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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Date:
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Fri, 3 Apr 2009 17:51:12 GMT
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Viewed:
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20515 times
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On Fri, Apr 3, 2009 at 1:18 PM, Eric Albrecht
<blakbird11.nospam@comcast.net> wrote:
>
> In lugnet.technic, Rafe Donahue wrote:
> > I have (supposing studs up) a horizontal axle with a standard worm gear
> > (4716)
> > on the axle. 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.
>
> Technic worm gears are not really made to mesh with the 1x4 racks. The
> problem
> is that the racks do not have any pitch (the gear teeth are perpendicular to
> the
> longitudinal axis of the rack). The worm gear, by definition, does have a
> pitch. In order for them to mesh without binding you would want the rack
> teeth
> to be inclined at an angle to match the worm gear pitch angle.
Rafe,
Must the worm gear mesh directly with the gear rack? Or, could you
put a 24tooth gear in between? (worm->24->rack)
Steve
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Message has 1 Reply:
 | | Re: Help needed on gear spacing, and another question
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| (...) 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 (...) (15 years ago, 3-Apr-09, to lugnet.technic)
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Message is in Reply To:
| | Re: Help needed on gear spacing, and another question
|
| (...) Technic worm gears are not really made to mesh with the 1x4 racks. The problem is that the racks do not have any pitch (the gear teeth are perpendicular to the longitudinal axis of the rack). The worm gear, by definition, does have a pitch. In (...) (15 years ago, 3-Apr-09, to lugnet.technic, FTX)
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