Too_Many_Tools wrote:
Hi,

Nice catch on the surface grinder.

Thanks. I hope it works out. I've bought multi-hundred pound lumps of
scrap cast iron for dollars per pound before.


As for swapping out its current motor, I would be VERY hesitant on
doing that. Any surface grinder worth having has a balanced
(expensive) drive motor. Any old DC motor will not be balanced and you
will be setting yourself up for alot of hair pulling trying to figure
out what is wrong with your finish. Experience speaking here...

Yeah, that's occurred to me as well. Reading the Sanford blumf

(thanks Don !)

there are frequent references to "precision balanced motor". One reference,
marketing crap .. numerous references, a guy might want to pay attention.


If you do finally put a suitable DC motor on the grinder, pay
attention to the no load RPM of the motor you use. We wouldn't want
you or your new grinder scratched with an exploding wheel when the
motor exceeds the RPM rating on the wheel in a no load situation.

Starting to look like a last resort. If I do it, some sort of flywheel will
be part of the solution, as well as tach feedback for speed control.



Good luck with the effort and keep us informed as to the CNC effort.

I will.

Frankly, I'm surprised more people haven't done this with manual machines.
I wonder if I'm missing something here, or if I'm just the laziest guy
around.

( Don't ask my wife, I know how she'd vote. )

Alan