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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.

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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