Quote Originally Posted by Washout View Post
The order has given me some more concrete requirements and a question that needs answering - when someone is quoting a 4 or 6" chuck are they referring to the size of the chuck or the diameter of the workpiece it will hold? Reason I ask is I have a need to turn down some 88.9mm (3.5") rounds to around 70mm dia. with an 85mm dia. flange, so the chuck will need to hold those.
They're referring to the external diameter of the chuck. Google and you'll find the range of sizes a particular chuck size holds. You'd hold that size with a 6" chuck using external jaws. 8" would be nice if the lathe is big enough to support it.