21-02-2011 15:28

Madison

Re: pic: FRC488 - Team Xbot Presents

This is our (mostly) complete robot for 2011. The minibot deployment system remains at our lab undergoing design revisions.

The major features are:

-- Octocanum Drive that couples mecanum wheels with pneumatically lowered traction wheels for enhanced maneuverability without sacrificing pushing power.

-- Field-oriented drive while on mecanum wheels, tank drive while on traction wheels. Seamless transition between them.

-- Neutrally bouyant four-bar linkage coupled to a RS550 motor at 570:1.

-- "Whisker" tube manipulator releases tubes onto pegs from above, eliminating interference while scoring. It can load easily from human player or from the floor.

-- Three non-powered omniwheels with encoders.

-- LED-based human player signaling system

-- Camera assisted scoring

Video:

Basic autonomous mode test -- http://www.youtube.com/watch?v=eoHDdyRu0Zk

Driver hopeful test -- http://www.youtube.com/watch?v=_5y2p_GcSnw

21-02-2011 19:48

nighterfighter

Re: pic: FRC488 - Team Xbot Presents

I hope that isn't your competition robot... you're missing bumpers!

Is your autonomous using line followers, encoders, gyro/accelerometer, or camera tracking? Or all 5?
Also, does it work on the middle line?

21-02-2011 19:55

MrForbes

Re: pic: FRC488 - Team Xbot Presents

Nice! very spiffy frame construction technique!

21-02-2011 20:57

Kris Verdeyen

Re: pic: FRC488 - Team Xbot Presents

Love the end effector. Looks like magic.

For mouse-style tracking of position, I assume? How do you handle the raised areas on the floor?

21-02-2011 21:56

bam-bam

Re: pic: FRC488 - Team Xbot Presents

Cool robot! Looks great and drives good!

One thing quickly: In the auto basic drive, it says in the description that you guys will be planning to do the action twice during autonomous. I'm not sure what you mean here.

21-02-2011 22:10

MattC9

Re: pic: FRC488 - Team Xbot Presents

Great robot! look almost exactly like ours!! is there any way your gripper can pickup from the ground?

22-02-2011 02:39

Madison

Re: pic: FRC488 - Team Xbot Presents

It uses seven encoders and a gyro. It does not use the lines at all. We've got camera tracking code in place that would allow the robot to align itself using the retroreflective tape, but that wasn't in place when the video was filmed and isn't necessary.

Thanks -- when you've got a hammer, everything looks like a nail. When you've got a laser cutter, everything looks like sheets of polycarbonate or delrin.

Yeah, we've got two wheels aligned forward/backward and one sideways. They're each mounted a spring-loaded suspension arm and should handle the bumps in the carpet with little trouble. Since our octocanum drive raises the frame by about .5" when we're on traction wheels, we needed to spring-load the follow wheels to maintain constant contact with the carpet.

We'd like to score two ubertubes in autonomous mode.

It sure can. The whisker and the arm it's attached to are actuated downward by a pneumatic piston. That puts the gripper just in front of the bumper and we load from there. You can see it floor-load here: http://www.youtube.com/watch?v=dn2apqadb7M

26-02-2011 23:45

Darren Collins

Re: pic: FRC488 - Team Xbot Presents

Elegant and effective 488. I'm eager to see your bot in person.