CNC Fanuc G76 Threading Cycle
Threading is an integral part of almost every component which is machined,
threads may be internal (ID threading) or external (OD threading). Here is full
explanation of G76 Threading Canned Cycle for the Fanuc cnc control.
You might like other cnc threading cycle G92, G32, G33,
- CNC Fanuc G92 Threading Cycle
- CNC Fanuc G33 G32 Threading G Code
- G76 Threading Cycle One Line Format for Fanuc 10/11/15T
Below 2 block Fanuc G76 threading cycle ( Two Line Format G76 Threading
Cycle) is briefly explained for easy understanding of g76
threading code.
Contents
- Fanuc G76 Threading Cycle can be used for
- Fanuc G76 Threading Cycle Flexibility
- G76 Threading Cycle Example
- Fanuc G76 Threading Cycle Explanation
Fanuc G76 Threading Cycle can
be used for
Fanuc G76 Threading Cycle
Flexibility
With Fanuc G76 Threading Cycle you can control
- Number of Spring Cuts or Spring Passes on fanuc G76 thread cycle.
- Infeed Angle
- Depth of Normal Cuts
- Depth of Finish Cut
- Depth of First Cut
and many more.
G76 Threading Cycle Example
Fanuc G76 Threading Cycle
Explanation
N5 G76
P010060 Q100 R0.05
N6 G76 X30
Z-20 P1024 Q200 F2
First block of the G76
Threading cycle
G76 : G code for threading cycle.
P : P actually consists of
multiple values which control the thread behavior,
- 01 : Number of spring passes or spring cuts.
- 00 : Thread run out at 45 degree
- 60 : Flank angle or In feed angle
Q : Depth of normal cut ( these
values are given in hundreds, so the depth of cut will be 0.1 ).
R : Depth of Last or Finish cut
R : Depth of Last or Finish cut
Second block of the G76
Threading cycle
G76 : G code of the threading
cycle.
X : The end value in x-axis.
Z : The end value in z-axis.
P : Thread depth ( as radius value ).
Q : Depth of first cut.
F : Thread Pitch
R : Thread Taper
X : The end value in x-axis.
Z : The end value in z-axis.
P : Thread depth ( as radius value ).
Q : Depth of first cut.
F : Thread Pitch
R : Thread Taper
Tapered Threading with Fanuc G76 Threading Cycle
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.
Contents
- Normal Threading with Fanuc G76 Threading Cycle CNC Program
- Tapered Threading with Fanuc G76 Threading Cycle CNC Program
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
|
|
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
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
Controlling Threading Infeed Angle with Fanuc G76 Threading Cycle
Briefly
described how to control thread infeed angle while machining threading on a cnc
machine with fanuc cnc control.
You better
watch the video ( Thread Infeed Tips from Sandvik
Coromant a Video ) which
briefly describes the difference of thread infeed angles and benefits and
weaknesses of different thread infeed angles.
Fanuc G76 threading cycle gives us full flexibility to thread
the way we like.
Contents
Fanuc G76 Threading Cycle
N5 G76 P010060 Q100 R0.05
N6 G76 X30 Z-20 P1024 Q200 F2
Controlling
Thread Infeed Angle with Fanuc Threading Cycle G76
G76 :
Threading Cycle Parameter P P actually consists of multiple values which control the thread behavior,
- 01 : Number of spring cuts, you can change it at your will.
- 00 : Thread run out at 45 degree
- 60 : Thread Infeed Angle / Flank angle
All the
parameters of Fanuc threading cycle G76 are fully explained here. The values with P are actually 03
pairs of values, the last pair is to control the thread infeed angle of each
pass for threading, You can see the bold line above with value 60.
G76 Threading Cycle with 60 Degrees Infeed Angle for
60 Degree Threads (Compound Infeed/ Flank Infeed)
If you put
60 for the infeed angle, this will put most of the load on the front edge of
the threading insert.
G76 Threading Cycle with 55 Degrees Infeed Angle for
60 Degree Threads
If you put
55 for the infeed angle for the standard 60 degree threads, this will put most
of the load on the front edge or leading edge of the threading insert and will
also put a small load on the back edge of the threading insert.
G76 Threading Cycle with 0 Degrees Infeed Angle (
Radial Infeed)
If you put 0
for the infeed angle, this will put the load on the full profile of the
threading insert.
Square
thread always need a straight radial infeed (plunge infeed ).
G76 Threading Cycle Recommended Infeed Angles
The
following indeef angles should be used as infeed angles with G76 fanuc
threading cycle. 80, 60, 55, 30, 29, 00
G76 Thread Cycle a CNC Programming Example
G-code G76 is a cnc cycle which is used for thread cutting on cnc machines.Threading cycle G76 is explained here G76 Thread Cycle.
Taper thread cutting with G76 thread cycle is explained here G76 Tapered Threading
For Multi-start thread cutting with G76 see G76 Multi-Start Threading
For G76 threading cycle one line see G76 One-Line Format.
G76 threading cycle can be used for internal threading on cnc lathe machines.
This G76 threading example actually cuts external threads on two different diameters.
G76 Thread Cycle Example
G76 Thread Cycle a CNC Programming Example
N10 T3
N20 G97 S800 M03
N30 G00 X30 Z5 T0303
N40 G76 P021060 QI00 R100
N50 G76 X18.2 Z-20 P900 Q200 FI.5
N60 G00 X50 Z-20
N70 G76 P021060 Ql00 R100
N80 G76 X38.2 Z-52 P900 Q200 FI .5
N90 G00 X200 Z200
N100 M30
