Re: Has anyone done one of the R/C motor spindles?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "vrsculptor"
<vrsculptor@h...> wrote:

> Has anyone done one of the brushless R/C motor spindles yet. I'm
> curious as to how it worked out and what motor/controller you used.
> Thanks,
>
> Roger

Roger, I havn't done one but I've been wondering about the same
thing. Hans Wedemeyer at http://hans-w.com has a link "DC Motor
Speed Control" on his site but I don't know if it will control a R/C
dc motor. If I remember correctly, the R/C dc motors run off of
batteries. They seem to be of high enough torque, may have a
respectable duty cycle for long machining runs, and may use rare
earth magnets to get the extra torque. I am not sure about the
bearings, their pre load, ability to take heat buildup, and the type
of bearings used, as well as the abec class. As you see I don't know
much about the performance characteristics of the R/C dc brushless
motors, but I have been wondering why they would not be useful as
high speed spindle motors for PWB drilling applications. And as you
have asked, how do you control their speed and get dc current to
them. Maybe someone will help us out with some answers.

Whelen