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Unread 08-02-2008, 10:33
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Re: Need motor suggestions

The first step might be to calculate the load of the arm, and then divide by the reduction to find out what torque the motor needs to have. Also you should keep in mind that the "stall torque" is the maximum torque the motor can produce, it is NOT the torque that the motor is designed to operate at. Normal torque load should be about 10 to 25% of stall torque. If you have a long arm with a ball gripping device on it as well as the weight of the ball, you may find that if you want the arm to move anywhere near fast, you'll need to use the CIM motor on it.

Also look at using a gas spring (available from McMaster-Carr among other sources) to help hold up the arm. This may or may not help...but last year it let us use a small motor driving a long arm to play Rack-N-Roll.
 


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