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Originally Posted by troy_573
Thxs you both for those response now i have another question we need 90 maybe 95 Ft lbs of torque can u get that with out stalling the motor using either the F-P or Van door ... preferably the Van door because the desgin is set up for the van door but switching ( back) to the F-P is not a big deal
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I'm assuming that since you did not mention the CIM motor as an option that you are using all 4 of them already.
Andy's points above about the heat problems with the FP motor are all valid. Given that, we still plan to use it to lift Tetras this year. Don't forget that counterbalancing the weight of your "arm" can really lower the amount of motor torque required to hold it in place.
Now to answer your question, we like to run our motors at 25% to 33% of their stall torque at the maximum predicted load. If that load is 95 ft-lbs for your design you would want a 3:1 or 4:1 reduction between the FP gearbox and the arm. At 25% of stall torque you will run at 75% of the free speed or 94.5 RPM. With your 4:1 reduction this would leave you with an arm speed of 23.6 RPM. At this speed it would take
about 1.3 sec for the arm to travel 180°. Maybe you want to use more than a 4:1 reduction to slow it down a little more.
Corrected a little calculation error above
Go through the same logic with the van door motor. I think that you will find the van door motor is not powerful enough to move your arm at an acceptable speed.
Matt B