Saturday I chambered and fitted another barrel for my 6.5 1000 yard light gun and all went wonderful until I went to cut the threads on the chamber end. I do my chambering between centers and use a Gre-Tan flush system. My normal procedure is to turn down the tenon but leaving it oversized by .050 then ream the chamber and then I put the live center back in the chamber to finish turning down the tenon and cut the threads.
The blank was 32 inches so it was using up a fair amount of the 48 inch bed. When I turned the tenon down things were good. Then I started to cut threads and noticed some chatter. I made sure everthing was tight and solid and proceded. The threads continued to chatter and when I was done the job was totally unacceptable so I cut off the tenon, rechambered and started over. The second time I double checked rigidity and even set the steady up past the mid point on the barrel not tight but just providing enough contact to prevent flex when I ran the live center into the chamber end. This time things were alot better but there still is some evidence of chatter in the threads. I am using a CARMEX tool and insert. I had no evidence of chatter when turning down the tenon just in the threading operation.
I chucked the barrel in the 4 jaw to do the muzzle brake work and did all of the threading and fitting with no chatter. Things were great.
Any ideas? All thoughts appreciated.
Daryl Kopriva
The blank was 32 inches so it was using up a fair amount of the 48 inch bed. When I turned the tenon down things were good. Then I started to cut threads and noticed some chatter. I made sure everthing was tight and solid and proceded. The threads continued to chatter and when I was done the job was totally unacceptable so I cut off the tenon, rechambered and started over. The second time I double checked rigidity and even set the steady up past the mid point on the barrel not tight but just providing enough contact to prevent flex when I ran the live center into the chamber end. This time things were alot better but there still is some evidence of chatter in the threads. I am using a CARMEX tool and insert. I had no evidence of chatter when turning down the tenon just in the threading operation.
I chucked the barrel in the 4 jaw to do the muzzle brake work and did all of the threading and fitting with no chatter. Things were great.
Any ideas? All thoughts appreciated.
Daryl Kopriva