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To perform drilling operations, a drilling cycle G81 is used.

G84 X... Y... Z... R...  F... K...

 X Coordinate X of the hole center.
  Y Coordinate Y of the hole center.
  Z Drilling depth (from R-plane to Z position).
  R R plane position.
  F Feedrate.
  K Number of drilling cycles (if more than one cycle is required).


How G81 Drilling Cycle works.

G81 - Drilling Cycle

1 - Fast movement to X,Y coordinates of the hole center.
2 - Fast movement to R plane.
3 - Drilling operation (Z-depth).
4 - Fast movement to R plane or Initial level.

G98 and G99 modes.

G98 - Drill will go to the initial level.
G99 - Drill will go to R plane.

Example of using G81 in an CNC program (G-code).

O0001 (G81 example)    (Program number (O0001) and Program name (G81 example)
G00 Z0.5                                (Safe Z)
G00 X16 Y23                           (go to X,Y coordinates of the hole center)
G81 X16 Y23 Z-12 R5.2 F50       (Z-drilling depth)
G00 Z0.5                              (Safe Z)
G00 X0 Y0                            (go to machine Zero)
M30                                    (End)

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