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2.     Safety Block

a.      The safety block should exist at the start of every program, and is typically on the third line:

G00 G28 G40 G54 G80 G97


G00 – Rapid Motion Positioning Mode

G28 – Return To Machine Zero (Home) Positon

G40 – Tool Nose Compensation Cancel

G54 – Select Work Coordinate System

G80 – Canned Cycle Cancel

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