Robotics : 27513


Robotics / 27513	27512 \| 27514

Subject:	Re: Worm gear... whence the length?
Newsgroups:	lugnet.events.brickworld, lugnet.robotics
Date:	Sun, 20 Jul 2008 01:53:52 GMT
Viewed:	2163 times

"Brian Davis" <brdavis@iusb.edu> wrote in message news:K49Az5.87G@lugnet.com... > 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. 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 the current worm gear: http://www.bricklink.com/catalogItem.asp?S=8485-1 Released as early as 1995 in set 8485 and other Technic sets which came out, there was the following new worm gearbox: http://www.bricklink.com/catalogItem.asp?P=6588 > 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? What you describe isn't possible due to the fact that LEGO would have to completely redesign and cut an existing part mold to accomodate a very slight change to another part mold. This simply isn't going to happen unless it reaches it's end-of-production lifecycle, and given that it isn't used very often in sets, it's not going to change anytime soon. Cheers ... Geoffrey Hyde

Message has 1 Reply:

		Re: Worm gear... whence the length?
(...) That would make sense, but for the fact that the worm gear is ten years older than the gearbox that you cited. 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 (...) (16 years ago, 21-Jul-08, to lugnet.events.brickworld, lugnet.robotics)

Message is in Reply To:

		Worm gear... whence the length?
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 (...) (16 years ago, 19-Jul-08, to lugnet.technic)

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