Re: need advice from lego gurus

In lugnet.robotics, dan miller <[email protected]> wrote:
> I'm thinking about the next version of my one-armed robot, Grabot.
> Presently he looks like this:
>
> http://www.danbmil.com/lego/DSCN6131.JPG
>
> what I want to do is have the claw go up and down but stay parallel to the
> floor, rather than hoist itself up as in this picture.  Does anyone know of
> a technique, used or just conceptual, for doing this?  I'll need some sort
> of elevator construction, that can hold quite a bit of weight for the arm
> assembly.  Here's a top-level view that shows how the arm looks now:
>
> http://www.danbmil.com/lego/DSCN6128.JPG
>
> Any thoughts will be greatly appreciated.  I am thinking of some sort of
> worm gear + one of those toothed strips, but I can't really see how to make
> it work efficiently with a good range of motion.
>
> thanks in advance, this is a great group
>
> - dan

There are probably several ways to solve this.
One is using parallelogram as arms that lifts, and mounting the gripper in one
end of the parallelogram and the robot in the other. I have no photos or drawing
what I think of. But if you make an paralellogram of beams and make it so you
can skew it in one direction, then you understand what I mean.

Another way is this:
http://www.peeron.com/scans/8094-1/30


Regards
Øyvind Steinnes