Subject:
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Re: challenge: LEGO copier
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 5 Aug 2004 00:16:43 GMT
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Viewed:
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1087 times
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In article <20040804230722.4CC6C2DFC6@cashew.wolfskeep.com>,
lego-robotics@crynwr.com (T. Alexander Popiel) wrote:
> OK, just to clarify: assume an X-Y-Z space with studs sticking up in
> the Z direction. You mean a model that's only one stud thick in X,
> arbitrarily wide in Y, and arbitrarily high in Z?
Yes, but not arbitrarily -- there would be some limit in width (Y) and
height (Z), in order for the model to fit into the machine.
> Yes, that would be a much simpler problem than what I was envisioning,
> which was X and Y sizes arbitrary, with two interlocking layers in Z
> (where the interlocking of pieces extending in either X or Y would
> provide the structural integrity of the model).
Yes, that's a much harder problem, which is why I was thinking to limit
it to a thickness of one in X.
> For what I think you're suggesting, though, it actually would be
> fairly simple: have a flat feeder bed that you lay the model down in.
> This is gripped by large wheels and rolled (in the model's Z direction)
> to a disassembly arm...
I still don't see that disassembly of the original is either necessary
or desirable. Use a camera to analyze the original, and don't worry
about variations in which bricks are chosen, as long as the overall
shape and color pattern come out the same.
> Then, on the other side of the parts bins, you have a gripper which can
> extract from the bin, traverse to the appropriate point, then attach to
> the model being built. This should require another 5 degrees of freedom
> (grab, pull, flip, traverse, and model feed), plush kinesthetic inputs.
That parts trickier than you make it sound, I think. You may have a
part in the third row (up in Y) which is not connected to anything in
rows 1 or 2; it's only connected to the model via bricks in row 4, which
you haven't done yet.
So, the robot couldn't just build the model bottom-up; it would have to
work its way up and down to continuously maintain connectedness of the
pieces.
Best,
- Joe
,------------------------------------------------------------------.
| Joseph J. Strout Check out the Mac Web Directory: |
| joe@strout.net http://www.macwebdir.com |
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Message has 1 Reply:
 | | Re: challenge: LEGO copier
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| (...) Ah, hmm, I was expecting it to be a continuous fabric, not a holey one. That would make it harder, and in fact makes it even more important to not confuse neighboring pieces of the same color (otherwise you could lose structural integrity by (...) (20 years ago, 5-Aug-04, to lugnet.robotics)
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Message is in Reply To:
| | Re: challenge: LEGO copier
|
| (...) OK, just to clarify: assume an X-Y-Z space with studs sticking up in the Z direction. You mean a model that's only one stud thick in X, arbitrarily wide in Y, and arbitrarily high in Z? Yes, that would be a much simpler problem than what I was (...) (20 years ago, 4-Aug-04, to lugnet.robotics)
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