Ramps 1.4

This topic contains 2 replies, has 2 voices, and was last updated by  drbytes 2 months, 3 weeks ago.

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  • #69638

    drbytes
    Participant

    I’m nearing the end of my hardware build and I’m about the tackle the electronics.

    I have an old working ramps 1.4 with A4988 drivers here that never got used in a project but while I wait for the mini rambo I would like to use it to troubleshoot any issues with the mechanical aspects. I read that the firmware provided is set up for another driver, the DRV8855 , and the A4988 only have half the steps to work with. So the question is related to the firmware, what to I change to get the steps right with the A4988 ?

    I saw this line :

    #define DEFAULT_AXIS_STEPS_PER_UNIT { 200, 200, 800, 200 } //MPCNC

    Do I half these numbers for the A4988 like so ? :

    #define DEFAULT_AXIS_STEPS_PER_UNIT { 100, 100, 400, 100 } //MPCNC

     

    Thanks!

    #69640

    BT
    Participant

    That should work. The z-axis number is based on a leadscrew instead of a threaded rod.  The last number is for the extruder if you’re going to use the MPCNC as a 3D printer.

    3 users thanked author for this post.
    #69917

    drbytes
    Participant

    Yup, that worked, thanks for confirming!

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