I had this barrel left over from my Ruger 10/22 so I cut it down to 6.75 inches and put a quick crown back on it. It will be used for testing, if everything works out I would like to use a heavy barrel for the finished project.
This first image is the Barrel setup in the Lathe ready to be threaded. I used a 4 jaw chuck and the steady rest. The second images is what I ended up with. I had a few problems with the threads because of the extractor slot made the bit jump around, so I had to turn that part of the threads off. I think overall it should still work out. I really do not want to have to chamber a barrel yet so I'm trying to make this one work.
I didn't like how I had to turn the front portion of the threads of so I decided to start over. This time I took a dremal tool with a cut off wheel and ground a angle on the extractor slot so the bit wouldn't jump on the edge again.
Here I'm starting over by turning off the threads from the first try.
In this picture the old threads are all cleaned off and the lathe is setup to rethread the barrel.
After the first pass I checked the threads to make sure I set it up right, it wouldn't be the first time I put the gears on wrong.
Here's the finished product. This time around I spun the chuck by hand and took things slow. With the angle I ground in and spinning the chuck by hand the bit didn't jump around and the threads came out perfect.
This is the start of the barrel bushing. I centered a 1" piece of aluminum in the chuck. I then center drilled it and using several different size drill bits I brought the hole out to .500"
After that I setup the tool head with a boring bar and brought the hole to the final dimension needed. Then I set up with an internal threading bit and proceeded to thread the bushing to match the barrel.
Here is the final result. The first picture shows the internal threads and the second picture is the barrel threaded into the bushing.
Here is the finished bushing next to the receiver tube and barrel. To be continued on the Receiver Page.......