Subject:
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Re: Friction Pulley question
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 24 Jan 2000 23:21:39 GMT
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Viewed:
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1357 times
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Unfortunatelly I don't have a clutch gear. It's hard to find and I can't
order kits with it outside US. :(
Pulleys and clutch gears can solve the problem but they requires more space.
I really don't know if the friction pulley was designed for that (I believe
it wasn't!) but if it fits it could be a very compact solution to this
problem. It takes much less space than pulleys and clutch gears.
I did one experiment and I was partially successful using this pulley after
a 8:1 gear reduction (wormgear to 24t, 24t to 8t gear) so that the torque
aplied to the rubber ring was much stronger. I'm using the normal motors
(gray ones that come with mindstorms), not the micromotor. I was "partially"
succesful because my testing assembly wasn't very strong and sometimes it
broke apart due to the increased torque. I'm working on it. Of course, the
gear reduction takes a lot more space than pulleys and clutch gears, but I
needed it anyway so that I can center the steering.
My concern is that such use may damage the ring so that it loses it grip
after some time.
Anyway, even if it doesn't work, a piece designed for that could be very
useful. If I can't use the original pulley, it may be possible to
"fabricate" such a piece using a original bushing, carving half of its teeth
and use silicon glue as the rubber ring. I may try that one day.
Mauro Vianna
"Ben Jackson" <ben@ben.com> wrote in message news:Fotq3n.EHD@lugnet.com...
> In lugnet.robotics, Mauro Vianna writes:
> > My concern is that I'm not sure if it was really designed to be used this
> > way. I'm afraid that it may damage the rubber ring. But I couldn't figure
> > any other use to that ring also.
>
> The rubber ring grips the stud on the micro motor. You can then use it as • a
> pulley or to connect an axle to the micro motor. They appear to grip • tightly
> enough that they never slip within the torque range of the micromotor. • Don't
> worry about ruining the rubber ring -- you'll always get a new pulley with • any
> micromotor.
>
> The right part for a limited-slip axle connection is the white clutch • gear.
>
> --Ben
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Message has 1 Reply:
 | | RE: Friction Pulley question
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| (...) ... (...) You can use the pulleys as one stage of the gear reduction setup without using any or minimal additional space. Use a small bushing for the input. Put it as close to the motor as possible. Or you could go from a small bushing to a (...) (26 years ago, 24-Jan-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: Friction Pulley question
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| (...) The rubber ring grips the stud on the micro motor. You can then use it as a pulley or to connect an axle to the micro motor. They appear to grip tightly enough that they never slip within the torque range of the micromotor. Don't worry about (...) (26 years ago, 24-Jan-00, to lugnet.robotics)
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