Newsgroups: comp.robotics
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From: mwd@cray.com (Mark Dalton)
Subject: Re: Robot legs
Message-ID: <1994Dec21.175240.154@walter.cray.com>
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References: <D14t8G.C8@cup.hp.com>
Date: 21 Dec 94 17:52:40 CST

Does anyone know of any good metal suppliers,  I am thinking of various
joints: knee/elbow, shoulder, etc.  Just use these in aluminum tubing
it is very strong and very light weight.  I am machinine the prototypes
write now (but I am not a very good machinist).

	Also what I really want is a ball-joint that is not straight.

For upright(biped)       For a spider walker
 Side  front            
      Shoulder            
  O     O                 Knee
  |     /                   /\   Shoulder
  |     |                  /  \  O
  |     |                 /    \/  <-------- This I found hard to make.
  /     | Knee           /
 /      |               /
/       |


If the leg has no joint, just a fixed axis, then it is much easier.
I want to use the biological models though.

Mark

Richard Man (mun@cup.hp.com) wrote:
: US&R wants $610 for the *body* of a six legged robot. Ouch!
: OK, I am interested in making robot legs:
: 	(8 spaces tab)
: 	(servo 1) ------|
: 		  			|
: 	(servo 2) ------|
: 		  			|
: 		  			|
: 		  			|

: 	This is the side view. Servo 1 moves the leg in and out of the page, and
: 	servo 2 moves the horizontal rod across the page. Thus boths horizontal
: 	legs need to be attached to the leg with some sorts of hinges.

: 	So the question is, what is the best materials for this? Plastic,
: 	Alum tubes? How do you make hinges w/ them?

