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How to use mach3 to quickly set the knife

During Z knife setting, one end of the fish mouth bai is clamped on the PCB in contact with the copper foil, and the other is clamped on the tool du. When the “Z knife setting” button is pressed, the Z axis automatically moves the knife at the speed of F100. The moment the tool tip touches the PCB, that is, when pin 13 of the parallel port changes from high level to low level, the cutting stops, the Z axis automatically raises the tool 20 after the Z coordinate is automatically reset, and the Z tool setting is completed.
To set the knife in MACH3, you must use VB script to proceed.

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