Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 557)

Grooving/Cutoff Cycles
Chapter 23
23-3
Figure 23.2
Tool Path during a G77 O.D. Grooving Cycle
Z
Tool path, cutting feedrate
Tool path, rapid feedrate
No motion, for drawing clarification
X
Z
X
K
X X
I+e
I+e I+e I+e
I+e I+e
I+e I+e I+e
I I I
D D D
e
e
e
e
e
e
e
e
e
e
ee
e
These cycles may also be used as cut off cycles. The tool infeeds into a piece
of stock, as in grooving, except that it cuts all the way through the part. Then,
instead of retracting the cutting tool straight out of the part, the tool is shifted
a predetermined direction and amount before retracting. This shifting helps
attain a good finish on the end of the part that has been cut.
The G76 Face Grooving grooving cycle is typically used to cut multiple
grooves in a workpiece or as a cut off cycle. When the cycle is executed
the groove or cutoff is made by infeeding the tool into the workpiece in
steps to allow the removal of chips. The initial groove width (or width of
material removed during the infeed) is determined by the tool dimensions.
The first groove is cut from the X coordinate position of the tool prior to
the execution of the G76 block.
23.1
Face Grooving Cycle (G76)