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I have been watching a few of the YouTube machinists and it seems that the 4 jaw chuck is becoming all the rage. Now, I understand the need for one when offsetting or working with square stock, however, if your 3 jaw is accurate, what's the advantage of the 4 jaw on round stock. I just tested my 3 jaw with a. 750" gage pin and it shows less than a thou TIR. I chucked up a piece of 1" round bar and took one. 050" cut and then a .010" cut and checked the runout and still less than .001" . To be honest I doubt that if I had indicated it in the 4 jaw I would get much better results. This is just one of those "hmmmm" thoughts and questions and just wanted to get you guys take on it. Cletus
Quote from: Tennessee Whiskey on November 06, 2016, 07:38:25 PMI have been watching a few of the YouTube machinists and it seems that the 4 jaw chuck is becoming all the rage. Now, I understand the need for one when offsetting or working with square stock, however, if your 3 jaw is accurate, what's the advantage of the 4 jaw on round stock. I just tested my 3 jaw with a. 750" gage pin and it shows less than a thou TIR. I chucked up a piece of 1" round bar and took one. 050" cut and then a .010" cut and checked the runout and still less than .001" . To be honest I doubt that if I had indicated it in the 4 jaw I would get much better results. This is just one of those "hmmmm" thoughts and questions and just wanted to get you guys take on it. CletusYou are very fortunate to have a three jaw that will center that well over a range of diameters. If you really want to check it do about 6 different diameters over the range of the chuck. If they all come in that close, then set that chuck aside in a special, protected place, and use it only for those jobs where you need that accuracy. Then go buy another chuck for normal work...Pete
I chucked up a piece of 1" round bar and took one. 050" cut and then a .010" cut and checked the runout and still less than .001"