Re: What variable speed motor to use?

I'm using a Porter Cable laminate trimmer with a 6 Amp fan controller
( $19.00 ) from Lowe's. Lowering speed also lowers torque but the rpm
can be adjusted during a test feed on some stock. This will give you
the correct rpm under load that your looking for.

Frank

--- In CAD_CAM_EDM_DRO@y..., amylknight2000@y... wrote:
> WOW, thanks for all the replies, I am surprised at the quick and
> helpful responses.. looks like I'll have to check here more often.
I
> think I'll give the treadmill motor a shot, combined with changing
> the pullies as necessary.
>
> thanks again, Lee
>
> --- In CAD_CAM_EDM_DRO@y..., "Rich D." <cmsteam@a...> wrote:
> > Chris,
> > These are new DC permag motors (large) with a K&b Electronics
> > killer controller. This gives tons of torgue over the entire speed
> range.
> > Like I said, I am using these all day long. This is modern stuff,
> not old
> > shunt wound SCR stuff. The new full wave triac controllers are
> unstoppable!
> > No transformers. Straight AC to DC control.
> > It is advisable to still use the gear or belt changes for speed or
> torgue
> > needs as the requirement arises. Typically I stay at one selection
> at all
> > times.
> > RichD
> >
> > > > Lee,
> > > > The "treadmill motor/controller" set sold at Surplus Center
> > > > 800-488-3407 p/n 10-1806 at $49.95 (No web site)
> > > > is a great choice for this. I have a drill press and a
> Bridgeport
> > > > mill converted to DC and love it.
> > > > These are industrial 90VDC PM units with full speed range and
> feedback
> > > > for torgue. You will have to fab a mounting method as the
frame
> is not
> > > > standard.
> > >
> > > If I remember correctly the treadmill motor develops its maximum
> power
> > > at a substantially higher RPM than the typical 1725 rpm of the
> typical
> > > 60 hz AC induction motor typically used on a machine like this.
> > > Variable speed motors aren't great at putting out torque far
below
> > > their designed speed. What I think he really needs is some more
> reduction
> > > between the motor and spindle.
> > >
> > > But maybe someone has had acceptable results with the treadmill
> motor and no additional reduction.
> > >
> > > Chris
> > >