1-12. Theory of Operation: The 501G is foot powered, using levers and linkage to transmit and multiply
the force applied to the foot pedal (78), from the foot pedal (78) to the upper tool holder (69).
1-13. OPERATIONAL PROCEDURES
1 - 1 4 . Deriveting.
1-15. Rotate lower tool holder (562) fully clockwise.
1-16. Select proper knockout punch and punch point, (see tool application chart, paragraph 1-40).
1-17. Insert knockout punch into upper tool holder (69) with tapered end going into upper tool holder (69).
It is very important that when installing tools into machine that you do the following in order to get perfect
alignment.
First, clean taper on tool you are inserting into upper tool holder (69). This is done by wiping with a
rag. Then insert tool into holder.
1-18. Insert knockout bushing (#36 or 76) into lower tool holder (562).
1-19. Insert driver (#73) into lower tool holder (#562) and bushing (#36).
1-20. Depress foot pedal (78) to floor, hold foot pedal (78) in this position and rctate lower tool holder (562)
until punch point is positioned against driver (73), then release pedal and adjust lower tool holder (562) of a
turn counterclockwise, then depress foot pedal (78) until knockout tool is locked into upper tool holder (69),
adjust accordingly. Once this is done remove driver (73) and rotate Iower tool holder (562) until punch point is
positioned approximately " into lower tool holder bushing (76 or 36). Release foot pedal (78). NOTE: Do not
over adjust, as you can break riveter head.
1-21. Place brake shoe etc. on top of lower tool holder (562) with bushing in it (76 or 36). Depress foot pedal
(78) fully to punch out rivet. If rivet is not knocked out adjust lower tool holder (562) accordingly as stated in 1-
1-22. Loosen roller handles (50) and place deriveted brake shoe on grinder table (24) against rollers (52).
Adjust rollers (52) so brake shoe table will contact all 4 rollers (52) and grinding sleeve at the same time. This is
done by loosening clamp screw assemblies (39) and sliding roller guide bracket assemblies (51) to the
location desired. Tighten roller handles (50) and clamp screw assemblies (39).
1-23. Switch on motor (56) at switch (60) and move brake shoe back and forth against grinding sleeve until
brake shoe table is clean.
1-24. Switch off motor (56) at switch (60).
1 - 2 5 . Countersinking.
1-26. Select proper countersink and drill (see tool application chart, paragraph 140).
1-27. Lift countersink guide (1) and insert countersink into spindle (12), being sure it is fully seated. Tighten
socket set screw (11) and return countersink guide (1) to its position.
1-28. Switch on motor (56) at switch (60).
1-29. Adjusting countersink drilling depth, place lining, etc. on drill table (5) over countersink. Push lining
down until drill table (5) hits stop screw (10), Then turn stop screw (10) counterclockwise or clockwise to
regulate depth required. To determine correct depth slide lining against countersink, and observe mark left by
countersink cutting tips. Mark indicates depth of hole countersink will drill.
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