Dake Corporation
1809 Industrial Park Dr
Grand Haven, MI 49417
15
REV122021
977701V
Speed Adjustment Guide:
Frequency
High Speed
(RPM)
Middle Speed
(RPM)
Low Speed
High Torque
(RPM)
10Hz
120
101
68
20Hz
234
200
112
30Hz
350
291
197
40Hz
465
387
263
50Hz
580
483
328
60Hz
695
580
400
70Hz
811
675
465
80Hz
926
771
530
90Hz
1042
865
585
100Hz
1157
964
615
110Hz
1270
1061
713
120Hz
1381
1155
776
Proper drill speed for a given drill bit size:
Material Type
Cast Steel Tool Steel Cast Iron Mild Steel
Alum. &
Copper
Drill Dia.
RPM
1/16”
2,445
3,665
4,890
6,110
12,225
1/8”
1,220
1,831
2,445
3,055
6,110
3/16”
815
1,220
1,630
2,035
4,075
1/4"
610
915
1,220
1,530
3,055
5/16”
490
735
980
1,220
2,445
3/8”
405
610
815
1,020
2,035
7/16”
350
525
700
870
1,745
1/2"
305
460
610
765
1,530
5/8”
245
365
490
610
1,220
3/4"
205
305
405
510
1,020
7/8”
174
261
348
435
762
1”
153
229
306
382
668
1-1/8”
136
204
272
340
595
1-1/4”
122
167
244
306
535