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-   -   On mecanum wheels (http://www.chiefdelphi.com/forums/showthread.php?t=83979)

Patrick Chiang 07-03-2010 19:39

On mecanum wheels
 
Would purchased mecanum wheels work as well if placed in a rectangle instead of a square like they're supposed to?

Stephen of REX 07-03-2010 19:40

Re: On mecanum wheels
 
I've never heard of them having to be in a square. A rectangle should be fine!

alicen 07-03-2010 19:42

Re: On mecanum wheels
 
omnis are the ones generally put in a square pattern

mechanums work perfectly fine in a rectangle :)

Patrick Chiang 07-03-2010 19:43

Re: On mecanum wheels
 
I don't know. I'm assuming that the rollers have to point to the center of the robot, and if they're oriented at a 45 degree angle, so they would have to be in a square. But we've never tried, so we don't know for sure. None of the reports we've read seemed to indicate that this is the case, but many of our team members were pretty certain.

Thanks for the replies. Good to know.

Hastypickle 07-03-2010 19:46

Re: On mecanum wheels
 
Mecanum wheels work when in a rectangular configuration, although I can see how some people may think they must be in a square if they are told that the wheels must be in an x configuration when viewed from the top.

Ed Sparks 07-03-2010 20:09

Re: On mecanum wheels
 
Quote:

Originally Posted by Patrick Chiang (Post 933090)
Would purchased mecanum wheels work as well if placed in a rectangle instead of a square like they're supposed to?

We're living proof. We're running in a recangular configuration with absolutely no issue.

Alan Anderson 07-03-2010 23:06

Re: On mecanum wheels
 
Holonomic drivebases really work best if the rollers touching the ground are all directed right at the same point (usually the center of the robot). With 45-degree mecanum rollers, that does mean a square is optimum. But a rectangle still works fine, with only a tiny bit of power lost due to scrubbing friction.

Chris is me 08-03-2010 10:01

Re: On mecanum wheels
 
Quote:

Originally Posted by alicen (Post 933094)
omnis are the ones generally put in a square pattern

Omnis don't even "need" a square either, though they can be really annoying in a rectangle.

Ether 08-03-2010 13:38

Re: On mecanum wheels
 
Quote:

Originally Posted by Alan Anderson (Post 933331)
Holonomic drivebases really work best if the rollers touching the ground are all directed right at the same point (usually the center of the robot).

Just to be clear, for those unfamiliar:

"Holonomic drivebases really work best if the perpendicular bisectors of the axles of the rollers touching the ground are all directed right at the same point"

TheDominis 08-03-2010 14:02

Re: On mecanum wheels
 
Our robot is using mecanums in a rectangular configuration. It works very well.


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