another chamber question

D

dcb

Guest
what are the correct steps to chamber a barrel.
Do you cut the chamber then the tennon and threads?
or cut the tennon and threads then the chamber?
thanks Dave
 
Being new to this I decided to chamber first using the drill then taper bore method, through the headstock. I like to chamber deep stopping with a good finish then face, do the mouth radius and polish up. If all is perfect with the finish then I'll thread and headspace. My reason is lack of chambering experience so I'm much more confident in cutting the shoulder and facing than stopping the reamer where I should with a good finish. Most guys here don't have that problem.

Cheers,
Rob
 
dcb

dcb said:
what are the correct steps to chamber a barrel.
Do you cut the chamber then the tennon and threads?
or cut the tennon and threads then the chamber?
thanks Dave
Click to expand...
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The turning of the tennon and cutting the thread is far riskier to dislodge the barrel set up by hitting the shoulder accidently, than the drilling and cutting the chamber is. As accidents do happen it's better to get the risky(tennon/thread) part out of the way first and do the light work on the chamber last.

Shoot well
Peter
 
I would be concerned that if you chamber first, and then remove all that metal around the chamber, that the chamber will grow some.......

Also, I like to set headspace with the action and bolt threaded onto the barrel. Can't do this until the threads are cut.
 
Hi Butch,

I understand. But I didn't see him asking about a Glue In...........But even if you are headspacing from measurements, the issue of the chamber expanding still exists, correct?
 
Roy

I believe that is a non issue as well. If removing around .140 inch diameter from a typical 1.200 Sporter Shank causes the bore to change any measurable amount, I would like to see how you are measuring it.
I rough the tenon out to within .005, then establish as good of a chamber as I can in the barrel. I then perform all of the other machining operations.
The reason I rough the tenon out is that is the only time that there is any appreciable tool pressure to possibly disturb the set-up.
Incidentally, after I establish the chamber, I check it and the throat area with the .0001 indicator to insure that it is as it should be..........jackie
 
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