Subject:
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Rack spacing problem
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Newsgroups:
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lugnet.technic
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Date:
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Mon, 6 Nov 2000 15:13:10 GMT
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Viewed:
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590 times
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I have a technic problem that I would like to put out for advice. I am
trying to drive a sliding "carriage" via a 24t gear over a rack. Something
like this:
worm ---- motor
24t gear
rack
That is, the motor drive the worm overhead. The worm engages the 24t gear
(which drives a differential, but that is not part of the problem). Now I
want this entire upper assembly to move linearly. So I put a rack below it.
The problem is that I can't get the rack and gear to mesh at the proper
spacing. It seems like it is 1/2 plate thickness off. How can I get that
proper spacing?
As a side problem, the spacing is also a function of the sliding parts
contact. That is, whatever the solution is, it has to allow the upper
assemly to slide over the fixed assembly for at least one rack length (about
an inch).
I am open to other ideas for a linear drive, but I need the gear-down
inherent in the worm. Any ideas or pointers appreciated.
--Jack Gregory
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Message has 1 Reply:
 | | Re: Rack spacing problem
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| I've done this lots of times, but I don't know if I have any pictures. It takes some fiddling to get these to mesh smoothly. One trick you can use is to lug connect beams at right angles to your assembly. This lets you use the spacing difference (...) (24 years ago, 6-Nov-00, to lugnet.technic)
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