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  1. The CNC machining die and punch are made up of High Carbon High Chromium Steel. A semi–perforation is fashioned by piercing a hole solely part way via the thickness of the steel. A semi–perf may be be} used as a rivet or to find other parts throughout assembly. A important design parameter is the space by which the sensor protrudes from the floor of the stamping device, known as clearance. Such local distortions of the stress distribution change the unique in-situ stress distribution and therefore must be avoided.