Quote:
Originally Posted by KleinKid
Our arm design has the shoulder joint at a fixed location offset towards the back of the robot. In its starting configuration it should be about 55" long and after extension it should be 64" long. I am looking into using pneumatics for the extension but many members on my team want to use a threaded rod hooked up to one of the banebot motors.
Our material for our arm is 1" aluminum tubing with 1/8" thickness which is a little heavy duty for what were using it for but it's whats left over after we build the frame to support the arm.
Instead of mounting the large sprocket to an axle could we mount our two large sprockets directly on the arm by drilling holes through the sprockets and bolting it directly onto the aluminum tubing?
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We used 2 window motors with 2 60t sprockets in 2007. everything was on a shaft but the arm was bolted directly to the sprockets with little spacers between them so the chain did not run into the arm. It worked pretty well, but our programmers found it hard to get our arm hold to get to move to the targeted position because it was so massive and the window motors are either on or off, no fine position movement. In the end it worked pretty well though, using surgical tubing as a counter weight.
Heres some video of it in action:
http://www.youtube.com/watch?v=Ak954iBVwKg