Quote Originally Posted by A_Camera View Post
True, with that simple controller it is much better than three power drill motors. Also more torque even at slow speed.
I have ordered or already have everything for the DC and Stepper builds.
They both have merits :
The stepper build linked to an arduino program will be good for taking the roughed out semi-sphere to an unpolished perfect sphere. I can set the program to speedup gradually and shift the rotational direction. More torque is required because it tends to grab when rough.
But it takes more parts and is a more expensive build. You have to have 3 controllers , flexible adapters and chucks.
The cordless drill version is good for the high speed polishing where torque is not a huge issue, it can also be controlled with an arduino and has a built in gearbox / chuck. Its also a cheaper build, 1 power supply and a single controller. Bit more cooling needed if there is no built in fans.
If .. and I say if ! I get them both working I'll do a vid and some pics.