Hanging Mechanisms

[X-Istence]

Originally Posted by Travis Hoffman

Pardon all the extra fluff (and Meat Loaf!), but the following video has footage of our Team 48 2004 robot in hanging action:

http://video.google.com/videoplay?do...27946966&hl=en#


P.S. I'm ollllllllllllld.

How far into the movie?

[Travis Hoffman]

Originally Posted by X-Istence

How far into the movie?

Around 2 minutes in. As a bonus, you get to see 118's telescoping winch lift, too.

[caincteam2777]

what did you use to raise and lower your arm?

[Travis Hoffman]

Originally Posted by caincteam2777

what did you use to raise and lower your arm?

It is a two-stage extension arm. The bottom frame of the first extending stage was attached to a loop of #25 chain run around a drive sprocket and an idler sprocket fixed to the base frame of the arm.

The chain was driven up and down by two Fisher-Price motor/Bosch drill gearbox combos mated into a single drive assembly at the bottom of the base frame of the arm. Reportedly, *math* indicated that this system could lift the weight of our robot plus at least one more....

The second extending stage (the one with the hook on it) was driven by a Globe motor (*sniff* RIP) and another #25 chain setup. Both stages operated independently, so the arm extended very quickly.

It should be obvious, but the first stage did the lifting once the second stage extended fully, and the arm tilt driven by the van door motor (*sniff* RIP) smacked the hook into place, preferably without first being driven in the wrong direction by our copilot, an aggravating trait we did not fully flog out of him until the 2004 Canadian Regional.

Magic was used to keep the robot hanging once we became 100% exasperated with the Bosch gearboxes' anti-backdrive pins.

[caincteam2777]

i ment what did you use to change your angle of the arm, great way of doing it btw

[Travis Hoffman]

Originally Posted by caincteam2777

i ment what did you use to change your angle of the arm, great way of doing it btw

That would be the "tilt" mechanism I mentioned, driven by the Van Door motor and (if I remember) 2 stages of sprocket reduction. If you watch the video near the end, you'll see us right ourselves with the tilt after getting into a sticky situation against some unusual-looking wedge-shaped robot. I wonder which team that was, again?

[caincteam2777]

lol, how did you mount the motors for the tilt?