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glatt · 10-22-2012, 09:43 AM

This motor looks promising.
http://www.amazon.com/Wondermotor-Va...lectric+Motors

It comes with the speed controller knob attached to a foot long wire, and it's reversible depending on how you wire it. But you could add a switch to make it reversible at the flip of a switch.

At a max speed of 50 RPM it seems perfect. You wouldn't be able to follow a spinning disk with your eye any faster than that. If you have an old turntable, you should follow that with your eye to see what 45RPM looks like.

It's a little expensive, so if you got it and the variable speed wasn't as smooth as you wanted, you would be out $90. But it has some kind of mounting holes, which is nice, and it's fairly powerful, so you wouldn't be taxing it too much. They suggest a $17 power supply that goes with it. With that power supply, you would plug it into the wall.

I don't know enough about electronics to know what that controller is like. I don't know what pulse width modulation means. But I'm guessing you turn the knob to turn it on and then turn it more to make it go faster, up to 50 RPM. It's got a 10 MM drive shaft (1 cm) which is nice and big to work with. Many small motors have these little drive shafts, and how are you going to mount a big disk to those?

10-22-2012, 09:43 AM	#20
glatt ™ Join Date: Jul 2003 Location: Arlington, VA Posts: 27,717	This motor looks promising. http://www.amazon.com/Wondermotor-Va...lectric+Motors It comes with the speed controller knob attached to a foot long wire, and it's reversible depending on how you wire it. But you could add a switch to make it reversible at the flip of a switch. At a max speed of 50 RPM it seems perfect. You wouldn't be able to follow a spinning disk with your eye any faster than that. If you have an old turntable, you should follow that with your eye to see what 45RPM looks like. It's a little expensive, so if you got it and the variable speed wasn't as smooth as you wanted, you would be out $90. But it has some kind of mounting holes, which is nice, and it's fairly powerful, so you wouldn't be taxing it too much. They suggest a $17 power supply that goes with it. With that power supply, you would plug it into the wall. I don't know enough about electronics to know what that controller is like. I don't know what pulse width modulation means. But I'm guessing you turn the knob to turn it on and then turn it more to make it go faster, up to 50 RPM. It's got a 10 MM drive shaft (1 cm) which is nice and big to work with. Many small motors have these little drive shafts, and how are you going to mount a big disk to those?