Subject:
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Re: Worm gear... whence the length?
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 23 Jul 2008 21:09:08 GMT
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Viewed:
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9753 times
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In lugnet.robotics, Brian Davis wrote:
> In lugnet.technic, Mark Bellis wrote:
>
> > If you're struggling with worm gaps for your leadscrew, this pic of my crane
> > worm gearbox might help... I also found that 5 worms and a 14-tooth bevel
> > gear fits on a 12-stud axle with axle extenders at either end.
>
> Thanks Mark - those are nice designs. In my case I needed the precision, but I
> also needed a very compact implementation *and* it had to mount to an NXT motor:
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=3299407
>
> I'm pretty happy with the design, but the slop really needed to be compensated
> for in either "over-throwing" the position or by having the program adjust the
> limits based on the current position as well as the goal position (I'm using it
> to throw a very small sliding switch on the back of a camera):
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=3230407
>
> > Some of the old, discontinued parts provide odd measurements that
> > are very useful when we do precision engineering!
>
> Agreed. But only if you have them :). I wish I could have used the 8t gear in
> place of the half-bushings, but there wasn't enough clearance between the
> mechanism and the camera body.
Hi Brian,
obviously you are working hard on Nadar 2.0 :)
Also read about your Little Joe free-fall on H.A.L.E and I wish you very good
look with that! ;-)
Two NXTs in one single mission is of great courage...
For the worm gear issue I also believe it would have been possible to slightly
extend the pitch to achieve the worm exact two studs length, without impact on
the existing gears.
So I fully agree with David when he wrote "The only reason that the worm gear
had to be made a tiny bit less than 2 studs long was so that when you put it
between two TECHNIC bricks, it won't bind."
BR,
Fernando
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Message is in Reply To:
 | | Re: Worm gear... whence the length?
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| (...) Thanks Mark - those are nice designs. In my case I needed the precision, but I also needed a very compact implementation *and* it had to mount to an NXT motor: (URL) pretty happy with the design, but the slop really needed to be compensated (...) (16 years ago, 22-Jul-08, to lugnet.robotics)
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