DiscoBots Omni Drive over Bump

[ke7qcl]

Originally Posted by GaryVoshol

Have you considered adding the bumpers to the bot yet? If those are 8" omnis, it looks to me as if the frame member is 12 or 13 inches off the ground. The bottom of your bumper will be no more than 11". Bottoming out?

And a more general question which should be of interest for all teams - what will keep a ball from rolling more than 3" under the frame in this kind of setup?

If they are 8" omnis and the bumpers extend down about an inch it would still leave you with about 4" at the lowest point while crossing the bump, but you still would want to add a type of guard to prevent the ball from rolling under the robot. Some ideas might be either a chain that will flex when you go over the bump or a piece of pvc pipe.

[lynca]

Originally Posted by Andrew Schuetze

I too am interested in where, what type, and why they intend to add more wheels are posted by Andrew L.

We plan to add more omni wheels to the front and back to achieve strafing.

We also have lots of testing/cacluations to do with bumpers and speed ratios.

Thanks for all the helpful ideas. We will keep posting videos & updates on twitter. Stay tuned ... http://twitter.com/discobots

[Andrew Schuetze]

Originally Posted by lynca

We plan to add more omni wheels to the front and back to achieve strafing.

We also have lots of testing/cacluations to do with bumpers and speed ratios.

Thanks for all the helpful ideas. We will keep posting videos & updates on twitter. Stay tuned ... http://twitter.com/discobots

Interesting... in 2006 the Toltechs, 499, used just four omni wheels at 45 deg. in the corners to obtain the control you are talking about but we were not able to climb the diamond plate ramp with that set-up. So if I understand your post, you intend to set up a second drive train to give you lateral or side-to-side motion.

I am certian that you are working on dealing with the impacts that the front omni wheel will encounter when hitting the ramp at speed.

[ke7qcl]

you can either do that or instead use mechenam wheels which would be generally the same thing. i think that it would allow you to do the same but i think it would be easier to assemble because they need to be parallel and it would be easier to get over the bump than with 4 omnis at 45 degrees.

[Andrew Schuetze]

Originally Posted by ke7qcl

you can either do that or instead use mechenam wheels which would be generally the same thing. i think that it would allow you to do the same but i think it would be easier to assemble because they need to be parallel and it would be easier to get over the bump than with 4 omnis at 45 degrees.

Omnis at a 45 could not climb the diamond plate ramp in 2005. In fact, the plastic versions that where new from AndyMark.biz in 2006 shattered if we hit the ramp too hard. Mechanum wheels where not available from IFI until 2007.

APS

[KGood]

Just wondering, on Week 1 Pneumatics Test video where you showed the piston, what PSI were you using?

[lynca]

Originally Posted by KGood

Just wondering, on Week 1 Pneumatics Test video where you showed the piston, what PSI were you using?

Our pneumatics test was at 60 PSI

We will try to post more videos of week 2 soon, stay tuned to our new website,
http://2010.discobots.org/node/16

[lynca]

Originally Posted by Andrew Schuetze

I am certian that you are working on dealing with the impacts that the front omni wheel will encounter when hitting the ramp at speed.

Thanks for the warning. We have been testing omni wheel high speed impact without any failures yet, but we have our backup wheels ready just in case!

[falconmaster]

Originally Posted by lynca

Thanks for the warning. We have been testing omni wheel high speed impact without any failures yet, but we have our backup wheels ready just in case!

video is not working.......

[DynamiteHack]

You guys've already built a robot?? We haven't finished brainstorming!

OT: The more I think about it, the more it seems like using omni wheels in a simple skid-steer config would help this year; can you guys confirm that it skids/sticks less when turning?

[waialua359]

To add light on some of the points made in this thread.
Our team has already tested a holonomic omni wheel setup.
As far as going over the bump, the problem we encountered was the transmissions/CIMS bottoming out at the top of the bump.
Raising it or using stilts such as the KOP AM ones raises the COG considerably and that's the route we didn't want to take.

We did additional testing on the 6 wheel setup that you folks proposed and the driver's loved the way they were able to maneuver around the field.
However, using the FP is a bad idea for the drive and we decided to scrap the idea and go now to plan B.
Plan B meaning moving away from omnis and drivetrain setup.

[lynca]

Originally Posted by falconmaster

video is not working.......

The videos are just links to youtube & vimeo. The website videos are a bit flaky sometimes. But the kids are working on improving the integrated video section (we usually don't go over 1000 hits) !

http://www.youtube.com/user/lamardiscobots

http://vimeo.com/user1102634/videos/sort:date