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From: "Gerry O'Grady"
Subject: Other Uses for AC Drill Speed Control?
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Date: Tue, 01 Oct 2002 04:51:04 GMT
NNTP-Posting-Date: Mon, 30 Sep 2002 22:51:04 MDT
September 30 2002 8:12 PM
I have several trigger type speed controls from common AC powered drills.
They are (VSR) variable speed reversing Skil drills (Wound Armature and
Wound Stator) running off 115VAC. Can this trigger speed control be simply
reconfigured to run a Permanent Magnet 90v DC motor of equivalent current
The control trigger is manufactured by CAPAX mod 7-19 125VAC 4 Amp. It has
push in type terminals labeled 1 to 4 on the Top and Bottom of the switch.
Only 6 of the 8 pins are currently used - 2 for AC input, 2 for the brushes,
2 for the stator winding.
NOTE: This info might help. The PM 90VDC is presently hooked up through a
triac controlled light dimmer feeding a bridge rectifier. The motor speed
can be varied from @ 20% to 90% of full rpm, it took about 4 dimmers before
I could get one that would vary the speed smoothly over this range.
I would like to use the drill trigger ( and its reversing feature) in place
of the light dimmer without destroying my only 90 VDC motor. Any direction/
suggested wiring configuration would be appreciated.
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