Subject:
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Re: Mechanical pneumatic piston
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 11 Oct 2003 13:32:15 GMT
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Original-From:
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Mark H. Near <MARKN@SCOCA-K12.ORGsaynotospam>
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Viewed:
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1993 times
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Restating for clarity, (I hope)
I think the issue is the + shaped central hole.
If you mounted these worm gears on an axle which requires them to be
mounted at 0 (180), 45, 90, and 135, then of course you can't turn the
gears anywhich way to line up exactly. That is why they are a certain
length.
Now On a round, but snug axle, this would not be an issue at all, but then
you have a "clutch" and a limited amount of torque before the "clutch"
slips, and of course, the alignment is gone at that point, unless all the
worm gear stack slips together somehow.
Mark (MHN1957)
On Sat, 11 Oct 2003, Mike Thorn wrote:
> At 11:03 PM 10/10/2003, you wrote:
> > In lugnet.robotics, Mike Thorn wrote:
> > > At 10:26 AM 10/10/2003, Kevin Clague uttered the following:
> > > > The problem is that you would need a mold for each unique part that is
> > > > cut. If
> > > > the number of rotations/divided by the length does not give you length • that is
> > > > repeatable using quarter turns you need more than one mold. This is *not*
> > > > good
> > > > (very expensive), plus from a part sorting perspective, I'd need more • than one
> > > > drawer for worm gears :^)
> > >
> > > I'm not sure my brain can wrap itself around that, but I'll keep trying. In
> > > the meantime, I'll take your word for it that it won't work. :)
> >
> > I overspeaketh......
> >
> > Let me try again. The gear has to be an integer multiple of 1/4 turns because
> > the the gear can fit on an axle four different ways.
> >
> > If it is more or less than 1/4 turns (1/3), then things won't line up when you
> > butt them up to each other on an axle.
>
> Okay, I understand better now. So unless you have two worms made
> consecutively, you're stuck.
>
> Thanks! :)
>
> ~Mike
Mark
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Message has 2 Replies:
 | | Re: Mechanical pneumatic piston
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| I have given this question some thought in the past and I came up with a theory. First of all some gear geometry background. Lego gears have 8 teeth per Lego unit (aka stud) of pitch diameter, the effective diameter to where the gears mesh. Using (...) (21 years ago, 12-Oct-03, to lugnet.robotics)
| | | Re: Mechanical pneumatic piston
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| (...) With four orientations that would be 0, 90, 180 and 270. However, you could get away with eight if you have one side of the worm gear at 0, 90, 180 and 270 and the other at 45, 135, 225 and 315, you'd just need to turn around every other gear (...) (21 years ago, 12-Oct-03, to lugnet.robotics)
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