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G73 - Canned Cycle - High Speed Peck Drill

The G73 cycle is intended for deep drilling or milling with chip breaking. See also G83. The retracts in this cycle break the chip but do not totally retract the drill from the hole. It is suitable for tools with long flutes which will clear the broken chips from the hole. This cycle takes a Q number which represents a "delta" increment along the Z-axis.

Program: G73 X~ Y~ Z~ A~ R~ L~ Q~

  • Preliminary motion, as described in G81 to 89 canned cycles.
  • Move the Z-axis only at the current feed rate downward by delta or to the Z position, whichever is less deep.
  • Rapid back out by the distance defined in the G73 Pullback DRO on the Settings screen.
  • Rapid back down to the bottom of the current hole, but backed off a bit.
  • Repeat steps 1, 2 and 3 until the Z position is reached at step 1.
  • Retract the Z-axis at traverse rate to clear Z.

It is an error if the Q number is negative or zero. The following sample program demonstrates the G73 command.

  • G73 Example

    Last Updated Feb 28, 2011
    - Download G73 Code Example   

    (Sample Program G73EX20:)
    (Workpiece Size: X4, Y3, Z1)
    (Tool: Tool #3, 3/8" HSS Drill)
    (Tool Start Position: X0, Y0, Z1)

    N2 G90 G80 G40 G54 G20 G17 G50 G94 G64 (safety block)
    N5 G90 G80 G20
    N10 M06 T3 G43 H3
    N15 M03 S1200
    N20 G00 X1 Y1
    N25 G73 Z-0.75 R0.125 Q0.0625 F5 (Invoke G73 cycle)
    N30 X2.0
    N35 X3.0
    N40 Y2.0
    N45 X2.0
    N50 X1.0
    N55 G80 G00 Z1 (Canned cycle cancel)
    N60 X0 Y0
    N65 M05
    N70 M30

  • All Machine Code Reference Examples

    Last Updated Sep 16, 2016
    - Download Machine Code Reference Examples