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Mastering Tapered Threading on Fanuc G76 CNC Lathes

Taper threading is not a usual practice in cnc machine workshops, but sometimes customer want a component with taper threading, So here is the solution. Taper threading on a cnc lathe machine with Fanuc control is just easy with Fanuc G76 threading cycle. Fanuc CNC control threading cycle G76 gives us lot of flexibility.CNC Programming tapered threading with Fanuc threading cycle G76 is not that difficult, just one parameter have to add.

Normal Threading with Fanuc G76 Threading Cycle CNC Program

N5 G76 P010060 Q100 R0.05
N6 G76 X30 Z-20 P1024 Q200 F2

One G76 parameter which have to be added for tapered threading is R in G76 second block.

Tapered Threading with Fanuc G76 Threading Cycle CNC Program

Mastering Tapered Threading on Fanuc G76 CNC Lathes

Tapered Threading with Fanuc G76 Threading Cycle

N5 G00 X50 Z5
N6 G76 P010060 Q100 R0.05
N7 G76 X43 Z-45 P1024 Q200 R-14.5 F2

Other parameter of Fanuc threading cycle G76 are explained here.

The R parameter in second block of G76 is the tapered value. Note that R is given as Radius value.

How to calculate R parameter for Tapered Threading on Fanuc with G76 Threading Cycle.

R = (Start Diameter – End Diameter) / 2


CNC Machine

  1. Mastering CNC Fanuc G76 Threading Cycle: Comprehensive Guide
  2. Mastering Thread Infeed Angles Using Fanuc G76 Threading Cycle
  3. Master Fanuc G76 Threading Cycle: A Complete Guide for CNC Machinists
  4. Efficient Multi‑Start Threading on Fanuc CNC with the G76 Cycle
  5. Mastering the Fanuc G92 Threading Cycle: Simple Programming & Precision Control
  6. Efficient Taper Threading with G92: A Complete CNC Guide
  7. Internal Threading on Fanuc 21i/18i/16i Using the G76 Threading Cycle
  8. Efficient External Thread Cutting Using G76 Cycle on Fanuc 21i, 18i, and 16i CNC Machines
  9. Understanding the G78 Threading Cycle in Fanuc Lathe Programming
  10. Effortless CNC Threading with Mach3 Turn G76 Canned Cycle