Subject:
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Re: Recipricating motion problems
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 30 Nov 2000 19:41:55 GMT
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Viewed:
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815 times
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This is a little short of 90 degrees.
http://www.geocities.com/Heartland/Bluffs/7900/cam1.jpg
http://www.geocities.com/Heartland/Bluffs/7900/cam2.jpg
http://www.geocities.com/Heartland/Bluffs/7900/cam3.jpg
Bob Fay
rfay@we.mediaone.net
The Shop
http://www.geocities.com/Heartland/Bluffs/7900/
http://users5.50megs.com/bobfay
California
USA
"Jason Stern" <2busytobe@home.com> wrote in message
news:3A2687F4.B935682C@home.com...
> sorry but you lost me, whats a cam? If you mean an off center 40 tooth • gear, i
> already tried that but it didn't work. i could get it to turn th other , • but i
> could get it to turn it back again
>
> Jason
>
> Bob Fay wrote:
>
> > You need gears or a cam that allows an adjustment in the distance from • the
> > centerline of the shaft. A 24 tooth gear and a 40 tooth gear would allow • you
> > to accomplish such action. I find the cam is very useful as the driven
> > element. You can always place a cam on the shaft with the reciprocating
> > gear to allow some further adjustment.
> >
> > --
> > Bob Fay
> > rfay@we.mediaone.net
> >
> > The Shop
> > http://www.geocities.com/Heartland/Bluffs/7900/
> > http://users5.50megs.com/bobfay
> > California
> > USA
> > "Jason Stern" <2busytobe@home.com> wrote in message
> > news:3A265EF8.A88E7AE0@home.com...
> > > I have two 24 tooth gears. The lower gear is one hole down, six holes
> > > over from the upper gear. Like so (the @ are where the center of the
> > > gears are):
> > >
> > > @
> > > @*****
> > > ^1 2^
> > > I need to make it so that by turning gear 1 continusaly, in only one
> > > direction, gear 2 turns a 1/4 turn, and the goes back to the starting
> > > position (ie gear 2 turns 90 degrees clockwise, then turns 90 degrees
> > > counterclockwise. it can not turn back through use of a rubber band, • the
> > > rotating must come soley from gear 1, which is turning in only one
> > > direction) How could I go about doing this? What I have been trying so
> > > far is to use an axle like those on a train, with one end of the axle
> > > attach to one of the holes in gear 1 and the other end attached to one
> > > of the holes in gear 2. So far i have gotten gear 2 to rotate 45 and
> > > back and i have gotten it to rotate more than 90, but not back (not • sure
> > > by how much it over rotated, after 90, the gear hits stuff and can't
> > > rotate anymore, so it stops moving, and stops gear 1 from moving,
> > > grinding everything to a halt) I have only tried a few combinations of
> > > axles and connectors with the gears, but rather than go through all of
> > > them (there must be at least a hundred!), has anyone done this before
> > > and gotten it to work? Does anyone have any other suggestions how i
> > > could do this?
> > >
> > > Jason
> > >
> > > P.S. If this confuses you, I have an mlcad that shows how it is • supposed
> > > to work. Drop me a line and I'll send it to you.
>
>
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Message is in Reply To:
 | | Re: Recipricating motion problems
|
| sorry but you lost me, whats a cam? If you mean an off center 40 tooth gear, i already tried that but it didn't work. i could get it to turn th other , but i could get it to turn it back again Jason (...) (24 years ago, 30-Nov-00, to lugnet.robotics)
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