On 9/19/2019 9:31 AM, dpb wrote: On 9/19/2019 11:14 AM, Pirate6093 wrote:
replying to Bill, Pirate6093 wrote:
You may be applying to much presser. That will give it a burnt finish.

(For context from the original post this is 12" disc, not hand
sander--dpb)

They run too fast for anything but the lightest of pressure and briefest
of contact in one place...MUST keep the workpiece moving.

Some woods (cherry perhaps most notoriously) are far more prone to
burning than others, too, of course.

--


If its an HF type bench sander with a cheap universal brush motor you
might be able to slow it down (with a significant loss in power) with an
external router speed control. If it a single phase AC induction motor.
Nope. Sorry. Light momentary pressure or maybe only sanding near the
center where the surface speed is less are your only cheap easy answers.

Of course you can always change it out to a DC treadmill motor with
square pulse speed control or a 3 phase motor with a VFD for speed
control. Both are popular on shop built belt grinders. No reason they
won't work on a disc sander.