Never go straight to cutting metal. Load the program into your CNC, set up safe Z clearance, and run a dry run with the feed override at 0% and rapid override at 25%.
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A: In Mastercam 2018, posts are predominantly .pst . The .pstx format came later (Mastercam 2020+) for XML-based posts. Do not try to use .pstx in 2018. Never go straight to cutting metal