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Getting two stepper motors to sync

Discussion in 'Motors' started by Mark Savoia, Oct 6, 2018.

  1. Mark Savoia

    Builder

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    I have set up the OPENBUILDS ACRO 1510 and controlling it via an Arduino Mega board. The two long rails each have a motor mounted on the ends of the short rail just like the instructions describe. I have tried having each motor controlled by its own stepper motor control and also have tried both motors controlled by a single stepper motor control. One of the motors is intentionally wired backwards so it will travel in same direction as other motor. This works with either setup and did not help my issue.

    The problem I am having is keeping them in sync. I have first measured the distance from each motor to the end of the rig making sure it is equal and square. After moving the rail back and forth a few times with the Arduino they end up different distances, in other words, racked.

    I have made sure gears and belts are tight. Since using one stepper motor control to control both ( I feel that should be the most accurate) I assume they are both getting the same amounts of steps and amperage.

    Any suggestions what might be happening?
     

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  2. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder

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    sounds like you have a sticky spot in one rail. if you turn the power off and push the gantry around with a finger you will probably feel where it gets stiff. you may need to loosen the Vwheels on that side to allow free movement at speed. if you drive it really slowly it will probably stay in sync. but slow is no all that useful for a laser (-:
     
    Mark Carew likes this.
  3. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder

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    and by the way, the right way is to use a driver for each motor.
    if you put 2 motors on one driver they only get half the current each, and so half the power.
     

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