Subject:
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Re: Newbie needs Help
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 5 Jun 2006 16:47:24 GMT
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Viewed:
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3021 times
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> One major key to making a good Tug-of-War robot will be making it go the
> "right"speed. If it goes too fast, some of the "power" will be wasted on
> speed. If it goes too slow, it won't use all the power it has.
> To change the speed of the robot, adjust the size of the wheels, and/or the
> gearing between the motors & wheels.
> When you hold the robot in place, the wheels should still spin. If they
> don't, the robot is too fast. It's harder to tell if the robot is too slow.
> The "right" speed will change with the weight of the robot, and the surface
> it's driving on. You should find out what surface will be used, and have
> your son do as much testing as possible to find the best speed.
> That's a crash course. Good luck... :)
> Questions?
> Steve
Steve,
Thanks for the tips and good wishes. Currently this is what we have:
- 3 wheels driven by 3 motors. Each geared down at 15:1
- the wheels do keep spinning when the robot is held in place
- very generous size limit, a 250mm cube - so no problem there
- weight limit is imposed indirectly by being limited to one set of 9794
Problems/questions:
- even after 'loading' the robot with the entire set (IR tower too!), there
is insufficient weight for the torque available. No way around this is
there?
- roughly at what gearing ratio are you at risk of breaking gears and axles?
FLL literature mentions 125:1 as probably too much. What would be 'extreme'
and still safe?
Raj
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Message has 2 Replies:
 | | Re: Newbie needs Help
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| (...) I suspect you're far from breaking gears or axles. However, keep in mind it is always possible (so don't blame me if it happens) :) Keep the distance between gears & wheels small, so the axles don't twist. Sounds like you still have more (...) (18 years ago, 5-Jun-06, to lugnet.robotics)
| | | Re: Newbie needs Help
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| (...) Well, I'm not exactly an expert - but it seems to me (if the rules allow it) that attaching the tow rope above the center of gravity of the robot and putting the drive wheels at the end nearest your opponent would result in the force of your (...) (18 years ago, 5-Jun-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: Newbie needs Help
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| (...) Raj One major key to making a good Tug-of-War robot will be making it go the "right" speed. If it goes too fast, some of the "power" will be wasted on speed. If it goes too slow, it won't use all the power it has. To change the speed of the (...) (18 years ago, 5-Jun-06, to lugnet.robotics)
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