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G84 tapping cycle can create threads.

Thread cutting in the hole is carried out by rotating the machine spindle clockwise.
Then, upon reaching the required depth of the thread in the hole, the spindle starts to rotate in the opposite direction to remove the tool.

G84 X... Y... Z... R... P... F... K...

 X X coordinate of the hole center.
  Y Y coordinate of the hole center.
  Z Depth (from R-plane to Z-depth)(final depth of tap before retract).
  R R plane position.
  P Dwell time.
  F Feedrate.
  K Number of threading cycles (if more than one pass is required).


How G84 Tapping Cycle works.

G84 Tapping Cycle

1 - Rapid positioning to X,Y coordinates of the hole center.
2 - Rapid positioning to R plane.
3 - Tapping operation (Z-depth).
4 - Dwell for time specified with parameter P.Spindle is rotated counterclock-wise.
5 - Tap is retracted with the specified feed.
6 - Tap is moved to initial-level (G98).

G98 and G99 modes.

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

Example of using G84 in an CNC program (G-code).

O0001 (G84 example)    (Program number (O0001) and Program name (G84 example)
G00 Z0.5                             (Safe Z)
G00 X-80 Y70                       (go to X,Y coordinates of the hole center)
S1000 M03                           (Spindle CW, n=1000)
G84 X-80 Y70 Z-25 R10 F1.5       (Z-final depth of tap before retract)
G00 Z0.5                              (Safe Z)
G00 X0 Y0                            (go to machine Zero)
M30                                    (End Program)

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