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Re: Mecanum Drive control
I could be wrong, but I believe he's suggesting that mecanum rollers are prone to "sticking" and not rolling freely (this would be consistent with my experience of certain brands/models of mecanum wheel). Under these conditions, the wheels of a strafing mecanum robot could be said to "slip," and throw off the correspondence between encoder readings and movement.
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Member, FRC Team 449: 2007-2010
Drive Mechanics Lead, FRC Team 449: 2009-2010
Alumnus/Technical Mentor, FRC Team 449: 2010-Present
Lead Technical Mentor, FRC Team 4464: 2012-2015
Technical Mentor, FRC Team 5830: 2015-2016
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