The Z-axis thought it was at +12.000 mm. The dial indicator said -0.400.
The servo groaned. The axis lurched. Then: heidenhain error codes
The TNC 640 screen flickered — not the warm hum of a healthy contour, but a cold, amber glow. The Z-axis thought it was at +12
“The axis tried to move where the glass didn’t see.” but a cold
He pressed CYCLE START anyway.