OK, actually zero tolerance.

Recently I've been getting familiar with the big Jones & Shipman cylindrical grinder at work making some hobbing/turning arbors to a +0 / -5 micron tolerance (obviously aiming for perfect, but we can't get there all the time ), but a few weeks ago it was time to step it up a notch because we needed a 60.000/60.030 mm go/no-go gauge ground after nitriding. Sneaking up on that last micron was one of the most nerve-wracking things I've done, but man it feels good when you get there We have a fancy CNC cylindrical grinder that will hold 1 micron all day, but perfection on a manual machine is just so much more satisfying.

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