2791 Shaker Robotics 2013 Reveal Video

[Chris is me]

We're really proud of this one. Pictures coming to CD-Media shortly. While you're waiting, here's our build album.



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Shaker Robotics, Team 2791, is proud to present our 2013 robot, DJ Bison.

Drivetrain: 4 CIM single speed 4WD geared for ~11.3 feet per second. Back wheel is a 6" direct driven Colson, front wheel is a 2012 kit wheel (6").

Arm: Multifunctional arm serves as frisbee hopper, shooter, aiming system, and hanging mechanism all in one.

Hanging: Hooks on side of arm. Shoulder joint powered by a CIM geared ~900:1 through two custom gearboxes. ~2 second lift time. Due to inefficiencies in the gear train and strategic CG placement, gearbox does not backdrive from hanging position.

Hopper: Two-tiered system. Top layer holds three frisbees. Vex wheel and motor spin to drop a frisbee down to the bottom layer, staging it in the shooter.

Shooter: A 6" pneumatic piston pulls each frisbee into a two wheeled shooter. CIM and Mini-CIM each direct drive a pair of 4 7/8" Banebots wheels. Can comfortably make shots from most places past half court.

Aiming System: Aiming is done entirely with the arm. A camera feeds back to our driver station, which has a crosshair drawn on a piece of Scotch tape attached to the screen. An encoder and limit switch allow for autonomous positioning of the arm and a pre-set height for travelling under the pyramid and using the loader.

Weight: ~90 Lbs

We are extremely proud of this robot. We think this is our best robot yet. We've finally achieved that elegant simplicity we've always wanted.

[Nick Lawrence]

Hey look, 100% less dubstep in that arm.

Congrats buddy, looks fantastic. Looking forward to the EWCP brawl at BAE!

-Nick

[Meredith Novak]

Very slick robot. Enjoyed the video.

Awesome job Chris and 2791! This bot is amazing. Can't wait to see it in action!

[Nathan Streeter]

Great job - looks like it'll be an effective robot in Ultimate Ascent... Hopefully I'll be able to swing by and check it out on Thursday. :-)

We look forward to playing with you at Granite State next weekend!

[Chris is me]

Thanks for the kind words everyone.

Originally Posted by Nick Lawrence

Hey look, 100% less dubstep in that arm.

Congrats buddy, looks fantastic. Looking forward to the EWCP brawl at BAE!

-Nick

Yup, the arm has zero dubstep this year. That was a day 1 design requirement. No PVC or wood anywhere on this robot.

BAE is going to be sick. Between 610, our "triplets" 229 and 4124, 1519, 3467, us... it's going to be an unusually offensively oriented regional.

Originally Posted by Nathan Streeter

Great job - looks like it'll be an effective robot in Ultimate Ascent... Hopefully I'll be able to swing by and check it out on Thursday. :-)

We look forward to playing with you at Granite State next weekend!

Thanks! We certainly did okay last time we paired up at BAE! We promise we won't die going up the bridge during Finals 2 this year.

[Nathan Streeter]

Originally Posted by Chris is me

BAE is going to be sick. Between 610, our "triplets" 229 and 4124, 1519, 3467, us... it's going to be an unusually offensively oriented regional.

Especially when you consider the "usual" crew of 58, 78, 95, 126, 175, 319, 1058, 1073, 1153, and 1922 will all be attending... GSR always seems to have a very deep field (even if we do lack the "elite" level of the field), and this year seems to have even more depth! Should be great!

Originally Posted by Chris is me

Thanks! We certainly did okay last time we paired up at BAE! We promise we won't die going up the bridge during Finals 2 this year.

Hah - no hard feelings! We certainly have no regrets... other than having failed to harvest effectively at GSR! :-)

[Akash Rastogi]

Chris and team, extremely slick bot this year. I wish you the best of luck!

[nathannfm]

After a day of matches how often are you finding you have to replace those orange shooter wheels due to wear?

[Chris is me]

Originally Posted by nathannfm

After a day of matches how often are you finding you have to replace those orange shooter wheels due to wear?

We change them about once every 3-4 matches. We break in wheels with about 20 shots before going on field with them.

[sdcantrell56]

Originally Posted by Chris is me

We change them about once every 3-4 matches. We break in wheels with about 20 shots before going on field with them.

Put some speed control on them and they will last much longer