PSA: Those modern 'self-leveling' systems aren't always better than the old shim method

I was working on a Miconic 10 controller retrofit in a building from 1989 last week, and the tech insisted on using a laser leveling kit over the old worm gear shim approach. Took us 3 hours to get the car within spec, and it still drifted 2mm after a full load test. My mentor back in '05 would have had it dialed in with shims in 45 minutes, no joke. The new stuff has its place, but sometimes the old manual way gives you more control, especially on older rails that have settled. Has anyone else run into this where the fancy gear just complicates things?

3 comments

3 Comments

julia_anderson2d ago

Wait, isn't the Miconic 10 from the early 90s? I thought they stopped making those in 1991 or something, but you said 1989, so that checks out. Actually, the worm gear shim method you mentioned is way more forgiving on older rails that have settled over time (like you said, 30+ years of wear changes everything). The laser kit is great for new installs where everything is still straight, but on old steel that's sagged a bit, those fancy sensors just fight against the real-world geometry. Maybe the tech's laser wasn't calibrated right, or the building's foundation shifted since 1989, which happens more than people think.

taylorc402d ago

Julia, I gotta push back a little on that. @julia_anderson the worm gear shim trick might work ok on old gear, but it's a bandaid that masks real rail issues. 1989 was 35 years ago, but if the rails were installed right and the structure hasn't moved, they should still be straight enough for a laser alignment. That tech probably just didn't prep the rails right or had a bad calibration before they started. A good laser setup can account for settled buildings and worn joints way better than guesswork with shims ever could. You get repeatable results with a laser, not just hoping the shim holds for another decade.

grace_campbell1d ago

Took a call last month where the customer swore their brand new Otis system was losing level by 4mm every few cycles. Turned out the building's parking garage next door had been dug out for a new foundation, and the whole ground shifted like 8mm over three weeks. Laser couldn't account for that, but shims bought us time until the real settling stopped. Sometimes the simple stuff just works when the ground is still moving under your feet.