Fanuc G74 Left-hand Peck Tapping Cycle
Fanuc G74 is used for left-hand tapping on cnc mill. Tapping with Fanuc G74 tapping cycle is performed by rotating the spindle counter-clockwise.
For a complete article about Fanuc G74 tapping cycle read G74 Left-hand Tapping Cycle or Reverse Tapping Cycle
Fanuc cnc controls gives the cnc machinists the ability to do left-hand tapping with added benefit of Peck Tapping.
Tapping a deep hole may be difficult due to chips sticking to the tool (tap) or increased cutting resistance,
So Fanuc G74 peck tapping cycle makes this whole process easier for cnc machinists.
Programming
G74 X Y Z R Q F
Parameters
| Parameter | Description |
|---|---|
| X Y | Hole position data |
| Z | Z-depth (feed to Z-depth starting from R plane) |
| R | Position of the R plane |
| Q | Depth of cut for each cutting feed (Peck depth). |
| F | Cutting feedrate |
G74 Left-hand Tapping Cycle can create a peck at a value of Q?
if programmed with either
a short chip break retraction or
a full retraction
as set in parameter 5200 #5 (1 = full retract).
At Z finish position the tool retracts at twice speed/feed automatically.
Example
S1000 G74 G99 X10. Y10. Z-25. R2. Q5. F1.25 M4 X30. Y20. G0 G90 G80 Z100
