I got a call a while back from a machine builder who was convinced his linear guides had the wrong preload. The carriages had felt smooth when they arrived, but after he bolted the rails to the base, one of them felt noticeably tighter.
He wanted to return the guides.
That wasn't the first time I'd seen this. And in most cases, the preload wasn't the real problem.
But preload does matter. It just matters differently from how a lot of people think.
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