Originally Posted by Loner
I have seen quite a few smiths that talk in the ten thousandths not thousands when it
comes to barrels. As do most of the barrel manufacturers.
Barrel making and chambering are two different things. You can make do with a .001 grad indicator, just make sure when ya' call it good, that the needle doesn't move barely at all. Most manual lathes used for chambering are going to have .001 to .0005" of spindle play. If you tighten the bearings more than that don't turn very fast for very long as you must take into account the heat expansion that will result ( I use my lathe for much
more than just chambering. Many tools are made there, too). It's all in the set-up. Warm your lathe up before putting a barrel in to dial it in. As long as the indicator is quality made, Starrett, Federal, ect., ect., take your time dialing in so there is no movement of the pointer, you'll be OK. I read lots about working to 4 and 5 places to the right of the decimal point. I've worked in the machining business since '74, few manual machines are capable (accept tool and cutter grinders) even fewer operators are. Manual lathes that are capable are usually far out of reach, dollar wize, for most.