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| | Likely Cause | Solution | |-------------|------------------|---------------| | Undefined variable pstoday | Post is for newer Mastercam version | Run UpdatePost utility (Start Menu → Mastercam 2025 → Update Post) | | A-axis rotates the wrong way | Incorrect axis direction | Open .PST in editor, find rot_dir : 1 , change to -1 or 1 | | Coolant won't turn off (M09) | Missing coolant off command | Add "M09", e$ in ptlchg$ and pretract$ blocks | | Post outputs G53 instead of G28 | User-modified homing block | Replace "G53", "Z0." with "G28", "G91", "Z0." | | No spindle speed on first tool | Missing speed variable | In psof$ , ensure speed is called before spindle$ | find rot_dir : 1