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#1
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Re: Burning the FP's
It may or may not be too late in the season to try it, but I think this would be a good application for the Nothing But Dewalts FP transmission. You get a 47:1 reduction in the tranny, which gives you a peak power RPM of around 255. Plus you should get a lot of torque out of it. Most importantly of all, you can leave in the anti-backdrive pins, so your motor doesn't have to melt trying to hold your arm in place.
Team 57 is going with this setup for a telescoping tower for all these reasons, though we're having troubles getting the parts. The clamshells are on backorder, so we've ended up buying a drill to cannabalize the shell from. then when our backordered shell comes in, we'll have a shiny new drill for regionals. |
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#2
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Re: Burning the FP's
I wish I had read that earlier. I am beginning to worry we will burn ours trying to hold the arm up. Maybe I should put some fans on it.... Probly wont help but whatever.
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#3
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Re: Burning the FP's
FPs we're a big pain is the ASP last year for my team. This year we're using globes alone at a 10:1 reduction (I think - that's NOT my department).
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#4
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Re: Burning the FP's
gear that devil down... even if it worked with the origional 4:1 reduction, that arm is flying through the air, and when the arm+robot+tetra all runs into a brick wall, thats a lot of intertia waaaaay up in the air... we learned the hard way last year what inertia does to an arm, and what happens when intertia takes over..not a pretty sight.. the tip of our arm, fully extended, will move no faster than 16in/sec..
good luck j |
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#5
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Re: Burning the FP's
Quote:
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#6
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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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#7
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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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#8
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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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