I have been working on a project for a customer that requires holding a forged piece in a 2-jaw chuck system for turning and/or milling in a lathe or mill/turn machining center. I do not have a lot of experience with long term wear and failure modes of 2 jaw chucks. Can someone help me understand the the life, failure modes, and anything else that can affect machined component quality in the different types of chucks?

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Usually a 2 Jaw chuck started life as a 3 Jaw chuck 8-) Why are you using a 2 jaw chuck? Depending on tolerances there may be better ways to hold the work piece.
I am not sure what you mean by a 2 jaw chuck started life as a 3 jaw? The advantage of a two jaw over a three jaw is that the customer can take advantage of the live tools in the turrets and machine on the side as well. (Think fluid fittings like elbows and tees.) Using the mill/turn capabilities of the machine they can load the part once and have it come out complete.

Bill MacCracken said:
Usually a 2 Jaw chuck started life as a 3 Jaw chuck 8-) Why are you using a 2 jaw chuck? Depending on tolerances there may be better ways to hold the work piece.
Craig,
I understand the application but depending on how much steel is removed from the forging you may have several dimensional issues. Is there a stress releive operation after turning and milling? If there is then any side holes or features put in will not be accurate if there are true position call outs unless they are huge. Also watch out for the flatness of the faces and any parallelism.

Paul
Craig,

There are different types of lathe chucks and life and failure modes will be affected by your cuttin conditions. There are ball lock chucks, pin arbor chucks, wedge chucks. What type of chuck are you looking into?
We are looking into wedge chucks.  I have always been a fan of the least moving parts and the maximum surface contact area for durability.

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