wall-e arm movement

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wall-e arm movement doc 07-10-2008
Posted by on July 10, 2008, 8:33 pm
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 Planning to build a Wall-e and thinking through some of the
mechanisms.

Haven't come up with a good way to get the arms, at the shoulder
points,
to move forward and down.

Pic: http://www3.sympatico.ca/doc/wall-eside.jpg

That dark band you see from top left to bottom right is supposed
to be the exterior track. In the pic it continues towards the bottom
left
to get a U shape but I'd be happy enough to handle just the L.

Thought about variations with racks/pinions and such but my best idea
so far would
be something like a side mounted gantry inside the box. And prolly
need one for
each side.

Somehow this seems like overkill.

Any other ideas?

Tanks,
DOC


Have robots. Will travel.
www.robot-one.com

Posted by Winston on July 10, 2008, 11:42 pm
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 doc@sympatico.ca wrote:

> Planning to build a Wall-e and thinking through some of the
> mechanisms.

Simple, Powerful, Tested!

http://www.global-b2b-network.com/direct/dbimage/50264981/Skid_Steer_Loader.jpg

--Winston

Posted by on July 11, 2008, 4:10 am
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Wall-e by any other name. :-)

In this case they call it an HT-50. And the right color scheme to
boot.

But the shoulder pivot points are fixed. And for that
matter it's the same for the animatronic mock ups that I have seen.
Just
sometimes the arms come out of the body at different points.

Seems like a challenging idea to be able to vary this dynamically.

Tanks,
DOC


> d...@sympatico.ca wrote:
> > Planning to build a Wall-e and thinking through some of the
> > mechanisms.
>
> Simple, Powerful, Tested!
>
> http://www.global-b2b-network.com/direct/dbimage/50264981/Skid_Steer_...
>
> --Winston


Posted by Winston on July 11, 2008, 12:16 pm
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doc@sympatico.ca wrote:

> Wall-e by any other name. :-)
>
> In this case they call it an HT-50. And the right color scheme to
> boot.

All the hard stuff is done. Just rip out the manual controls
and substitute servo hydraulic valves. What more could one want?
:)

> But the shoulder pivot points are fixed. And for that
> matter it's the same for the animatronic mock ups that I have seen.
> Just
> sometimes the arms come out of the body at different points.
>
> Seems like a challenging idea to be able to vary this dynamically.

Yup! I ain't no physics maven but it strikes me that shoulder joint
is the pathway for *a lot* of force. So it's best kept rigidly pinned
to the chassis.

--Winston

Posted by Larry Jaques on July 11, 2008, 8:22 am
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On Fri, 11 Jul 2008 03:42:03 GMT, with neither quill nor qualm,

>doc@sympatico.ca wrote:
>
>> Planning to build a Wall-e and thinking through some of the
>> mechanisms.
>
>Simple, Powerful, Tested!
>
>http://www.global-b2b-network.com/direct/dbimage/50264981/Skid_Steer_Loader.jpg

Yeah, that's even better than a base D-9.

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