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M01 Optional stop

Haas NGC M-code · Mill, Lathe

On mills: Optional stop

Stops the program only when the Option Stop key is on. Otherwise it is ignored. Use it after each tool to check the work.

Format

How it works

Not modal. Acts once on the line where it is commanded.

Example program

Example is in inch. Check offsets and clearances first.

Watch out for

• Turn Option Stop off for production runs, on for first part prove out.

On lathes: Optional stop

Works like M00 but only stops when OPTION STOP is turned on at the control.

Format

How it works

Non-modal.

Example program

Example is in inch. Check offsets and clearances first.

Watch out for

• Place M01 after each tool so the operator can check the first part.
• Restart the spindle with S and M03 in the next tool block.

Related codes

M00 · M30

M01 on other controls

The same number can mean something different on another control.