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MAKE SURE THE MACHINE HAS BEEN TURNED OFF AND UNPLUGGED FROM THE POWER SOURCE BEFORE PERFORM-
ING ANY MAINTENANCE OR ADJUSTMENTS.
TABLE TILT ADJUSTMENT
Note: For the model 75-510 remove the threaded centering pin under the table before completing the following steps.
A
1.
Loosen nut A
DRILL SPEED ADJUSTMENT
This machine is equipped with a mechanical vari-
able speed drive pulley system that allows the user to
change the spindle speed while the machine is in op-
eration.
This system is considered more efficient and conve-
nient than models that require a complete shut-down
and then a more complicated change of belts on a
multi-pulley system.
To change speeds the user simply turns on the ma-
chine and then turns the speed control lever in the ap-
propriate direction until the desired speed appears on
the digital speed display.
GUIDELINES FOR SELECTING SPEEDS BASED ON BIT SIZE AND BIT MATERIAL
DOWNFEED SPEED
DRILL BIT DIAMETER
1/16" (2 MM)
1/8" (3 MM)
3/16" (5 MM)
1/4" (6 MM)
5/16" (8 MM)
3/8" (10 MM)
7/16" (11MM)
1/2" (13 MM)
5/8" (16 MM)
3/4" (19MM)
CAST STEEL
TOOL STEEL
40 pi/min
60 pi/min
1910 - 2445
2865 - 3665
1220 - 1275
1835 - 1910
765 - 815
1145 - 1220
610
915 - 955
480 - 490
715 - 735
380 - 405
570 - 610
350
520 - 525
300 - 305
440 - 460
240 - 245
360 - 365
190 - 205
285 - 305
2.
Tilt the table to the desired angle, and then retight-
en the nut A.
NOTE: TO AVOID DAMAGE TO THE GEARBOX,
SPEED CHANGES SHOULD ONLY BE MADE WHILE
THE MACHINE IS RUNNING.
BIT MATERIAL
CAST IRON
MILD STEEL
80 pi/min
100 pi/min
SPEED (rpm)
3820 - 4890
4775 - 6110
2445 - 2545
3055 - 3185
1530 - 1630
1910 - 2035
1220 - 1275
1530 - 1590
955 - 980
1195 - 1220
765 - 815
955 - 1020
700
870
590 - 610
735 -765
480 - 490
600 - 610
380 - 405
480 - 510
ALUMINUM
COPER
200 pi/min
9550 -12 225
6110 - 6365
3820 - 4075
3055 - 3180
2390 - 2445
1910 - 2035
1740 - 1745
1470 - 1530
1200 - 1220
955 - 1200
19
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