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4th October 2021, 09:50 PM #1Most Valued Member
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How to keep concentricity when working on both ends of a round bar
I have spent the whole afternoon making a die holder for the lathe. First the round bar was clamped in a 3 jaw chuck. I worked on one end and then flip around and do the other end. However, I can tell both side don't seem to be concentric. It's off by a few mm. Should I do one end. The other end needs to be clamped by a 4 jaw and dial in to keep concentricity?
One more question, the biggest drill size is 13mm from my drill set. However, 13mm hole could not fit in drilling bar, can I still use the bore to drill out a bigger hole. A large size drill bit costs a lot money, I am not sure whether it is very needed. If it is needed, 16mm drill size is the minimum in order to fit the boring bar.
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