Re: Truing or squaring an action
Not hammering on your smith but that is not the correct way to truely blueprint a receiver. Only way to do it correctly is to dial in the receiver along the bolt way axial center at two different points using precision fit bushing and a precision ground mandrel. This removes any conical variation in the receiver as it spins in the lathe.
The threads then must be recut, single point recut, to the same axial alignment as the receivers bolt way to insure that the barrel axial alignment is perfectly aligned with the receiver.
Then the bolt locking lug recesses are cut perfectly square to this axial alignment as well. And finally the receiver is also cut perfectly square.
As for the bolt, its basically the same process with the dialing in of the bolt and cutting the bolt lug contacts and using some bolt fixtures the bolt nose and face as well.
If you go off the receiver threads as you are discribing, it is nearly impossible to get a receiver perfectly true. Some of the relating baring surfaces may be square but others will not be using the factory threads as a starting point to the accurizing process.
What you have discribed is not the best way to correctly accurize a receiver, in fact it is a poor method of doing this in my opinion. I know this because when I started I used the same method and now use the Gre Tan method of accurizing and the two do not compare.
With smaller calibers the system you mentioned can at times produce very good shooting rifles, as the size of the chamberings increase you will see more and more problems with accuracy using this system. This is what led me to look for a better way and the Gre Tan accurizing method is the best I have seen out there being used today.
Again, not a hammer to your smith but he should look into buying the tooling and fixtures to accurize receivers correctly, he will not be sorry for the upgrade, neither will his customers.
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