Buried in subsection 12.4.3 was a paragraph no one quoted: “The R-2000iA/165F’s J4 axis (wrist rotation) utilizes a dual-harmonic drive with preloaded cross-roller bearing. Due to the 165kg rating, the drive will develop micro-slack after 25,000 hours of operation. Fanuc recommends ‘predictive backlash mapping’—a process requiring manual rotation of the wrist under 40% counter-torque and measurement with a dial indicator accurate to 0.01mm.” He looked at Unit 7’s service log. Operating hours: 27,400. The wrist had never been mapped.
He ran a dry cycle. The arm traced a perfect arc. Wrist rotation: accurate to 0.03mm. fanuc robot r-2000ia 165f manual
It wasn't a PDF. It wasn't a wiki. It was a brick of bound paper, heavy as a cinder block, smelling of stale coffee and ozone. The cover read: . Buried in subsection 12