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Unread 23-01-2011, 21:10
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Re: necessary torque for an arm

Quote:
Originally Posted by klmx30302 View Post
But unless your arm weighs more then 40 pounds, one rs550 with a 64:1 transmission will do just fine.
Please be careful giving advice like this. This statement is absolutely false.

The tests you linked to demonstrate 40 lbs on a 2" pulley which is 80 inch-pounds of torque. The original poster calculated that they need up to 51 foot-pounds of torque for their arm. That's 7.65 times more torque than the scenario in your video.

Quote:
Happy Birthday!

And so that system would be fine? (mind-numbing speed aside)
Thanks!

Without doing the math myself, and without any formal mechanical training, the numbers you have posted seem plausible. In addition, you may be able to lower the required torque by partially balancing the arm with surgical tubing or a gas spring.
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Last edited by Vikesrock : 23-01-2011 at 21:13.