M04 – Spindle ON (Counter Clockwise)
This command starts the spindle in counter clockwise direction at the RPM set by the S command
Syntax & Parameters
M04 – Clockwise command followed with or without S value.
S – The S value defines the required RPM. If the S value is not given then the last S value is automatically used.
N10 M04 S1200
In this example the spindle is started in counter clockwise direction at 1200 RPM.
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