LEGO TECHNIC : 16387


Technic / 16387	16386 \| 16388

Subject:	Worm gear... whence the length?
Newsgroups:	lugnet.technic
Followup-To:	lugnet.events.brickworld, lugnet.robotics
Date:	Sat, 19 Jul 2008 14:01:53 GMT
Viewed:	14004 times

OK, after struggling with precision in a lead-screw assembly for quite some time now, I've just got to ask because I don't know the answer and it's bothering me... Can ANYBODY give me a possible good reason for the length of the worm gear? why oh why couldn't LEGO have made it exactly 2 units long, instead of 1-point-almost-two-units long?!? That slight slop can really complicate things. Yes, I know about pre-loading things, gearing down, etc. - I'm just wondering if there is a fundamental mechanical reason why they couldn't have increased the pitch very very slightly and extended the worm gear very very slightly. Wouldn't that have worked? -- Brian "looking for answers" Davis

Message has 3 Replies:

		Re: Worm gear... whence the length?
(...) The number of thread has to be an integer. If not, you could not been able to use multiple worm gear on a same axle. And the thread pitch is determined from the straight gears pitch. (which is something like nPi/m studs (n,m being intergers). (...) (16 years ago, 19-Jul-08, to lugnet.events.brickworld, lugnet.robotics)

		Re: Worm gear... whence the length?
"Brian Davis" <brdavis@iusb.edu> wrote in message news:K49Az5.87G@lugnet.com... (...) The problems with the worm gear that you describe are due to the fact that it has to fit into this part in this set and others, which was designed to accomodate (...) (16 years ago, 20-Jul-08, to lugnet.events.brickworld, lugnet.robotics)

		Re: Worm gear... whence the length?
(...) Hi Brian, If you're struggling with worm gaps for your leadscrew, this pic of my crane worm gearbox might help: (URL) worm is two worms long, plus two pairs of old type (crennellated) half bushes (small pulleys) and an old type 14-tooth bevel (...) (16 years ago, 22-Jul-08, to lugnet.technic, lugnet.events.brickworld, lugnet.robotics)

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