pic: Possibly Useful Contraption

[Andy Baker]

Originally Posted by Richard

(as said in the picture description)

Added a Globe with sched 25 sprockets and chain. Hope to get some test results soon. Expecting quite a bit of torque, maybe 500 lbf-in at 2 rev/min with about 2 Ampere current draw. Should make a nice elbow joint or winch drive.

This is a simple and elegant application.

At this ratio, a 90 degree arm movement would take about 8 seconds. If the torque was cut in half and the speed doubled, then a 90 degree motion would take 4 seconds. This faster speed is probably more in comparable with arm movements during recent FIRST games (04, 05).

If I recall correctly, the 2005 TechnoKat robot's arm (along with many of the winning teams) had about 120 degrees of movement in under 2 seconds.

Andy B.