"Truing" chuck jaws. Your opinions

So I've been seeing Youtube videos showing people truing chuck jaws with a grinder. They all show that the jaws are bellmouthed by chucking up a pin and showing it wobble, or by showing clearance at the top of the jaws. It's my opinion that this method does not indicate bellmouthing. My thought is that a chuck that shows this indication probably has wear on the jaw raceways, and that the jaws are lifting the same way many mill vices lift. I don't see anybody suggesting grinding the jaws of their mill vise to make them parallel under load. If I suspected bellmouthing of the jaws, I would take them out and put them on my granite plate to check if the face is perpendicular to the raceway. It just seems to me that grinding the jaws without really knowing where the problem lies is a bad approach. Kind of like grinding the ways of a lathe to correct for twist when the lathe hasn't been leveled. What is your opinion?

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文章来自: cnc machining
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