Last year, my team had luck improving consistency in a similar situation by
making sure the wheels were wiped clean (just with a dry rag) each time
before a run.  Turned them into a little bit obsessive with the cleaning
but definitely improved consistent start, turn, stop.

On Mon, Oct 7, 2019 at 10:01 PM Amy Nichols <[log in to unmask]> wrote:

> This actually seems to be problem with the mat, I believe. We’ve run the
> same robot on multiple mats...and then other robots on this board. The
> robots run on this board skid and slip along the mat mainly when the robot
> turns...but who knows? Very time is a surprise. :) It really seems to be a
> problem with the quality of the mat. At first, we thought it had to do with
> how much it was used - possibly newer mats still had a glossy film on it or
> something. But that doesn’t seem to be the case, as we ran the same robots
> on a mat right out of the box without any of these issues. So...we don’t
> know and were just wondering if it’s our sole mat or if others were having
> trouble as well?
>
> Weird.
>
> Thanks much,
> Amy
>
> Sent from my iPhone
>
> On Oct 7, 2019, at 9:02 PM, Skip Morrow <[log in to unmask]> wrote:
>
> First, verify that you have wheel slip. Film it in slo motion. Does it
> happen every time? Does setting a slower speed help? Going from zero to 100
> in a blink is pretty much always going to cause some slip. Especially if
> you have big wheels. Also, is your robot balanced? Maybe you have a heavy
> attachment on one side? That can throw things off by taking a lot of weight
> off of one wheel which can cause it to slip more easily. Finally, for a
> really advanced solution you can try and write an acceleration myblock.
> Otherwise, the only solutions are to ensure your robot is balanced, and use
> slower speeds.
>
>
> On Mon, Oct 7, 2019 at 8:26 PM Alicia A. Strahan <[log in to unmask]>
> wrote:
>
>> Accelerating from start.  Wheels spin but it doesn’t grip on the mat.
>> Doesn’t happen every time but throws off the robot just enough to mess up
>> the mission.
>>
>> Get Outlook for iOS
>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__aka.ms_o0ukef&d=DwMFaQ&c=eLbWYnpnzycBCgmb7vCI4uqNEB9RSjOdn_5nBEmmeq0&r=k6Oa5GxfBPFMgGjb2r5QIoEOeBZs9xbNIpA0kLw_kFQ&m=thvGt952Yyu0iqagWEo60249q5tBHIFX2KClcuP3KmM&s=zmPPxGnUtUwh1QX3eM52aiobdS7XvXBlMYeN07OknQI&e=>
>> ------------------------------
>> *From:* Skip Morrow <[log in to unmask]>
>> *Sent:* Monday, October 7, 2019 8:04:22 PM
>> *To:* Alicia A. Strahan <[log in to unmask]>
>> *Cc:* [log in to unmask] <[log in to unmask]>
>> *Subject:* Re: [VADCFLL-L] Robot skidding on board
>>
>> What do you guys mean by "skidding"? When I think of skidding, I think of
>> putting on the brakes, locking up my tires, and screeching to a stop. That
>> obviously doesn't apply here.
>>
>> Are you talking about a general loss of traction, leading to robot
>> inaccuracy? If so, are we talking mostly during turns? Or accelerating from
>> a dead stop?
>>
>>
>>
>> On Mon, Oct 7, 2019 at 3:22 PM Alicia A. Strahan <[log in to unmask]>
>> wrote:
>>
>>> We have noticed a problem as well.  It does not happen every time and
>>> does not happen when we run the code on a different surface like the
>>> floor.
>>>
>>> *Alicia Strahan*
>>> STEM Lab Teacher
>>> Rosa Parks Elementary School
>>>
>>> ------------------------------
>>> *From:* First Lego League in Virginia and DC <[log in to unmask]>
>>> on behalf of Alina Marston <
>>> [log in to unmask]>
>>> *Sent:* Monday, October 7, 2019 3:01 PM
>>> *To:* [log in to unmask] <[log in to unmask]>
>>> *Subject:* [VADCFLL-L] Robot skidding on board
>>>
>>> Hi everyone,
>>>
>>>   My team is having trouble with our robot wheels skidding on our board.
>>> My team has tested their robot on two other boards and the robot's wheels
>>> do not skid when turning on the other two boards, but they do skid when
>>> they turn on ours. We had another team test their robot and programs on our
>>> board last week and their wheels skidded also when running on our board. In
>>> all, we've tested three other robots on the other two boards and none of
>>> them skid like on ours at home. Has anyone else had this problem?
>>>
>>> Thanks!
>>> Alina Marston
>>> The Magically Energized Lightning Waffle Bunnies
>>>
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