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Fundamentals of Axial drilling G74 cycle

Fundamentals of G74 peck drilling cycle

Here is a cnc programming example for simple drilling on a cnc lathe machine. CNC Fanuc control has a very powerful and versatile peck drilling cycle (Fanuc G74) which relieves us from many unwanted chores. Although Fanuc G74 peck drilling cycle for fanuc cnc control can be used in variety of ways but this cnc programming example is just doing a simple peck drilling. One thing for newbies in cnc field is that we can simply drill a component by just giving a feed with G01.

G00 X0.0Z1.0
G01Z-10.0

G74 cycle does a peck drilling operation to drill a hole along the axis. The cyce can actually be used to drill multiple axial holes at various positions on the radius on a machine with a C-axis and live tools. The explanation here is restricted to drilling a single axial hole.


If we can drill with the above method them why use a peck drilling cycle. Actually peck drilling (Fanuc G74) gives us some hidden benefits like

  • Longer drill life
  • Proper chip breaking
  • Proper chip removal
  • Prevents component from heating
  • Smooth drilling
  • Easy to program
So here is the simple cnc program example which shows simple cnc peck drilling (Fanuc G74) on a cnc lathe machine


Structure of G74 cycle

G74 R

G74  Z  Q  F


R = Retract amount at each peck.
Z = Z coordinate of hole bottom.
Q= Peck depth, in microns.
F = Feed rate

Note:- To drill the hole in a single pass (without pecking), set Q equal to the depth of the hole.

Example




____
G00 X0.0 Z2.0;
G74 R0.5
G74 Z-55.0 Q2000(IN MICRONS) F0.15
G00 Z10.0.               (only while drilling in several cuts)
G00 X50.0
____





____
G00 X0.0 Z2.0;
G74 R0.5
G74 Z-55.0 Q55000(IN MICRONS) F0.15
G00 Z10.0.               (only while drilling in single cut)
G00 X50.0
____

Observe the Q value for the difference

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