Touch Offs & why values won't....

[Girl]

I am puzzled about my Touch off values. I can touch off (input) that value and save it . Then maybe a week month whatever goes by and I am going to run that same job, so I input the value that I used the last time (for this same job) and it will be off a great deal. What's up??

[Torchhead]

What kind of CNC plasma or EDM do you have? We have a touch-off system for plasma but it uses a mechanical switch (not ohmic) and a programmed offset value.

[Girl]

I don't think it is edm not sure about the plasma. It is a cincinnati milacron 4 axis lathe. Mostly turning ops, boring and groving. Is your touch off system a probe type? My bottom turret is not hard wired for that, but the top turret is.