What drivetrain style are you using?

[BigWhiteYeti]

Just curious, has anyone had any experience with the holonomic style drive? (four omnis pointed at 45 degree angles to the robot sides) We were considering using it but ended up with standard tank and omnis in the back.

[Tapoore]

Offset center wheel drive (center wheels pushed 1.5" forward)

The front and rear wheels are just unpowered slip wheels. We have used this setup twice before and it's incredibly maneuverable.

[midway78224]

we plan to use the a 6wd with the supershifters

[Elgin Clock]

Walking isn't an option in the poll??
Hmmph...

Oh well... guess I will have to go with "Other" in that case.

[DarkFlame145]

we have 6 points of contact on the ground, the front and middle 2 are 2" IFI wheels and in the back we have ball casters. we should be able to turn really well in take mode.

[Aren_Hill]

a very similar but yet much improved version of what we had last year.... you get to do the research lol. i'm excited for the improvements

[SSMike]

6 wheels with tank steering. This should make it easier to push the balls around, if need be, and also simply drive around well.

[JesseK]

We wanted to do a differential on ours, but alas we're trying so many new things this year we wanted to have a solid backup plan of just "driving around". It would be terrible for all of our new achievements to fail just because we made a mistake in our differential design. For this year, we're sticking with something that reliably works for us, and that's tank drive -- but with 2 omnis (possibly 4 if my CoM calculations were off ).

There's always the offseason though.

[Enigma's puzzle]

mecanum we will se how much menuverability we will really get

[Nevets Amstier]

I agree with what others said about omni/caster wheels

omni and caster wheels are easy to push around. 6wd tank with AM 2 speeds for the win

[Madison]

6WD with omniwheels at the corners, as we've been doing for a few years now.

http://www.chiefdelphi.com/media/photos/29748

[sonicx059]

Last year for rack and roll we use 6 wheel drive but our front and rear wheels were omni wheels and our middle were the standard wheels we got. This year the team (14 people 10 of which whoom has never done anything like this before) voted on 4 wheel with two omni in the rear.

[reflion]

We were going to try rack-and-pinion car style steering, but we figured that since we were so behind schedule we'd go back to tank steering. At least we still have the maneuverability necessary to align with and pick up a trackball...

Just out of curiosity (it's my first year at FIRST), what are the benefits of six-wheel drive train over four-wheel? And what's omni-drive?

[EricH]

Originally Posted by reflion

Just out of curiosity (it's my first year at FIRST), what are the benefits of six-wheel drive train over four-wheel? And what's omni-drive?

Omni-drive is the ability to go any direction without turning. Two classes are swerve (turn the wheels) and holonomic (non-turning wheels with rollers on them).

6WD vs 4WD is a little harder. 6WD doesn't bounce as much as a 4WD while turning. However, the exact benefits depend on the type of 6WD--dropped center, coplanar, and coplanar (omni-in-the-corners) have their own quirks and disadvantages, but all have their advantages.

[Mike Hendricks]

We usually go with 6wd, but decided that there wouldn't be enough contact this year to justify the weight.

2wd using Dewalt gearboxes on CIMs - in the center with 6" dia 2" wide IFI traction wheels. Ball transfers on the corners Basically a VERY fast modified version of our 2004 drivetrain.