G34 - Mechanical Gantry Calibration

Description

This command is used to align the ends of the X gantry. See the video demonstration below.

• The carriage moves to GANTRY_CALIBRATION_SAFE_POSITION, also called the “pounce” position.
• If possible, the Z stepper current is reduced to the value specified by S (or GANTRY_CALIBRATION_CURRENT) to prevent damage to steppers and other parts. The reduced current should be just high enough to move the Z axis when not blocked.
• The Z axis is jogged past the Z limit, only as far as the specified Z distance (or GANTRY_CALIBRATION_EXTRA_HEIGHT) at the GANTRY_CALIBRATION_FEEDRATE.
• The Z axis is moved back to the working area (also at GANTRY_CALIBRATION_FEEDRATE).
• Stepper current is restored back to normal.
• Finally the machine is re-homed, according to GANTRY_CALIBRATION_COMMANDS_POST.