AFAIK there is no data that pertains to home accuracy, how much is it shifting by, I am assuming the servo's/encoders DMR/CMR are set according to the machine Ball screws etc.
But this would not cause a difference every time you home, it would be consistent.
The only thing I can think of is home limit switch integrity, i.e. sticking etc, but both switches?
Or the encoder zero pulse too close to the grid division.
How much does it vary by and is it always by the same amount and direction.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.