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#1
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Re: Burning the FP's
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#2
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Re: Burning the FP's
Yep, you gotta gear that F-P motor down quite a bit to make it useful. We are gearing one of ours down by 894:1, which is 7x the reduction of the F-P gearbox alone.
Andy B. |
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#3
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Re: Burning the FP's
Yeah, right now we are gonna use a two stage sprocket set up to gear it down. First will be about 2:1 second will be 4.5 to one. In addition to the FP gearbox. Thats...... somewhere in the vicinity of 1100:1. Then multiply nine times 40 foot pounds (the supposed torque of the FP motor) and our arm should theoretically have about as much torque as some cars.
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#4
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Re: Burning the FP's
We tried two stock FP Gearboxes with an additional 6:1 reduction (180*6= 1080 total reduction) and it powered our 7 lb, ~4.5 ft arm but drew 30 Amps each when 13 lbs were loaded at the end of the arm. See attached pics #297 & #303.
Not a good scenario for those FP's - design it so they don't have to draw more than 15-20 Amps at full load, otherwise they just might not last. We made a new transmission that has 260:1 reduction (see attached pic #311) and then the additional 6:1 for a total of over 1500:1 reduction. Hopefully this will keep the motors in tip top shape and we still get a couple ft/sec at the end of the arm. |
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