PCV 60 OKK, over travel when running program with G41 code. please help.

Dear all,

I run a short program: drill a 0.5" hole, and the next tool is #4 ( 0.250" EM Finish 5 flutes ) to open that hole to 0.515" with G41 code in program.

The first tool (Drill) is OK


The rest of program ( Tool 04 ) as followed:

%
O0001
G0 G91 G28 Z0.0
M98 P7 (RESET WORK OFFSETS)
M01
(---)
G40 G17 G49 G98 G80 G90 (SAFE START)
M98 P8 (PREPARE FOR TOOL CHANGE)
T004
M06
M08
G4 P1000
G90 G56 X0.0 Y3.5
G43 Z4.51 S4074 H004 M03
G1 Z4.11 F19.008
G41 X.0635 F17.28 D4
X.0628 Y3.5097 Z4.1075 F19.2
X.0606 Y3.5193 Z4.105
X.057 Y3.5283 Z4.1025
X.0519 Y3.5367 Z4.1
X.0457 Y3.5442 Z4.0975
X.0384 Y3.5507 Z4.095
X.0302 Y3.556 Z4.0925
X.0213 Y3.5599 Z4.09
……….
……….

G1 X.25 Y-3.491
G40 Z4.51 F192.
M09
G0 G91 G28 Z0.0
M05 M01
M30
%

The problem is : Program run to X.057 Y3.5283 Z4.1025 and begin go in linear direction and causes alarm 510: "Over travel +X"
My friend show me to adjust D4 to D6 on the line of G41 code. ( He show me but either does not know why :confused:)
and now it runs on the helical direction, deeper and open the 0.5" hole to app. 0.515", OK

Can some body show me how to view the Dia. / Rad. offset as I use to see in NV5000, I try to enter Offset page but just see Tool Length Offset and Work Offset only.

It also happens with another program on tool #14 ( <>0.325 EM ) with G41 X... Y ... D14. Thus, I have to adjust to D6 to get the desired result. ( <>0.515" hole ) ....

Actually, I want to know why s/t it run on linear direction, s/t it runs in correctly helical movement although D xx different from T xx . I do not want reckless, as carelessly as above.

Attachment 247664
Attachment 247666

Thank you for your advice.