Subject:
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Re: Rack and Pinion Steering and idea for precise angle of rotation detection
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 9 Dec 1999 22:19:05 GMT
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Original-From:
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The WordMeister <DWILCOX@WORDSMITHDIGITAL.COMnomorespam>
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Viewed:
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684 times
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I haven't been reading this list _that_ long, but will carefully look at the
assembly tonight to see if it is putting particular stress/deformation on
anything..
I don't believe that it is vital to have the axles line up this way. The
movement of the wheels while turning describes an arc--small, but enough to
actually have the wheels rotate slightly while the assembly turns.
Also not in the scan is a 1x1 stud, 3x1 plate, and second pivoted shaft
embedded in a 2 x 2 brick I added below the double-bored bricks to keep the
wheels from falling off so easily.
Thanks [all] for the comments/attention. I hope to actually have some NQC
code up soon for subroutines to drive this puppy. As I think I've mentioned,
a steering mechanism of this type isn't actually the "best" for a small
double-motored robot, but it has a "coolness factor" that was hard to pass
up.
--Doug Wilcox
From: dave madden <dhm@mersenne.com>
To: lego-robotics@crynwr.com <lego-robotics@crynwr.com>
Date: Thursday, December 09, 1999 4:53 PM
Subject: Re: Rack and Pinion Steering and idea for precise angle of rotation
detection
> =>> On it (http://www.wordsmithdigital.com/mindstorms/rack-and.htm) is a • scan
> =>> and detailed description of my (at last) finally-successful • implementation
> =>> of a rack-and-pinion type of steering mechanism...
>
> I just looked at your pictures, and I wonder if the way you've got the
> final axles mounted (1x2 gray 2-hole beam, studs into side of 1x6
> yellow 5-hole beam) is OK. I seem to recall reading somewhere that
> the parts fit that way, but that the mating caused deformation of
> either the studs or the holes if left for a long time.
>
> Does anybody else remember that passage? Or am I just inventing
> excuses for why I didn't think of this nice solution? :-)
>
> d.
>
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