Subject:
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Re: I wish Lego made an "Anti-Backlash Gear"
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 3 Apr 2001 13:49:23 GMT
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Original-From:
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John Barnes <barnes@sensorsNOMORESPAM.com>
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Viewed:
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5717 times
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Eric Sophie wrote:
> Tech question for us: Any body know what an Anti-Backlash gear is? If Lego
> made one, we would all have super precise Robots and mechanisisms! BERG
> carries them... Anybody know what I'm talking about?
I have done quite a lot of experimentation to limit backlash in certain
situations.
First of all, it is quite easy to make little shims from the yellow plastic
material
the parts are seperated into in new sets. I make ones with 0.2" holes in
the center
0.3" outer diameter. These can be placed behind bevel gears to improve the mesh
and get less backlash.
In the case of the rectagular blocks which are worm gear boxes, you can
trap one
of these washers at one end of the worm. This reduces slop in the worm position
and really improves the resultant output shaft firmness.
In simple mechanisms like scanning devices, try loading the drive train
with a rubber
band. This will keep all the teeth meshing biased and increase the accuracy at
the expense of maximum torque of course.
JB
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Message has 2 Replies:
 | | Re: I wish Lego made an "Anti-Backlash Gear"
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| Interesting point about the rubber bands vs the resultant torque loss, it is true that the opposing forces on the gears along with the "rubber pull" will tender them to one direction or another in concert... However,...and I say this kindly and (...) (23 years ago, 3-Apr-01, to lugnet.robotics)
| | | Re: I wish Lego made an "Anti-Backlash Gear"
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| >>>>>> However,...and I say this kindly and jokingly, ....Cheater!!! You experimented (cheated) with washers of a sort, gaaa.. <<<<<< Hey! real engineering uses shims (not washers ;) And I can honestly put my hand on my heart and say everything in (...) (23 years ago, 3-Apr-01, to lugnet.robotics)
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