just like I didn't realize I was reducing the diameter of my workpiece by twice as much as the amount on the crossfeed dia
Not all lathes do this. some lathes when you take a .010 cut that is what is removed not .020 The cross feed threads account for this. and and as I said not all lathes do this. I test any new lathe with a dial indicator to see what is being removed....but now you know.