Subject:
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Re: Does anyone have the 8479 bar code truck?
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Newsgroups:
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lugnet.build
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Date:
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Wed, 29 Sep 1999 22:27:15 GMT
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Viewed:
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419 times
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In lugnet.build, Mark Rideout writes:
> In lugnet.reviews, Frank Filz writes:
> > Matthew Miller wrote:
> > I haven't opened my Robotics Discovery Set yet, but from the box, it
> > looks like it comes with 2 clutch gears. The RIS really should have come
> > with clutch gears.
> >
> > --
> > Frank Filz
>
> I have not seen what this clutch gear can do. Does anyone care to describe
> what makes it great to have? It has 24 teeth just like other gears, but what
> does the "clutch" part mean (apart from what a clutch means like in a car).
>
> Also, how are you (general) using a clutch gear in your building?
The clutch gear is the same basic size as a normal 24-tooth gear, but the
center (where the axle passes through) can spin freely if there is too much
force holding the gear in place. I believe the gear says right on it that it
will stall against a force of 2 Newton-meters. So if your motor is running up
"against a brick wall", the motor can keep turning, but the gear train will
just stall.
Simply put, you use the clutch gear like any normal 24-tooth gear, but in
situations where your model might tear itself apart if the motor turns too far.
One application of this is for initializing a robot arm. When the RCX program
first starts running it doesn't know the actual position of the arm. If the
arm has a stop at one end of its motion and a clutch gear in its drive train,
you can simply run the motor toward the stop for "long enough" time that you
are guaranteed to reach the end of the robot arm's travel. When the arm hits
the stop, the clutch gear protects the mechanism from ripping itself apart.
After this calibration process, you know the absolute position of the arm, and
you can use delay timing or read a rotation sensor to move the arm to other
positions.
I hope this helps!
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Message has 2 Replies:
 | | Re: Does anyone have the 8479 bar code truck?
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| (...) I'm using them in lieu of touch-sensor feelers/bumpers on my robots. I have the motor attached via the slip-clutch, and a rotation sensor attached to the axle. When the sensor stops changing, the robot knows it's stuck somehow. (25 years ago, 1-Oct-99, to lugnet.build)
| | | Re: Does anyone have the 8479 bar code truck?
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| (...) I had been meaning to correct the faulty information in my earlier post ever since I got back home and actually looked at the gear. The actual rating printed on the gear says "2.5 o 5.0 Ncm", which I assume means that it will stall somewhere (...) (25 years ago, 10-Oct-99, to lugnet.build)
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Message is in Reply To:
| | Re: Does anyone have the 8479 bar code truck?
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| (...) I have not seen what this clutch gear can do. Does anyone care to describe what makes it great to have? It has 24 teeth just like other gears, but what does the "clutch" part mean (apart from what a clutch means like in a car). Also, how are (...) (25 years ago, 29-Sep-99, to lugnet.build)
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