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My pulleys are going to be rotated with a 1000-2000 RPM motor, with a constant RPM controlled by a hall effect sensor, there is going to be almost no torque as one of the pulleys just has a 100 gram optical element attached to it and all the pulleys are on bearings.

Any suggestions on choosing v belt or circular belt? Price is pretty similar and v seems to reduce risk of slipping and has better grip. Cant find a disadvantage of v belts.

I just assume slippage might become in issue with round belts at these RPMs if there isn't enough grip, no other reason to not choose them over v belts, really.

I'd imagine tooted belts wouldn't provide much advantage here besides any backlash or slippage when the system begins rotating but I don't see how it would be more precise after the speed is reached and the speed and load remain constant during operation.

Mark Legault
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Depends on many things. For example I have sometimes used round belts for these applications simply because i happened to have suitably sized O- rings which i could use as belts and didnt have V- belts around. This means i could have a working version today, instead of in a day or two. *

The groove for a round belt may be minimally easier to manufacture with a manual lathe. Also the round belt is slightly easier to install if you do not use a tensioner mechanism as its possible to roll it into place.

Remember that your feedback should come from the final axis thisway it hardly matters if your belt slips. Slippage may be minimal anyway, but if you are really concerned use a toothed belt instead.

* dont underestimate this, as you may end up doing some higher priority work in future. But then if you do not need to concern yourself with assembly and manufacturing choose what you think is best.

joojaa
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