Calculating Linear Force from Motor Torque?

[AdamHeard]

Originally Posted by KrazyCarl92

If I am understanding the set up properly, I believe this would have the opposite effect. The set up described has an 80 tooth gear on the motor and a 40 tooth gear being driven, which results in double the speed but half the torque. Using the equations above, isn't N = 0.5?

You are correct, I assumed it was 80 on drum.

[magnets]

You can't just use a stall torque calculation for your designs. With electric motors, the torque is much less when the motor is spinning. You need to find a motor curve and estimate how fast/how much torque the motor will generate. If you're using any sort of gear reduction, you need to take into account that some energy will be lost there. Also, you need a significant safety factor.