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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Tue, 6 Jun 2006 23:17:41 GMT
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Viewed:
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3915 times
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In lugnet.robotics, Dave Curtis wrote:
> > something that raises your end of the tow rope above your
> > oponent's end. Then the act of pulling exerts a downward
> > force on your robot and an upward force on your opponent's.
>
> Ummm.... that's not the way I remember the mechanics. There
> is a torque created that is force on the drawbar times the
> drawbar height from ground.
I don't think Dean was talking about torque from the rope tipping the robot;
I think he was talking about the fact that a raised attachment point for the
rope can result in a downward component of the tension, increasing the force
down on the robot and thus potentially increasing the force of friction.
> That torque will lift your front end.
The torque from the rope tension can certainly reduce the downward force at
one end of the vehicle, but it can increase it at the other - you want the
driven wheels where the downward force is increased.
I can do the force analysis - but in the end, you try a bunch of ideas to see
what works. There's a reason you don't employ a physicist as an engineer.
--
Brian Davis
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Message has 2 Replies:
 | | Re: Newbie needs Help
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| (...) Sure, I understand the argument. But this old farm boy has both a few hours in the driver's seat of a farm tractor, as well as a couple of engineering degrees, both of which prompted my cautionary statements. Let me start by saying that I (...) (18 years ago, 7-Jun-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: Newbie needs Help
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| (...) Ummm.... that's not the way I remember the mechanics. There is a torque created that is force on the drawbar times the drawbar height from ground. That torque will lift your front end. Doubling your own drawbar height halves your pulling (...) (18 years ago, 6-Jun-06, to lugnet.robotics)
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