positioning error in BASE

Hi

I wish to ask if anyone can offer any help on a matter that occur with a robot KR240 L180 KRC2 ed 2005 when define a BASE .
I mean, a BASE 1 is defined in the workspace as indicated in the picture (left side one). Sending tool in that zero point tip of tool reach exactly in Base origin as I represented it in the scketch. When BASE 1 is redefined in same point only changing orientation of axis, sending tool in zero tool reach close of origin with error of 10 mm, maybe more on z and y direction.
Robot software is KSS 5.2.19.
First , mastering was checked and robot has been remastered for sure. Positiononig error still maintain even after this new remastering.
Machine.dat was checked and is all right.
Robcor.dat could have a role in this matter?
What else could generate such an error?

Thank you.

Hello

Yes , tool TCP is well defined, there is also posibility to introduce TCP values as numeric input knowing the length of tool. It's coming from a simulation program where it is represented on scale 1:1.

exaclty, it has an offset of 10 mm
we test that on a box piece in corner

We did that procedure, TCP doesn't remain stationary in same point origin when rotating tool around X (C).
At 90 deg deviation is more than 10 mm .
What means that? Is related to TCP? How can be corected this error?
Ty

What you mean wrong tool data ? Wrong TCP coordinates?
What is the maximum accepted deviation?
I did same proedure on another Kuka robot KR210 L150 KRC2 ed 2005 and deviation exist but is 2-3 mm only on Y when rotate C around a point.

I checked machine.dat file and distances between axis, axis rotation limits are as robot Kuka diagram indicate for this robot type.