668 .728 .070 .140 .209 .279 .349 .418 .488 .557 .626 .695 .763 .832 .079 .157 .236 .314 .392 .470 .548 .626 .704 .781 .859 .936 .087 .175 .262 .349 .436 .523 .609 .696 .782 .868 .954 1.040
10
a Calculated from the formula: Offset = Cutter Diameter × 1 ⁄ 2 × Sine of Clearance Angle. Distance to Set Tooth Rest Below Center Line of Wheel and Cutter.— When the clear- ance angle is ground with a disc-type wheel by keeping the center line of the wheel in line with the center line of the cutter, the tooth rest should be lowered by an amount given by the following formula: Offset = Wheel Diam. Cutter Diam. + Wheel Diam. Cutter Diam. Sine of One half the Clearance Angle # # - Distance to Set Tooth Rest Below Cutter Center When Cup Wheel is Used.— When the clearance is ground with a cup wheel, the tooth rest is set below the center of the cutter the same amount as given in the table for Distance to Set Center of Wheel Below the Cutter Center (Disk Wheel) .
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