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iraiam · September 28, 2013, 08:31 PM

I was wondering what the average tolerance is when dialing in on the bore of a barrel for cutting crowns and other work on a lathe.

I have been using 10um (.00039") as a tolerance to stay inside of, this is about as accurate as I can get on my equipment, I tried 7um (.00027") once but I spent quite a bit of time setting it up, I think I can build a better barrel holder and get is dialed in there.

I'm using micrometers because that is the most accurate dial indicator that I have, I have one that the resolution is .0005", but I find it easier to use the finer resolution to set up because the gauge moves more.

September 28, 2013, 08:31 PM	#1
iraiam Senior Member Join Date: September 6, 2012 Location: Lakewood, CO Posts: 1,057	What is your setup tolerance to bore? I was wondering what the average tolerance is when dialing in on the bore of a barrel for cutting crowns and other work on a lathe. I have been using 10um (.00039") as a tolerance to stay inside of, this is about as accurate as I can get on my equipment, I tried 7um (.00027") once but I spent quite a bit of time setting it up, I think I can build a better barrel holder and get is dialed in there. I'm using micrometers because that is the most accurate dial indicator that I have, I have one that the resolution is .0005", but I find it easier to use the finer resolution to set up because the gauge moves more. __________________ NRA Lifetime Member Since 1999 "I ask, sir, what is the militia? It is the whole people except for a few public officials." George Mason