Just realized my rail alignment was off after a customer pointed it out

Had a guy at the 3rd floor watch me level a rail for a new Otis install. He said "the bubble's centered but look at the gap on the left side of the car." I ignored him at first. Then I measured with a caliper and he was right by a full 3mm. Took me 20 minutes to shim it properly after that. He was a retired mechanic from the 80s, knew his stuff. Now I check both the bubble and the visual clearance before I commit to anything on the rail. Anyone else get humbled by an old timer on site?

2 comments

2 Comments

perez.thea3d ago

Read a study once about how experienced mechanics develop an eye for clearance gaps that beats any tool. The old timer had that. He probably spent decades watching elevators sit level before the final shim. The bubble will lie to you if your rail isn't straight. That 3mm he caught was a real thing. It's funny how a retired guy with no stakes in the job can spot what you miss.

seth_allen3d ago

Did that old timer ever mention how many years it took before his eye started matching the dial indicators?