Quote:
Originally Posted by Siri
T
Steve: Good point; motors and frictional coefficients rule the game here. But correct me if I'm wrong, even if 6wd and mecanum tie the motor battle (i.e. a 2 motor 6wd), mecanum still loses on the coefficient front.
- AM Mecanum Wheel values (static forward/reverse, sideways): 0.6 and 0.5 (6"), 0.7 and 0.6 (8"), 0.54 and 0.41 (10").
- AM Traction Belt values: 1.2 (wedgetop), 1.3 (roughtop)
Even dropping the 6wd center, you're still looking at double or more the mu's.
Purely anecdotal: I've never seen a mecanum win a pushing war against a reasonable tank drive, 6 wheel or otherwise. In fact, in 4 years behind the alliance station glass, I can't think of (m)any that tied either.
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I was mostly on the theoretical plane. Still, not everyone uses the Andy Marks wheels. It IS possible to make your own Urethane Mechanums and come closer to the traction belt co-efficients. For that matter, replace the rollers on the AM mechanums with a urethane roller... but I'm too lazy. Even so, the mechanums are usually not intended for a pushing battle. I think it was mentioned earlier that the ability to escape and maneuver are more in line with the mechanum strategy. Wheels have been around since Roman times, Mechanums are relatively recent. I have a plan for a different mechanum but I think I'll skip on re-inventing the wheel. I just need an escape plan from the people who will tell me I'm crazy for building it.... I also have a plan for locking the wheels on a mechanum but have never bothered to build it. No one can have their cake and eat it too.
Such is life and then you die.
Steve