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Explanation on jog distance VS percentage

Discussion in 'Control Software' started by magicgilloux, Feb 10, 2024.

  1. magicgilloux

    Builder

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    Hello,
    and sorry for this question but I need an explanation with the "jog incremental VS distance VS percentage"
    first some details,
    my machine is a custom milling machine that I retrofit.
    Ball screw 1605/5mm pitch
    servo motor HBS57 2.2N
    controler HBS57SH setup with 3600 pulse/rev
    Ramps 1.4
    Arduino mega with MEGA 5X firmware in.
    Using Openbuild Control Software last version.
    and I'm workoing on a MacPro M2.
    after all this, my question is simple,
    how can I set the jog functionality to give the value I want
    Jog increments is set by default to 10mm increments. I want it to move 10mm.
    Moving the cursor percentage if I put 100% the stepper motor staled
    Cursor at 50% give me of course a movement of 5mm
    cursor at 1% give a movement of 9.9mm
    I cannot get how to have a real 10mm movement
    If one can explain to me how I can change, set up or just understand how it works.
    Please note results are the same for setting 100mm 0,1 increments
    Thanks a lot for your help
     
  2. Misterg

    Misterg Veteran
    Staff Member Moderator Builder Resident Builder

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    The slider only controls jog speed. If the motor stalls, you have the max rate or acceleration set too fast.

    If you have your speed and acceleration settings tuned and the axis properly calibrated, a 10mm jog will move 10mm regardless of the jog speed slider setting.

    Have a look here for how to tune these:

    Configuring Grbl v0.9

    Since you still have an issue at 50% speed, it sounds like you need to significantly reduce your current speed / acceleration settings to start with (try 25% of your current values or less).

    Once the machine is working reliably, you can then tweak these settings back up again to find the values that start to give problems, then back them off by ~20% to give settings that are reliable.
     
    Peter Van Der Walt likes this.
  3. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

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    Or stepper drivers to weak

    Probably running little stepstick drivers?
     
  4. magicgilloux

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    Thanks a lot all for your replies I will have a look on the acceleration as this is the setting I didn't chnage until now
     

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