Subject:
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Re: FetchBot, The Truck and patents
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 31 Dec 1998 18:22:18 GMT
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Original-From:
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Ben Williamson <benw@pobox.com&spamless&>
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Viewed:
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1588 times
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On Thu, 31 Dec 1998, Jakob Nebeker wrote:
> Hey, your 'bots RULE!! I especially liked the fetchbot, the way you
> move the arm up and down AND close the claw with only one motor. Would
> you mind giving a more detailed explanation of how that works?
I was afraid it wouldn't be terribly clear, thanks for saying so. I've
added four more images to the bottom of the page that might help. They
show the arm with most of the robot base removed, so you can see the gears
and cams more clearly.
Everything is driven by the big gear: when it rotates clockwise (with
respect to the new photos) the cams push the arm up while the grabber
opens wide. When it rotates counter-clockwise, the grabber closes until
it can't anymore. When the axle that moves the grabber can't rotate, the
arm becomes locked to the main axle (the one with the big gear) and the
whole arm lifts up. This puts a fair bit of strain on the small gears
where the arm axle and the main axle meet, which is why there is a lot of
reinforcing at the base of the arm. Otherwise the arm axle just pops out
of the arm!
I had to come up with the arm design when I only had two motors and I
wanted to move blocks around. It is possible to build a robot with this
arm and one axis of movement using only the parts in the MindStorms set.
I suspect from looking at the catalog photo that my efforts are way
outclassed by the barcode truck. Does anyone have this model?
- Ben.
-------------------------------------------------------------------
Ben Williamson benw@pobox.com http://www.pobox.com/~benw/
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Re: FetchBot, The Truck and patents
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| Hey, your 'bots RULE!! I especially liked the fetchbot, the way you move the arm up and down AND close the claw with only one motor. Would you mind giving a more detailed explanation of how that works? PV (...) ---...--- Purple Viking (Jakob (...) (26 years ago, 31-Dec-98, to lugnet.robotics)
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