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"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
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Message has 1 Reply:
Message is in Reply To:
 | | Worm gear... whence the length?
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| 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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