Subject:
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Re: Problem with auto-steering mechanism.
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 29 Oct 2002 16:07:47 GMT
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Original-From:
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PeterBalch <peterbalch@#Spamless#compuserve.com>
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Viewed:
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697 times
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Steve
> > The two wheels on the bogey are on a solid axle.
> ...well...I used a single wheel.
Hmmm. If it's a single wheel then why whould it prefer a straight line?
Why did you abandon two wheels?
> It seems to me that toy makers must have figured out something we don't
> know because their toy seem to work well on any surface - and they can't
> be too picky about manufacturing tolerances either.
I bet their drive-trains are a lot more efficient. Frictional losses in
Lego gears and axles are high.
I've never seen one with treaded or fat tyres on the bogey. Maybe that's
significant.
> you'd
> like the body to automatically straighten out so the robot follows
> along in the new direction of the front wheel instead of spinning
> around in a circle and hitting the obstacle again.
Surely that will happen if the bogey likes to go straight? Which is where
two wheels help.
> If the drive wheel is out in front of the turntable, It makes the
> body of the robot move sideways when the turntable spins.
I don't have a toy like that to experiment with. Could the drive wheel be
behind the turntable (i.e. change the drive direction)?
I've found another robot in my son's toy box:
bogey wheel dia 17mm
bogey wheel axle len 24mm
bogey axle gear teeth 10
steering ahft crown gear teeth 17
bogey to rear axle 42mm
rear axle len 60mm
rear axle not solid
so the bogey wheels are geared UP from the steering axle! Clearly the
"Mystery Bump and Go Action" contains more mysteries than I had imagined.
Peter
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Message has 1 Reply:
 | | Re: Problem with auto-steering mechanism.
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| (...) Well with all this discussion I couldn't resist trying it myself! :-) If I understand the concept correctly, the front (single) wheel is driven thru a freely rotating turntable. When the front wheel stalls due to the robot hitting something in (...) (22 years ago, 29-Oct-02, to lugnet.robotics)
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