I also bought one of these from H/F and have found it to be totally
useless. As I slow the speed down the torque plunges. When the rpm gets down
to about 15000 just putting the bit against a board brings the bit to a
stop.
Dick
--
Building and repair of fine custom cues at affordable
prices for real poolplayers. Over 35yrs. exp.
Richard H. Neighbors 318 Linden st. Cinti. OH
ph.# (513) 242-1700
web-site:
http://www.dickiecues.com
"Jeff Wisnia" wrote in message
...
Jack Erbes wrote:
Someone asked if this router speed control would be okay to use with a
typical non-variable speed 1/2" drill motor (5 Amps or so).:
http://www.mlcswoodworking.com/shops.../speedcon.html
I called to get a little more info and the seller says that it is for
use with "brush type motors of up to 15 Amps" and that it is a
"voltage sensitive device that maintains constant torque".
If I understand it right, this must do more than simply drop the
voltage. I wonder if this is like a VFD in that it can vary speed
without overheating the windings? Anyone want to venture a guess on
how this works?
I'm reluctant to tell someone to do something that might fry their
drill motor. If it works as they say, for $24 and free shipping, I
might get one myself.
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It should work fine with a brush type motor in a drill.
IIRC those speed controls sense the "generated" back EMF during the
portions of each
half wave cycle when their controlling triac is "off" and use that voltage
as a
feedback signal to help keep the motor at a constant speed in the face of
varying
torque loads.
IIRI, someone please correct me...
FWIW, I picked up a similar appearing speed control device from HF when it
went on sale
for less than $10 and it's worked well for me the few times I've used it
on my router.
Jeff
--
Jeff Wisnia (W1BSV + Brass Rat '57 EE)
"If you can keep smiling when things go wrong, you've thought of someone
to place the
blame on."