Subject:
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Gripper and lift arm with single motor
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 9 Aug 1999 18:28:15 GMT
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Viewed:
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891 times
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I hope someone can help me with this
I tried most of the weekend to try and build a mechanism to grab an item
(49.6x28 VR wheel) and lift it using one new type motor (the ones in the
RIS). All my attempts seem to either self destruct or just didn't work.
Basically my designs were based upon fixing an axle at the lift pivot point
and using a pair of bevel gears to produce rotation to drive a gripper.
What I would like to be able to do is drive the jaw once it is closed the
lift mechanism would engage. I just couldn't get it right and its getting
me a bit frustrated.
NO I can't just use another motor and some touch sensors, I need the motors
for drive adder/subtractor based tracked vehicle and the sensor inputs for
navigation and object detection
Anybody give me any pointers to designs on the web which actually work - I
know Ben Willamson had a design but that doesn't give enough movement of
the gripper jaws for my project
TIA
David Walton
Email: d.walton@ndirect.co.uk
Take a look at my homepage (still under construction though)
http://www.walton.ndirect.co.uk/
Now on ICQ: 44277445
"If it ain't broke don't fix it !!"
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Message has 4 Replies:
 | | Re: Gripper and lift arm with single motor
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| Hello, Ok, I haven't actually done this but I have given it some thought. First, imagine that you just want to lift the arm. A classic way would be to put a gear into the pivot point that was fixed to the arm. Another gear in the platform could turn (...) (25 years ago, 9-Aug-99, to lugnet.robotics)
| | | Re: Gripper and lift arm with single motor
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| Hi David, Are you sure Ben's grabber won't work for you? Using a smaller and lighter grabber based on his original design, I can pick up one of those wheels. What exactly doesn't work? Here's my design (Minerva): (...) -- Did you check the web site (...) (25 years ago, 9-Aug-99, to lugnet.robotics)
| | | Re: Gripper and lift arm with single motor
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| (...) Lego has included several such designs in their sets. Unfortunately none of the instruction scans are available on the Internet, mostly because these sets are quite recent. Among these sets, 8250 search sub is now on sale at $25 on Lego S@H. (...) (25 years ago, 9-Aug-99, to lugnet.robotics)
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