If you’ve ever watched a wafer inspection system slowly lose its edge after a few thousand cycles, you know the linear stage isn’t just a commodity part. I learned this firsthand when a die bonder we were qualifying started showing placement drift in the final 10% of each shift. The root cause wasn’t the vision system or the controller tuning – it was the stage’s inability to maintain repeatability under continuous start-stop loads. That experience shaped how I look at motion components today. In semiconductor equipment, you typically can’t fix a mediocre stage with clever software. The mechanical backbone either holds up or it doesn’t. Here’s what I’ve found using PSG precision linear stages across several machines, from wafer AOI stations to laser scribing tools.