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   Bookmark and Share    CNC G-codes.G86 command - Boring Cycle  for rough holes                                                            

G86 Boring cycle is used for boring rough holes or holes that require additional machining operations..

This boring cycle is very similar to the drilling cycle G81.

The difference is that when using the boring cycle G86, the machine spindle stops at the bottom of the hole.

G86 X... Y... Z... R... 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.
  F Feedrate.
  K Number of boring cycles (if more than one pass for boring is required).


How G86 Boring Cycle works.

G86 Boring Cycle

1 - Rapid positioning to X,Y coordinates of the hole center.
2 - Rapid positioning to R plane.
3 - Boring operation (Z-depth).
4 - Machine spindle stop.
5 - Rapid positioning to.R plane (G99) or initiallevel (G98)

G98 and G99 modes.

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

Example of using G86 in an CNC program (G-code).

O0001 (G86 CNC program example)   
G00 Z0.25                             (Safe Z)
G00 X135 Y169                       (go to X,Y coordinates of the hole center)
S1500 M03                           (Spindle CW, n=1500)
G86 X135 Y169 Z-25 R10 F1.5     
G00 Z0.25                              (Safe Z)
G00 X0 Y0                            (go to machine Zero)
M30                                    (End)

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