Rockwell Automation 8520 9/Series CNC Lathe User Manual

Page 574

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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.

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