1. 6 months ago

    Hello!

    I was wondering if anyone knows why our base is stalling? And if so, how to fix it. We have the 3:1 sprocket ratio

  2. Easton

    4 Dec 2017 GA, USA 1958A

    There are many possible causes, answering some questions would help diagnose the problem. To me it sounds like it's due to the 3:1 gearing, but I'm not sure.

    1. How many motors on the base?
    2. What is the internal gearing of the motors?
    3. Have you checked for friction?
    4. Approximately how heavy is your robot?
  3. Randor4478

    4 Dec 2017 Monroe, Connecticut 4478X

    If it is 3:1, I would put it back to 1:1. It is generally not good to gear wheels for speed as it often results in not enough torque for the wheels to move causing the base to stall

  4. Easton

    4 Dec 2017 GA, USA 1958A

    @Randor4478 If it is 3:1, I would put it back to 1:1. It is generally not good to gear wheels for speed as it often results in not enough torque for the wheels to move causing the base to stall

    I agree. It's probably possible to get away with 3:1 torque with a light bot, but that isn't neccessary when HS and turbo are available. Not to mention the power loss due to chain.

  5. [SPR] JP

    4 Dec 2017 Texas PANDA

    Is the bot steel

  6. NightsRosario

    4 Dec 2017 Reisterstown/Catonsville, MD 3922A

    How many motors are you dedicating to it? 3:1 is not that obscene of a ratio. I saw some teams get away with it in NBN. If you are not dedicating >= 6 motors on it, well there's your problem. If you are and it's still stalling, I would recommend weighing your robot and doing some basic stall torque calculations to figure out what weight you need to be at.

  7. LEER

    4 Dec 2017 UK 46644

    Are you using the 6 tooth high strength sprockets?

  8. @Easton :

    there are four total motors on the base
    they are standard speed motors
    yes, the wheels are available to move at ease
    about 13 lb

  9. Edited 6 months ago by Alpha Dream <3

    @LEER

    no 6 tooth, but we are using 24T high strength and 8T high strength sprockets

  10. we will try moving it back to a 1:1 sprocket ratio. Do you believe it is safe to put 6 total motors, 1:1 ratio, and high speed motors? or is the high speed motors too risky?

  11. Edited 6 months ago by Alpha Dream <3

    @SkinnyPanda Robotics

    there are four linear slides on the bot, so those are the only steel items

  12. Easton

    7 Dec 2017 GA, USA 1958A

    @Alpha Dream&nbsp;<3 we will try moving it back to a 1:1 sprocket ratio. Do you believe it is safe to put 6 total motors, 1:1 ratio, and high speed motors? or is the high speed motors too risky?

    6 Motors with 1:1 high speed is definitely possible. You could even do Turbo motors with the same configuration. You could even do 4 Speed motors like lots of teams do. Just make sure to avoid friction and you'll be fine.

 

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