Subject:
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Re: Competitive MINDSTORMS: Now in a store near you!
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 19 Aug 2004 19:20:02 GMT
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Viewed:
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1149 times
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In lugnet.robotics, David Perdue wrote:
> Brain-Bot has a fast speed of 1:15 and a slow speed of 1:75
By "speed", do you mean those are the gear ratios? What is the mass and wheel
radius for Brain-Bot? And how many driving motors does it use (i.e., how many
motors actually apply torque into the drive train, as opposed to shifting gears
for instance)? A 75-to-1 torque increase would (assuming 6 Ncm from each of two
standard gear motors, about what they stall out at) yield a wheel axle torque of
*900* Ncm, much much more than is needed for *any* of the LEGO wheels (even the
Power Puller's) under reasonable weight constraints. Help me out here, I must be
missing something as well.
Any chance you could bring ZR1 or any of the other 'bots from your book to
Sumo 6 in Ann Arbor? I'd love to see how they work, and in general the 24tooth
events have been a very good time for all.
--
Brian Davis
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Message has 1 Reply:
 | | Re: Competitive MINDSTORMS: Now in a store near you!
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| (...) 1:15 and 1:75 are, in fact, the gear ratios. I achieved these ratios not by the rotations--for instance, an 8t gear turning a 24t would result in a 3:1 ratio--but by counting the teeth--for instance, an 8t gear turning a 24t gear would result (...) (20 years ago, 20-Aug-04, to lugnet.robotics)
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Message is in Reply To:
| | Re: Competitive MINDSTORMS: Now in a store near you!
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| (...) Hi Steve, I think I see where you're getting confused. Summed up, some of the concepts presented in this chapter build upon Chapter 6 in Competitive MINDSTORMS, so it's important to understand the concepts in that chapter before reading the (...) (20 years ago, 19-Aug-04, to lugnet.robotics)
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