Fanuc G74 Left‑Hand Peck Tapping Cycle for CNC Milling – Precise Reverse Threading
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
CNC Machine
- Mastering CNC Fanuc G76 Threading Cycle: Comprehensive Guide
- Efficient Peck Drilling on a Fanuc CNC Lathe Using G74 Cycle
- Master the Fanuc G75 Grooving Cycle for Precise CNC Operations
- Fanuc G84 Rigid Peck Tapping Cycle – Expert Guide to Deep Hole Tapping
- G74 Left-Hand and Reverse Tapping Cycle – Complete CNC Programming Guide
- Fanuc G85 Boring Cycle – CNC Mill Programming Guide
- Fanuc G76 Fine Boring Cycle: Video Demo & CNC Mill Tutorial
- Master Fanuc G76 Fine Boring Cycle for Precision CNC Milling
- Master Fanuc G71 Turning & G74 Peck Drilling on CNC Lathes: A Practical Programming Exercise
- Fanuc G84 Tapping Cycle: Complete Guide & Syntax