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Unread 11-04-2014, 19:06
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lcoreyl lcoreyl is offline
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Re: Swerve Drive vs Mecanum Wheel drive?

Quote:
Originally Posted by fox46 View Post
I don't follow you...
You mention the fact that you have easily plowed through holonomic drivetrains as the proof that ALL holonomic drivetrains will be easy to plow through. I’m sure you have plowed through another bot with tank drive too, so why doesn’t it follow that ALL tank drivetrains will be easy to plow through?
My point is you are overstating your point to the degree of being misinformation. tank is better at pushing than mec or swerve, but let’s not make someone who is looking to get information think that any team with a thrown together tank will be able to easily push around any holonomic drive.


Quote:
Originally Posted by fox46 View Post
How many blue banners have been won with skidsteer and how many with Omni/mechanum?
I was not arguing which is better. I was making the point that I think it is bad advice to say:
Quote:
Originally Posted by fox46 View Post
don't even bother with Omni if you aren't using a gyro and accelerometer to take some of the work away from the driver
and was providing evidence to support my claim that you gave bad advice. I myself would advise to try mecanum, and also try to get sensor feedback to make it better, but that’s different advice.

Quote:
Originally Posted by fox46 View Post
Tipping to two wheels is inherent in every design! This is what allows for the wonders of wheelies! This includes cars during acceleration, ATVs, bobcats- most any wheeled or tracked vehicle exerting a force above the level of the surface it is driving on transfers weight to the rear. I would think this is common knowledge.
I am not disregarding weight transfer, I am trying to make you see the difference between your 2 statements:

1:
Quote:
Originally Posted by fox46 View Post
If you have four motors, one driving each wheel of a swerve drive, as you reduce the normal force on your front two wheels during a pushing contest, then YES you are reducing the tractive power of your machine as the front wheels and hence two of your drive motors lose their effectiveness.
2:
Quote:
Originally Posted by fox46 View Post
in a shoving match, typically you are only using half your available drive power
I have no problem with statement 1. If you had originally stated it this way you would have been the first to mention that in this thread and it would have been helpful, and we could have talked about torque limited vs traction limited
statement 2 means that 2 wheels are off the ground. You are saying a typical pushing match ends up with 2 swerve wheels off the ground, and I find that to be misleading

Last edited by lcoreyl : 11-04-2014 at 19:10. Reason: forgot a quote
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