07-28-2016, 07:24 AM
Greg,
Normally when the jaws are worn on a chuck, the scroll is worn as well. Try checking the runout on different diameters of stock and see how much variation you get. Ideally the jaws should be preloaded in the direction of use before grinding them, but as long as the scroll isn't badly worn, it doesn't make much difference. Axial runout is helped the most by grinding, as you have found with your .00025 reading.
Tom
Normally when the jaws are worn on a chuck, the scroll is worn as well. Try checking the runout on different diameters of stock and see how much variation you get. Ideally the jaws should be preloaded in the direction of use before grinding them, but as long as the scroll isn't badly worn, it doesn't make much difference. Axial runout is helped the most by grinding, as you have found with your .00025 reading.
Tom
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