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Unread 25-02-2004, 00:05
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Re: WHich motor to lift and for arm

Quote:
Originally Posted by J Flex 188
van door to lift, denso/window the manipulate the grabber.

rest of it = drivetrain
will we need a ratchet on the van door?
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Unread 25-02-2004, 00:58
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Re: WHich motor to lift and for arm

Yes you will. Or some other device to stop it from backdriving and blowing its worm gear.
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Unread 25-02-2004, 01:03
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Re: WHich motor to lift and for arm

Our will stop without the ratchet. We will probably add one anyways though. Our winch diameter is <5/8" though. Small diameter helps.
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Unread 25-02-2004, 10:16
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Re: WHich motor to lift and for arm

Quote:
Originally Posted by ngreen
Our will stop without the ratchet. We will probably add one anyways though. Our winch diameter is <5/8" though. Small diameter helps.
Ours is exactly 5/8" and a combination of that and the adjustment screw and the van door motor doesn't back drive. It all depends on how fast you want to go, how much energy you want to use, and how complex you want your system to be.
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Unread 25-02-2004, 10:20
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Re: WHich motor to lift and for arm

our winch is directly connected to the drive train, so we have 2 drills and 2 fischer prices running it. those have more power than the van door, but stealing power from the wheels requires a lot of planning and is probably not something you can add on at this point
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Unread 25-02-2004, 10:34
Andy Brockway Andy Brockway is offline
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Re: WHich motor to lift and for arm

I would suggest that you look in the White Papers technical section for the papers on motor selection. Ken Leung has done a nice job of compiling info from Joe Johnson and others that will let you select a motor and gear ratios to keep from smoking motors. The key is determinig the Power you need first and then adjusting the motors to get the required torque.

The examples can be used as 'recipes' for lifting balls and robots. We used these notes this past year to select dual Fisher Price gearboxes to lift twice the weight of our robot straight up in under 10 seconds. We have not tested the twice the weight yet but it gives us a good safety factor.
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