Rockwell Automation 8520 9/Series CNC Lathe User Manual
Page 574
Compounding Turning Routines
Chapter 24
24-10
Figure 24.7
Tool Retraction in Case 1 G73
R
R
X
Z
45
°
45
°
4.
Rapid traverse back along the X and Z axes to the coordinate that the
last rough cut started from in step 2.
5.
Move parallel to the X axis, at a feedrate F, a distance D as
programmed in the G73 block.
Steps 2 - 5 continue to repeat until the operation is aborted or the rough
contour shape is completed. The rough contour shape is completed when
the thickness of the remaining material to be removed from the workpiece
is equal to the sum of the finishing allowance (U+W)/2 and the final pass
allowance (I+K)/2. If no final pass is to be cut (no I or K in the G73
block), skip to step 7.
6.
The final pass is made at the feedrate programmed in your contour
block including rapid (if the contour does not contain a programmed
feedrate, then it uses the F-word in the G73 block). Only the amount
of material specified with the final pass allowance (I+K)/2 is cut.
This cut is made parallel to the exact contour of the final workpiece,
it is not a roughing pass. After this cut is complete, the only
remaining material on the workpiece contour is the finish amount (if
any) programmed with U and W.
7.
The control returns the cutting tool, at a rapid feedrate, to the start
point of the cycle.