pic: Team 48's 2011 Robot - xtremachen14

[Travis Hoffman]

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[Travis Hoffman]

Fun video of our roller claw in action, taken on our practice bot today with a Flip cam mounted directly below the arm.

http://www.youtube.com/watch?v=YP_TYZvtYzU

Toughboxes are loud little suckers....

[Dan 1038]

Travis - great looking bot, as you will see in Pitt ours is quite similar... we used bane bots on the arm, window motors on the rollers and deployment and quad cims for the two speed drivetrain...and a cylinder to extend the arm. Looking forward to seeing you guys!

What is your starting configuration? I'm pretty sure the claw has to be inside the bumpers, and it looks like it sticks out a bit. Sticking it straight up should work.

[Travis Hoffman]

Originally Posted by ThaineP

What is your starting configuration? I'm pretty sure the claw has to be inside the bumpers, and it looks like it sticks out a bit. Sticking it straight up should work.

Nope - gotta fit under 60" to start.

The arm fits easily inside the robot's starting configuration. At the time of the picture's taking, the arm settled in that position, it's weight balanced by the upward force placed on it by the passive assist surgical tubing bands. We have been tweaking the tension in those bands to force them to stretch more to provide an equivalent buoyancy, meaning the arm will rest closer to the home position. At that point, any little "float" to the arm can be cancelled out by a little velcro holding it in place until the match starts, and power is applied.

[nnfuller]

What transmission is driving that arm? Is it a Banebot? Did you guys have any trouble with it? I love the linkage though, and a great integration of a passive system to lighten the load on the whole system.

[Travis Hoffman]

Originally Posted by nnfuller

What transmission is driving that arm? Is it a Banebot? Did you guys have any trouble with it? I love the linkage though, and a great integration of a passive system to lighten the load on the whole system.

48's competition robot arm is powered by a Banebots RS-550 motor mated to a Banebots 104:1 P60 planetary. We cap the max voltage to the arm at 40%-50%.

The arm design borrows from concepts used by 67 (2007 linkage) and promoted by 148 (passive surgical tubing resistance).

We have had zero trouble with P60's in any application since they came out in 2009.

[Akash Rastogi]

Just noticed the omni wheels in the front, is this not a drop center?

Congrats on the successful season, Travis.

[Travis Hoffman]

Originally Posted by Akash Rastogi

Just noticed the omni wheels in the front, is this not a drop center?

Congrats on the successful season, Travis.

Thanks, Stogi. It is not a drop center. From what I observed at competition, the omnis did not hamper us in holding our position, pushing through defense, etc.