Subject:
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On the Subject of Treads
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 30 Aug 1999 14:39:52 GMT
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Original-From:
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John Barnes <BARNES@SENSORS.nospamCOM>
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Viewed:
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450 times
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I note with interest, the discussion relating to using treads
for building a climber. I have a preliminary question before
going further with a technically challenging problem like this.
Has any one used treads to make a simple crawler that really
works properly?
I have failed a number of times. What I observe is that the
treads slowly precess relative to the cogging on the tread
wheels. Then, the ribs on the inside surface of the tread
"climb over" the ribs on the tread wheels. This causes a big
increase in friction, and is not acceptable. I have tried to
construct devices using treads as conveyors, with the same
result. I have tried different tensioning schemes, but nothing
seems to help.
Does anyone know how to get around this?
I have noted that driven treads, ie; motorless toy being pushed
never does this, but motorized ones, with driven treads always do!
JB
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 3 Replies:
 | | Re: On the Subject of Treads
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| (...) I have never tried this, but maybe you could build a frame around the tank tread so that the tread doesn't work itself off the wheel. You could run two technic beams along the side of the tread so that it doesn't shift from side to side. It's (...) (25 years ago, 30-Aug-99, to lugnet.robotics)
| | | Re: On the Subject of Treads
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| Hi John - - I've been using a tracked LEGO 'bot since November as a sensor test-bed without any difficulty (and with out rebuilding the track system) on an almost daily basis. See the Mindstorms Constructopedia pg. 39 for a basic idea. The axles DO (...) (25 years ago, 30-Aug-99, to lugnet.robotics)
| | | Re: On the Subject of Treads
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| In lugnet.robotics, lego-robotics@crynwr.com (John Barnes) writes: [snip] (...) I have indeed seen this before, on at least three different LEGO Technic (including one RIS) kits. Its a flaw in the treads, not anything that you are doing wrong. I (...) (25 years ago, 30-Aug-99, to lugnet.robotics)
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