2012 drivetrain

[Travis Hoffman]

48/3193 ran with a 6WD with 8" AndyMark pneumatics (work flawlessly - great product - now offer a 6" version!), no center drop, angled frame with riveted delrin skids.

We easily cross the barrier and possess good maneuverability in both high and low gear. The lack of a center drop permits more stable shooting with no rock.

[Boe]

Originally Posted by Travis Hoffman

48/3193 ran with a 6WD with 8" AndyMark pneumatics (work flawlessly - great product - now offer a 6" version!), no center drop, angled frame with riveted delrin skids.

We easily cross the barrier and possess good maneuverability in both high and low gear. The lack of a center drop permits more stable shooting with no rock.

Did you guys have any problems turning without a dropped center?

Originally Posted by Boe

Did you guys have any problems turning without a dropped center?

They most likely de-inflated the front/back pairs of tires a bit so they turn easier, and can get over the bump easier.

[Travis Hoffman]

Originally Posted by Boe

Did you guys have any problems turning without a dropped center?

No. Our driver had no issues slinging the bot around. The distance between our front and back tire contact points is 24". Distance between contact points left/right is about 25". We used a West Coast style setup, so that helped us widen the wheel gap.

We also did very slightly lower the pressure of the front and rear tires relative to the center, which we kept near max pressure. There is no noticeable rock on the robot at all.

Here is a link to a pic of the underside of 48's robot:

https://docs.google.com/open?id=0B5w...3RiTkV6SmlyVXc

[MichaelBick]

6wd long, with supershifters, and a wedge integrated into the frame. If we were going to do it again, I would have gone with 8wd, smaller wheels, and drop down wheels, just so we could get over the barrier slightly quicker. It still wouldn't have made much of a difference, a couple of seconds per match at most.

[Wetzel]

We ran 4 8" plaction wheels with toughboxes. For another game where we drive into a steel bar like the bump we might look at different wheels, though two regional events and the championship with just one broken wheel the way we abused them isn't that bad.

We are planning to build a prototype geared drivetrain this fall, much like 25s, because the chain is what gave us the most trouble.

Wetzel

[Grim Tuesday]

Wide brecoflex tank treads.

[cgmv123]

Wide base, 6-wheel tank. AM roughtop plaction center, omni-wheel corners, back 4 wheels powered. CimPLE boxes, 2 CIMs per side.

[Jefferson]

Swerve baby swerve.

Originally Posted by cgmv123

Wide base, 6-wheel tank. AM roughtop plaction center, omni-wheel corners, back 4 wheels powered. CimPLE boxes, 2 CIMs per side.

Just curious - Why not power all 6 wheels?

[Billfred]

2815 used a kitbot-derived 6WD--kit wheels and all. Our frame was a hair low for the bump, but I think that was okay in the end due to our CG. If I were doing it again, I'd be more conscious of figuring out the bump.

[Shelbers2486]

We used a 4 wheel mecanum drive train, which was perfect with our 4 sided pick-up system. We could get over the bumb easily with skid plates, we could balance just fine, but I really wish we would have made a wide bot.

[372 lives on]

Tank treads.

even though no one on the team had done it before they worked very well even though it took more time then i wanted to spend on the drive train to get them working( week 3 and still didn't have it completed) and took time away from testing our shooter.

I would defiantly use them again. even with only two CIMs we couldn't be pushed around. even on the bridge the traction kept the robot from sliding down.

[kellymc]

We used a 6wd WCD drivetrain, however, the center wheels were mounted on pneumatic cylinders so we could retract them to go over the bump. Overall, it didn't work that well since the middle wheels were not powered.

you never learn anything without trying.

Kelly

[Taylor Nicholson]

Originally Posted by Gray Adams

I spent about 5 full minutes looking at their robot, and I now realize I didn't ask about the drivetrain. How did I not do that?!

I can't tell if they have something to lifts their robot or if their sheetmetal frame is just shaped to pop them up and over. 971 and 254 have a little drop down wheel that launches them over, but I can't remember what 1114 does. Something passive would definitely be nicer.

Our method is passive. We just angled the front and back edges of drivetrain, and riveted on strips of Teflon along the entire base to slide over the the barrier. This has allowed us to drive full speed into the barrier and get over. On 1114, we like the Dukes of Hazzard method of getting over obstacles.

The drivetrain is a 6WD using the AndyMark 8" pneumatic wheels (long configuration).