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 22:19:29 GMT
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Original-From:
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steve <sjbaker1@airmail%ihatespam%.net>
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Viewed:
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3658 times
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raj wrote:
> 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?
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 opponent's pulling being transferred to
the drive wheels of the robot.
> - 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?
I'd guess they are about right - I've geared things up to around that
range and twisted axles.
Also - there starts to become a definite safety risk - you don't want to
get your kids fingers into anywhere with that amount of torque!
It seems odd that you could build something really dangerous out of Lego
but it's definitely possible when you start gearing things down that
much!
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Message has 1 Reply:
 | | Re: Newbie needs Help
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| (...) Steve, Provided that my robot doesn't tip-over and that only the front wheels are driven. I have seen a video of a robot in last year's competition that opened up into a V-shape. The angle between the arms of the V being greater than 90 (...) (18 years ago, 6-Jun-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: Newbie needs Help
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| (...) 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 (...) (18 years ago, 5-Jun-06, to lugnet.robotics)
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