Advice please : Quick voltage and amps question + speed control

[A_Camera]

http://hobbycomponents.com/motor-dri...-motor-drivers

But not very complicated as the above linked product has already been suggested, it's as complex a motion controller as is required, as the occasional lost step isn't an issue one pulse generator could be used for all three drivers - Simples! ;-)

- Nick

True, with that simple controller it is much better than three power drill motors. Also more torque even at slow speed.

[Fivetide]

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.

[A_Camera]

Yes, the stepper solution is a bit more complicated and more expensive. BTW, rotation direction change with a cordless drill motor is very easy, just switch the polarity on the motor you want to change the direction. Looking forward to see the vid.

[Fivetide]

Well it worked , thanks guys, pretty simple in the end with your help..anyway a vid .. sounds like a jet engine taking off lol :)

[magicniner]

Cool, good to see you have something running, now we just need to see them working on your spheroids ;-)

I know it looks wrong but the other options were worse! :D