I wonder if this spot is consistent on all mats. Sounds like a pothole.
Could the color in that location be causing it? We have 3 teams at my
school, 3 mats. We could try running over the same area to see. On the plus
side, programming to adjust to this spot would work and since your
competition rounds are done on your home mat, well you have home field
advantage. Does your team feel comfortable sharing an image of the spot in
question?
Mark Nottingham
6th Grade Science Teacher
First Lego League Robotics Coach- CCMS Team 31516
Carroll County Middle School
Carroll County Public Schools
(276)728-2382
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On Mon, Jan 4, 2021 at 8:44 PM Skip Morrow <[log in to unmask]> wrote:

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> VA-DC Coaches. Hoping someone can help us.
>
> Our robot normally runs very straight. But lately we have been noticing a
> couple of spots on the mat where our robot will almost always do a short
> jog to the left of about one cm. The spots are very specific and the
> sidestep happens with near 100% regularity. Everywhere else on the mat, the
> robot drives perfectly. We have tried cleaning the wheels many times. The
> mat seems clean, but there are some wear marks in the problem areas. It
> sure doesn't feel greasy or slippery or tacky in those specific areas. I am
> at a loss. I am hesitant to try cleaning the mat with anything, but I'd
> like to hear if any of you guys have any ideas.
>
> To be clear, it is a very specific spot. We can program in a move tank
> block, 10 revolutions, and aim the robot to pass over the spot. No matter
> how far away we are at the start, it will shift at that same spot.
>
> Coach Skip Morrow
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