Siemens alarm 14040: Channel %1 block %2 error in end point of circle

What it means

For a circle programmed via center offsets (I/J/K) or signed radius (CR=), the specified end point does not lie on any geometrically valid circle within tolerance. Start, end and center data are mutually inconsistent, commonly due to rounding or sign errors. Recheck coordinates, the CR sign convention and circle tolerance settings.

Likely causes

• End point coordinates mistyped or rounded inconsistently
• Wrong sign of CR= selecting the impossible arc variant
• Circle tolerance set tighter than CAM output precision