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Lathe G72 Last Roughing Pass Is 0.021 Away From Part

Mr.E

Aluminum
Joined
Mar 11, 2017
Location
Southern
I got a ST-20 using G72 and G70 to face a beveled profile using G41 and Tool Tip #3.
On the last roughing pass on a facing operation the tool in "Z" is 0.0206 away then the finish tool finish does its job.

Its got to be a setting that is doing this.

Just for reference here is the program

G54
G28 U0 W0
T1010 (Rough Face)
G50 S1000
G97 S407 M03
N105 G00 X3.1 Z0.15 M08
N106 G96 S330
N107 G72 P108 Q111 U0.01 W0.005 D0.035 F0.003
N108 G41 G01 X3. Z-0.062
N109 G01 X2.876 Z0.
N110 G01 X0.
N111 G40 G00 Z0.15
N112 G97 S407 M09
N113 G28 U0 W0
N114 T909 (FINISH FACE)
N115 G50 S1200
N116 G97 S493 M03
N117 G00 X3.1 Z0.1 M08
N118 G96 S400
N119 G70 P108 Q111 F0.003
G00 Z0.15
G97 S493
G28 U0 W0 M09
M30

Thanks,
Any help would be appreciated.
 
There is a possibility my tool tip should be #2, not #3.
I will check on that Monday.
If someone can confirm that would be great.
 
Not sure about Haas but if i was programming a G72 on a Fanuc i would do that like:
N108 G0 Z-0.062
N109 G01 x3.
N110 X2.876 Z0.
N111 X0.

Turn G41 on for the finishing pass only.
 
I found the problem.
It is tool tip #3, not #2.
When I double checked the setting it said #0, my bad.
Changed it to #3 and all was perfect.
 








 
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