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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Tue, 22 Jul 2008 12:02:41 GMT
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Viewed:
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9291 times
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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.
--
Brian Davis
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Message has 3 Replies:
 | | Re: Worm gear... whence the length?
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| Hi Brian, (...) I have used thin slices of LEGO corrugated tubes as washer for that. Works fine, but I can't guarantee it would work for a long time without wear... Philo (16 years ago, 23-Jul-08, to lugnet.robotics)
| | | Re: Worm gear... whence the length?
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| (...) 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 (...) (16 years ago, 23-Jul-08, to lugnet.robotics)
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