setting work offset(G54 etc)

[dek]

i am using a binns and berry data 90 lathe with a fagor 8025ts controller.When you go to home search in X and Y the machine goes to zero on the tailstock side of the machine, on other machines i have used it is 800 X 400 or what ever the paticular size of the machine is (because zero is back of chuck) .How do i set the workshift(G54) so it is at the front jaws of the chuck as i do not know this distance as the machine has zero,d at the other end of the machine.

[HuFlungDung]

I am not familiar with your controller. However, there may be parameters that you can set which will assign a G53 machine position to the home position. It sounds as though the control is currently just inserting zeros at those positions.

You'd have to determine the actual Z distance to your desired zero point at the chuck and insert that in the proper parameter.

Sometimes you'd have to shut down and restart a controller to make a setting like this stick.

Another less desirable method would be to command a G50 (G92 in mills) position when the turret is at home. This has the effect of shifting the G53 coordinate system and typically drags all the related work offsets along with it. The disadvantage of doing this is that setting does not stick between power down/power up sequences so you'd have to do it manually.