X, Y zeros not always the same?

[ClayM325]

Ive just started messing with some 3d stuff, and a couple times when I change bits on a project, and rezero x and y, they might be off a tiny bit from the previous cut (in which it was also zerod) which totally ruins the material in most case cause things aren't lined up correctly. Any way to fix this?

[coryatjohn]

A couple of questions.

1. What model CNC do you own including the year?

2. How are you zeroing?

[ClayM325]

A couple of questions.

1. What model CNC do you own including the year?

2. How are you zeroing?


Model is a 2015 PRS Standard and I am zeroing using prox switches

[coryatjohn]

I don't trust the prox switches.

Do you reset the X-Y coordinates during a job? If so, why do you find that necessary?

I have a PRS Alpha so maybe what you're doing is SOP. I find the coordinate system never drifts or need adjusting.

[jerry_stanek]

I have a PRS standard and it will zero perfectly ever time. My old PR would also be spot on. Are your trigger bolts close enough

[ClayM325]

I sometimes need to do it between bit changes, if I feel I may have moved the spindle a little one way while loosening or tightening the collet

[ClayM325]

I don't trust the prox switches.

Do you reset the X-Y coordinates during a job? If so, why do you find that necessary?

I have a PRS Alpha so maybe what you're doing is SOP. I find the coordinate system never drifts or need adjusting.

Is there another way to zero, other than Prox switches?

[Gary Campbell]

Clay...
I'm with Jerry on this one. IF you prox switches are installed properly they should return repeatability within a couple thousandths. They are the ONE thing that gives you the ability to position within a couple thousandths time after time.

Usually when returning inconsistent results the distance between the switch body and target bolt is to great. Look in the manual and adjust as needed.