aussie_bloke wrote:
Answering Gary's question yep that motor is from a RC car, I thought with a heavier spindle a faster motor would be better to drive it. It has a resistance of about 4.5 ohms so it would draw about 2.67A when run from 12V going by the I=V/R formula.
Yes well that pretty much explains everything.
In truth there is no reason you can't use the motor as long as you design for it's characteristics - high starting current and high speed. As Steve mentioned these are normally driven from PWM circuits (normally referred to as ESCs "Electronic Speed Control"). You can buy these quite cheaply now but I don't have enough knowledge to advise you on it as yet. I actually took advantage of the high ozzie dollar and free shipping to buy a brushless motor and a corresponding ESC with the though that they might be adaptable to NBTV as the brushless motors are effectively synchronous motors which are ideal for NBTV use - alas I think I am about a year away before I can get back into NBTV seriously.
At the very least the high speed of this motor does imply that it needs a reduction system.
If you have a flat belt (like you often find in a cassette or cartridge player) you could try it just running on the motor spindle itself. A little bit of rubber tubing on the spindle would be even better to prevent slippage. In addition you can use the pulleys you have that don't fit by either shimming them out (if too large) or drilling them out (if too small) - the same applies to the other pulley.
Having said all that MY recommendation would be to use a cassette motor (with the internal speed control disabled) as a direct or belted drive - they have been used on numerous occasions just for this purpose (using a record as the disk). Belted is best for additional torque but that can lead to slippage too if you are not careful.
Good luck.