Robot only stalls in matches

  1. 10 months ago

    Does anyone else have this issue? Before our state tournament, we had practiced over and over on our home field for up to 10 minutes at a time with the same batteries and never had stalling problems. It was only plugged into the field controllers at the tournament where our drive stalled basically EVERY time. And we have thought about factors such as defensive play (no one ever did) and even changed our cortex out.
    Oh and our drive is a 6 motor high speed hybrid base (tank in front, x drive in back). We do know that the x drive decreases torque, but don't think that it should have this much of an effect on it.

  2. meng

    14 Jan 2018 Singapore 8059

    Is there any anti-static spray on the field?

  3. Scott_kalaf

    15 Jan 2018 California 2496Y

    Did your entire robot stall? or just the drive?

  4. 917F

    15 Jan 2018 Redmond, Washington

    Hmmm we experienced something similar at our competition yesterday. Interested in hearing what people have to say about this. 6 motor high speed on a 12 lb robot should have never tripped the ptc during normal match play.

  5. jrp62

    15 Jan 2018 V5 Beta Tester Michigan 33 & 3333

    Is your home field a real field that uses the foam tiles? Sounds like it is, but have to ask.

  6. VexGod8110x

    15 Jan 2018 Mankato MN XD

    I think it’s a static issue. Here in Minnesota in the winter this is a huge problem and always happens in practice so we drag a grounding wire so that the static dissapates as it builds up.

  7. 9 months ago

    @meng Is there any anti-static spray on the field?

    In Hawaii so no.

  8. @Scott_kalaf Did your entire robot stall? or just the drive?

    Just the drive.

  9. @917F Hmmm we experienced something similar at our competition yesterday. Interested in hearing what people have to say about this. 6 motor high speed on a 12 lb robot should have never tripped the ptc during normal match play.

    Yeah it's extremely odd.

  10. @jrp62 Is your home field a real field that uses the foam tiles? Sounds like it is, but have to ask.

    Yes.

  11. @VexGod8110x I think it’s a static issue. Here in Minnesota in the winter this is a huge problem and always happens in practice so we drag a grounding wire so that the static dissapates as it builds up.

    Grounding wire? Do you have an extra wire attached to your chassis just for that purpose? Could a dragging motor wire cause this?

  12. VexGod8110x

    24 Jan 2018 Mankato MN XD

    @Molokai Robotics we just used a stripped wire and have it drag on the ground so it dissipates the static that builds up in matches and when just practicing. Farmers do this on their combines when harvesting to keep dust off and static out of the machine.

  13. @VexGod8110x Do you mind sharing a picture of how you mounted the stripped wire? I'm interested in trying it. Does it need to be pushed against the ground, or will gravity be enough to drag it on the ground? My concern with a just a wire, and nothing pushing it to the ground, is that it may get bent upward once the robot crosses the starting bar.

  14. Aponthis

    24 Jan 2018 Tempe, Arizona Formerly 127A, 127C, 127X

    @_Colossus_ @VexGod8110x Do you mind sharing a picture of how you mounted the stripped wire? I'm interested in trying it. Does it need to be pushed against the ground, or will gravity be enough to drag it on the ground? My concern with a just a wire, and nothing pushing it to the ground, is that it may get bent upward once the robot crosses the starting bar.

    Then just put it on the back of your robot (this is assuming the back of your robot never goes over the starting bar; ours doesn't, so it's a great place to mount our position tracking wheel).

  15. 917F

    25 Jan 2018 Redmond, Washington

    @VexGod8110x I don't think a stripped wire dragging on the ground would be competition legal

  16. There is nothing in the rules preventing you doing it so it would be legal.

  17. TheColdedge

    25 Jan 2018 Event Partner Columbus, Indiana 1483
    Edited 9 months ago by TheColdedge

    @Ethan W. There is nothing in the rules preventing you doing it so it would be legal.

    This is not legal.

    <R15> Parts may NOT be modified as follows:
    a. Motors (including the internal PTC), extension cords, sensors, controllers, battery packs,
    reservoirs, solenoids, pistons and any other electrical component or pneumatics component
    of the VEX Robotics Design System may NOT be altered from their original state in ANY way.

    it was previously asked on the forum. Link

  18. Edited 9 months ago by Ethan W.

    We use a vex wire, it seems to work well with us. We have an old one that is broken and messed up, with exposed wire.

  19. TheColdedge

    25 Jan 2018 Event Partner Columbus, Indiana 1483
    Edited 9 months ago by TheColdedge

    @Ethan W. We use a vex wire, it seems to work well with us. We have an old one that is broken and messed up, with exposed wire.

    That's still modified. It may pass inspection at the local comps, but won't fly at Worlds or the US open.

    I'd love to see a proper static drag, but its not worth bending/breaking the rules to get one.

  20. I can see your point. You are right.

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