The value and format displayed depends on the controller used. Like much of LightBurn, the user interface displays things in a format specific to your setup.
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If you have a DSP or Galvo controller, the value will be shown as “steps per rotation”, IE, the number of motor pulses the controller needs to send to spin the roller a full turn.
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If you have a GCode device and you’re using a dedicated rotary axis (the A axis), the value is displayed as ‘degrees per rotation’, meaning the number of degrees we need to move the motor to turn the rotary roller one full turn (gearing between the motor and roller might mean it’s not 360). This assumes that the A axis has already been configured in the firmware to rotate the motor one full turn when we send a 360 degree move.
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If you have a GCode device and you’re using the Y axis, you’re entering the number of mm of travel along the Y that makes the roller spin one complete turn.