Fanuc 18i Lathe parameter question

[Stifler51]

At work we just got a new Hyundai Kia skt250ms lathe with an 18i tb control on it. All our other lathes are Haas atm so its kinda been a learning curve on a new control, but so far so good.

The question i have is everytime i start up the machine and i hit job and zero return to home out the machine or hit reset it loses it relative location. It will count down to zero with the machine home but once there it resets to -16 inches. So every time i start a program i need to make sure i have a G28 U0, T0100, G50 X0. to cancel and clear it out. If i dont it just alarms out because it thinks its below the part already and trys to go positive in the X.

Anyone know what parameter might change that? or is it something else?

[txcncman]

Add a sample of your program here, without using G50, to be reviewed.

[Stifler51]

Even if i do something completely basic like

O0001 (Simple OD Turn)
G50 S3000;
T0707;
G97 S2000 M03;
G00 G54 X2.1 Z.1 M08;
Z0;
G01 X-.03 F.007;
G00 Z.1;
X2.1;
G71 U500 R500;
G71 P1 Q2 U.01 W.003 F.01;
N1 G00 X1. F.005;
G01 Z-1.;
N2 X2.1;
G70 P1 Q2;
G40 M09
G00 G53 X0 Z-10.;
M30;

If im in editing my program scrolling around and then hit reset -> memory -> prog -> go. The control will reset the relative cords and the program will take off and try to go positive cuz it thinks its below the part then alarm out saying X overtravel. It also does it when i first start up the machine and hit jog -> zero return. You can watch the relative count down exactly with the machine cords but when it gets to zero relative resets itself to -16.something inches.

The only way around it is if i add at the beginning,

O0001 (Simple OD Turn)
G00 G28 U0.;
T0700;
G50 X0;
;
G50 S3000;
...

Pretty much i cant hit reset in edit or home the machine or ill lose my relative cords.

[underthetire]

Wow, it really sounds like its in the old manual incremental mode. I havnt seen it on the newer controls, is there a switch by chance on the panel that says something like abs/inc? If not it may be in a parameter.

[Stifler51]

i dont recall seeing a switch, i assumed it was a parameter.

I found a copy of the parameters book HERE but cant find anything related so far.

[fordav11]

I would write that program slightly differently.
Try this....

O0001 (Simple OD Turn)
G54
G50 S3000;
G0 T0707;
G97 S2000 M03;
G00 X2.1 Z.1 M08;
Z0;
G01 X-.03 F.007;
G00 Z.1;
X2.1;
G71 U500 R500;
G71 P1 Q2 U.01 W.003 F.01;
N1 G00 X1. F.005;
G01 Z-1.;
N2 X2.1;
G70 P1 Q2;
G0 X12.0 Z12.0 M9; (or some other safe index position away from the part)
T0700 M5;
M1;
G00 G53 X0 Z0; (or use G28 U0 W0 but this entire line is not really required)
M30;


If that doesn't work....
This could be caused by the way you have set up the workshift and tools.
Take a photo of your workshift page and one of your tool geometry page.
I fixed a similar issue with someone (by visiting his shop in person) and it was relating to the way he set the workshift and geometry.