Rockwell Automation 8520 9/Series CNC Lathe User Manual
Page 573
Compound Turning Routines
Chapter 24
24-9
G73 Tool Paths, Case 1
When the control executes a Case 1 G73 contouring path, these tool paths
are generated:
Figure 24.6
Tool Paths for Case 1 G73 Roughing Routine
Cutting feed
Rapid feed
X
Z
R
R
R
D
D
D
Shape defined by workpiece
contour blocks
Final pass
(Optional)
(I+K)/2
(U+W)/2
(start
point)
In Figure 24.6:
1.
The tool is moved from the start point parallel to the X axis, at a
feedrate F, a distance D as programmed in the G73 block.
2.
A rough cut is made parallel to the Z axis, at a feedrate F to a point
that intersects the workpiece contour path, minus the finishing
allowance and final pass allowance (if any).
3.
Retract from this point at a 45 degree angle, at a feedrate F, a distance
R measured parallel to the X axis. The R value may be entered as a
parameter in the G73 block. If no value for R is programmed then
the control uses the value for the retract amount set in AMP by the
system installer.