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Understanding CNC Drill Exercise: Modal and Non-Modal G-Codes Explained

This guide covers essential aspects of CNC drill exercises, emphasizing the distinction between modal and non-modal G-codes. Modal G-codes like G0, G1, and G54 remain active until replaced, impacting all subsequent blocks. Conversely, non-modal G-codes like G28 and M01 affect only the current block. Learn how to utilize cutting cycles, tool changes, and workpiece coordinates efficiently in CNC programming to optimize your drilling and milling operations. Understanding these codes is crucial for successful CNC machining.

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Understanding CNC Drill Exercise: Modal and Non-Modal G-Codes Explained

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  1. CNC DrillExercise * 1 *

  2. Modal: G code will remain in effect for all blocks unless replaced by another modal G code G0 G1 G20, G54, M03, M07, M40 Non modal: The G code will only affect the block in which it appears G28 M01,M02, M30, M06 G & M code Fall into one of two major categories:

  3. Work piece coordinates G30 G28

  4. Heading • O _ _ _ _ G0 G40 G80 G90 • ( Rapid positioning, Cutter compensation cancel, fixed cycle cancel, absolute command) • G91 G30 Y0 ( G30 second Zero return) • M6 • G90 G54 G43 X_ _ _ Y _ _ _ Z3. H _ _ S_ _ _ M3 • (G54 work coordinate system 1 selection)

  5. Main body • G28 Z3. M9 ( G28 zero return, M9 coolant off) • G91 G30 Y0 • G90 • M1 (optional stop) • N _ _ _ _ T _ _ • M6 (tool change) • G54 G43 X _ _ . _ _ _ Y _ _ . _ _ _ Z3. H _ _ S _ _ _ M3 • (x , y , z position data) • M8

  6. End of Program • G28 Z3. M9 (MAY BE G 80 or G40) • G91 G30 Y0 (G90 incremental command) • G90 M33 ( return tool in the spindle to magazine) • M30 (end of program)

  7. 2 6 5 1 3 4

  8. Tape

  9. PREPARATORY FUNCTION • 4 peck drill;Table moves to selected location. Peck drill cycle initiated upon arrival at location. Cycle time set by timer on console. • 5 DRILL:Table moves to selected location. Spindle moves down rapidly to preset feed point, proceeds at set feed rate to final depth and retracts rapidly. • 6 MILL:Spindle moves down rapidly to set feed point, proceeds at set feed rate to final depth and then at set mill feed rate to selected location.

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