You don't need to memorize the manual. You need to know the handful that actually shape how the machine behaves day to day.

A bit-controlled parameter (commonly #5004.2 on many controls) flips whether the WEAR offset column expects a radius value or a full diameter value. Get this backwards on a new-to-you machine and every cutter comp move is off by exactly half of what you expected.

Sets the machine's maximum rapid speed. Shops often dial this down temporarily during break-in on a rebuilt axis or a brand-new machine, then forget to bring it back up — quietly leaving cycle time on the table for months.

Caps how far an operator can push the override dial past 100%. Useful for protecting a marginal setup or an inexperienced operator from overriding their way into a crash.

The software-enforced travel boundaries that stop an axis before it hits the hard mechanical stop. These get revisited any time a fixture, tombstone, or tooling changes the usable envelope of the machine.

None of these require deep expertise to understand. They just require knowing they exist — most machinists go years without ever looking.