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Originally Posted by Ether
If by "power" you mean "maximum force" this is not correct. Even with the same material on the mec and the 6WD, the mec will have less maximum pushing force, as explained in many posts here on CD.
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By "omni holonomic" I was referring to the drive system of four omni wheels placed in square or diamond configuration. If that's not what the term means, then I'm sorry, that's what it's always referred to in our team.
No, I don't mean maximum force. I know mecanum wheels do start skidding before 6wd drive, but honestly I *rarely* see a pushing match actually reach that point in competition, and with the pinning rules in place it's even more of a nonissue now than it has been in previous years.
And yeah, the rollers turn while rotating, but it's not as if someone hitting you from the side will cause you to start spinning.
Quote:
Originally Posted by Chris is me
This is not true.
Also not entirely true - it's worth noting a mecanum drive more or less necessitates a lower traction roller.
It can also be pushed from the front more easily due to those spinning rollers.
Keep in mind just because there's no "at the goal" defense doesn't mean there is no defense.
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I've had to push against 4wd and 6wd drive robots with mecanum before, and not once have I seen the rollers spin - try it yourself, you'll notice that the difference is not nearly as big as most people make it out to be. Yes, there's a lower cap before mecanum wheels start skidding, but how often have you seen wheels skid in a FIRST pushing match? It's not exactly a common occurrence - in my time in FIRST I really can't recall ever seeing our mecanum wheels skidding on the carpet. In my experience, the idea that "mecanum drive gets pushed around a lot" is almost entirely a myth.
People put way too much store in "If we end up exactly head to head and are pushing each other, my robot will win out." That's not a realistic situation. In the context of an actual competition, in which your goal is not to push head to head with other robots, mecanum is not at a significant disadvantage in terms of being pushed. Take into account the fact that defense isn't allowed to push you while you're scoring, and the best way to get into the scoring zone will probably be dodging the defensive robot rather than pushing it (in fact, are you even allowed to push another alliance's robot into your scoring zone?), and I really don't see what the benefit of a 6wd is.