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View Poll Results: Mecanum or 6WD
Mecanum 90 40.36%
6WD 133 59.64%
Voters: 223. You may not vote on this poll

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Unread 12-01-2011, 22:09
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Re: Mecanum or 6WD

To get across the field.
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Unread 24-01-2011, 13:09
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Re: Mecanum or 6WD

this isn't a very defensive game, so i don't think you need to worry about traction and pushing power. no other robot will play heavy defense.
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Unread 24-01-2011, 18:13
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Re: Mecanum or 6WD

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Originally Posted by karomata View Post
this isn't a very defensive game, so i don't think you need to worry about traction and pushing power. no other robot will play heavy defense.
That sir is where you are wrong, this game is a very defensive game. The robot that cannot pick up a tube, either by design or failure of strategy and prototyping, or breaking is not going to spend 2 minutes letting you put tubes on the rack. There will be defense. Every robot on that field can drive faster than you can strafe (presumably unless I am missing a strategy to move slow and relentlessly), and I expect to see a 6wd will be able to bulldoze (of course not at ramming speed) through a robot that is trying to block their path, especially if the robot isn't on tractioned wheels.

As long as the robots are allowed to contact each other, traction will be important.

Its not that hard to find a way to slow down another robot, and pinning is not the only way to slow down or stop another robot from scoring. ask all the robots that sat in front of a goal last year, or all the robots that are going to turn sideways and mirror your attempts to pass them. I think I would be able to teach my alliance partners to play pestering defense in under 30 seconds.
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Unread 09-01-2011, 18:41
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Re: Mecanum or 6WD

It's a pretty board statement, but from my experience I'd have to say 6WD because a macanum bot will get pushed around easily.
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Unread 09-01-2011, 18:50
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Re: Mecanum or 6WD

I'm going to disagree with teams that go "mecanum = agility". Every year I see so many teams who say "oh we should be agile so we need a mecanum drive" and it drives me nuts.

First, agile is a very vague term. Mecanum has a specific kind of motion it can do that 6wd can't. The real question is do you need that kind of motion?

Second, it is very easy to underrate the "agility" of a 6wd system. It can turn easily on a dime and drive very well in that fashion. The only thing it can't do is strafe.

Essentially, the trade off is strafing sideways or resistance to pushing / pushing power. Which is more important?
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Unread 09-01-2011, 19:33
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Re: Mecanum or 6WD

Quote:
Originally Posted by Chris is me View Post
I'm going to disagree with teams that go "mecanum = agility". Every year I see so many teams who say "oh we should be agile so we need a mecanum drive" and it drives me nuts.

First, agile is a very vague term. Mecanum has a specific kind of motion it can do that 6wd can't. The real question is do you need that kind of motion?

Second, it is very easy to underrate the "agility" of a 6wd system. It can turn easily on a dime and drive very well in that fashion. The only thing it can't do is strafe.

Essentially, the trade off is strafing sideways or resistance to pushing / pushing power. Which is more important?
I see the same exact thing! It makes me confused. I would not consider mecanum more maneuverable also. The only trade-off is pushing power to strafing.

Well stated.
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Unread 18-01-2011, 05:36
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Re: Mecanum or 6WD

We are going to test both. We have a team working on each type. We have found our past mecanum systems to be plenty fast. I also think that they are advantageous this year with the narrow feeder chute. It might be easier to make lateral corrections to our position with the crabbing ability. Rather than having to back up and turn, we can make small moves sideways if our tubes are a bit off.

As for dealing with defenders, our drivers have been able to use crabbing to outmaneuver less agile robots. We are sometimes a bit slower in a straightaway than 6 wheeled robots, but haven't been significantly disadvantaged by that.

We are interested in whether the rocking motion of the CA drive will make use vulnerable to tipping when extended. Jury is still out, of course.
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