Subject:
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Re: Help needed on gear spacing, and another question
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Newsgroups:
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lugnet.technic
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Followup-To:
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lugnet.robotics
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Date:
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Fri, 3 Apr 2009 21:46:07 GMT
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Viewed:
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20621 times
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In lugnet.technic, Steve Hassenplug <steve@teamhassenplug.org> wrote:
> > > I also have a series of rack gears (3743) that I want to engage
> > > the worm gear. I want the rack gears to sit still so that the
> > > worm gear moves back and forth on the axle as the axle turns.
>
> Must the worm gear mesh directly with the gear rack? Or, could you
> put a 24tooth gear in between? (worm->24->rack)
For instance, have a "floating" worm-gear-based gearbox sliding along that axle,
with the 8t gears engaging an external stationary rack? If the worm gear doesn't
have very far to travel, you could also substitute a rack gear or two for a
series of locked 8t gears. The rtlToronto folks did something like that to make
a nice concealed lock mechanism:
http://news.lugnet.com/technic/?n=14126
(yes, that's not exactly what you need, but it's in the right direction). As to
the spacing... well, by positioning things along an axle, any spacing you want
(or any angle you want) can be created.
As to the numbers, the 1-4 were from the Hogwarts train I think. They never made
enough passenger cars to need 5-9 (and didn't know they were supposed to start
at 0 ;) ). Engraved plates might be a possibility (I've had studless beams
engraved... perhaps a series of digits inscribed linearly along a studless
beam?).
--
Brian Davis
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Message has 1 Reply:
 | | Re: Help needed on gear spacing, and another question
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| First (zeroth?), thanks to all the information and helpful hints. I should have realized that the worm gear doesn't fit with the rack, as their pitches won't match up. That's really obvious and I should have seen that. Second, the worm -> gear -> (...) (15 years ago, 6-Apr-09, to lugnet.robotics)
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