Re: [CAD_CAM_EDM_DRO] DC Surplus Motors

Just a note for anyone interested in getting into the treadmill
motors at Surplus Center.

These motors have been discussed pretty extensively in RCM over
the years. You can search the archive at google and come up
with a bunch of info. In particular the URL:

http://groups.google.com/groups?hl=en&safe=off&ic=1&th=1871dbd6bf968e95,11&seekm=8252tc%24ikb%241%40izalco.d-and-d.com#p

will get you a discussion on how to reverse the direction of the
motors.

Also there are various file format flavors of the schematic
of the motor controller at:

http://www.metalworking.com/dropbox/_1998_retired_files/

Look for treadmot.???. Also the file treadmot.txt talks about
two mods which have been worked out for the motor. The first mod
is to remove one of the transistors (pretty sure it's T3) on the
board which defeats a "feature" of the controller which prevents
the motor from starting unless the speed control pot has been
turned down to zero. The second mod is to cut a trace running to
pin 6 of the control chip and then connecting the pin to ground.
This change bypasses the "slow start feature" of the controller.
Both of these features make sense for use in a treadmill but
may not be applicable when using these motors on a machine tool.

Have fun,
Drew


--
Drew Rogge
drew@...