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Tolerance issue: HELP

Discussion in 'CNC Mills/Routers' started by P.Abraham, Dec 4, 2020.

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  1. P.Abraham

    P.Abraham New
    Builder

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    Hi there,

    I’m having an issue where in my y-axis leadscrews don't travel the same distance. The discrepancy is only about 2-3mm between the 2 sides. but it throws off every cut I make. Tolerances are non-existent.

    Example
    starting from the back of the machine (square and flush with the frame), by the time the gantry reaches the end of travel, Y1 = 1000 but Y2 is 997

    I’ve troubleshooted the following
    1. Tensioning leadscrews
    2. C-Beam length measurement

    not sure if it’s stepper motor current, mm/step calibration (done), something to do with the thrust bearings... proper stuck.

    Any help appreciated
     
  2. Peter Van Der Walt

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

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    Check (and loctite) grubscrews on the shaft couplers (motor and leadscrew sides both)
     
  3. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

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    and balance the current settings, ie make them both the same for Y and Y2
     
    Christian James likes this.

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