Barrel Re-crown

Viper22

NES Member
Rating - 100%
16   0   0
Joined
Mar 9, 2008
Messages
2,115
Likes
451
Last year I picked up a South Bend lathe from a fellow NESer. It took a while to get the electrical done and acquire tooling. Now that its been running and I put in some time with the machine, I decided it was time to re-crown a .22 rifle that had some rust issues on the end of the barrel & in the bore. Rough cut with a hacksaw from 24" to 18", then squared up on the lathe. The barrel retains the dovetail for the magazine tube mount. I finished it as an 11° target crown. I touched it up with some cold blue after. I can't wait to hit the range to check accuracy with the new crown.


The lathe: 1947 South Bend 9A - shown before belts were put on





With belts on: The elec. motor drives the blue belt, which drives the flat leather belt. The step pulleys are to change RPM.





Facing the barrel:





11° crown:





Finished product: before cold blue

 

mac1911

NES Member
Rating - 100%
72   0   0
Joined
Dec 26, 2008
Messages
31,450
Likes
9,593
Awesome, love new life into the old stuff....I have been using the hand tool with very good results .
That barrel looks pretty thick for a old 22 is it a target model or just the picture angle?.
Looks awesome. I want a lathe/mill I just do not have the space and have not come across one cheap enough yet.
 

Viper22

NES Member
Rating - 100%
16   0   0
Joined
Mar 9, 2008
Messages
2,115
Likes
451
Mac - Barrel is from a microgroove Marlin 60. They are a heavier barrel for a .22, but do have a slight taper.

Fixxah - I would love to have a bridgeport, but the ceiling height in my basement is too low. As long as I stay at my current house I'll have to settle with a drill press & X Y stage OR if I can find one, a baby bridgeport. I looked into benchtop mills, but they go for more than a good bridgeport!!!
 

mac1911

NES Member
Rating - 100%
72   0   0
Joined
Dec 26, 2008
Messages
31,450
Likes
9,593
Mac - Barrel is from a microgroove Marlin 60. They are a heavier barrel for a .22, but do have a slight taper.

Fixxah - I would love to have a bridgeport, but the ceiling height in my basement is too low. As long as I stay at my current house I'll have to settle with a drill press & X Y stage OR if I can find one, a baby bridgeport. I looked into benchtop mills, but they go for more than a good bridgeport!!!

This,or my electrical in my house is under powered!
 
Rating - 100%
2   0   0
Joined
Jun 18, 2012
Messages
234
Likes
138
Location
Metro West
Hey, I have one of those. Is that a 10"? Mine is a 9".

I'm seriously considering buying a Green Mountain chambered AR barrel and profiling it myself.

Did you use the compound to get the 11 degrees? Did you finish with a muzzle lap?
 

Viper22

NES Member
Rating - 100%
16   0   0
Joined
Mar 9, 2008
Messages
2,115
Likes
451
This,or my electrical in my house is under powered!

That too. The baby bridgeport runs on 110, which is why I'd love to get one.



Hey, I have one of those. Is that a 10"? Mine is a 9".

I'm seriously considering buying a Green Mountain chambered AR barrel and profiling it myself.

Did you use the compound to get the 11 degrees? Did you finish with a muzzle lap?

My machine is a 9" I did use the compound for the 11° cut. I'm running the old style lantern tool post, so I was only using 1/4" tooling. Harbor Freight carbide LH bit that I ground myself. I went back in and put a 0.015 x 45° chamfer from the bore to the crown. Cut from the bore out to not push burrs into the rifling. I used red & grey scotchbrite to do a quick polish before bluing.
 

Viper22

NES Member
Rating - 100%
16   0   0
Joined
Mar 9, 2008
Messages
2,115
Likes
451
So here is the finished product. Since I shortened the barrel to 18" I also had to shorten the mag tube. I had to chuck the knurled knob in the lathe and face that. Had to remove about 0.250-0.275" to get the knob flush with the barrel.






 

Fixxah

NES Member
Rating - 100%
41   0   0
Joined
May 1, 2008
Messages
30,689
Likes
10,579
Location
Outskirts of Tiot.
Mac - Barrel is from a microgroove Marlin 60. They are a heavier barrel for a .22, but do have a slight taper.

Fixxah - I would love to have a bridgeport, but the ceiling height in my basement is too low. As long as I stay at my current house I'll have to settle with a drill press & X Y stage OR if I can find one, a baby bridgeport. I looked into benchtop mills, but they go for more than a good bridgeport!!!

1776 has a bridgeport for sale. $850
 

mac1911

NES Member
Rating - 100%
72   0   0
Joined
Dec 26, 2008
Messages
31,450
Likes
9,593
So here is the finished product. Since I shortened the barrel to 18" I also had to shorten the mag tube. I had to chuck the knurled knob in the lathe and face that. Had to remove about 0.250-0.275" to get the knob flush with the barrel.






that looks cool flush like that.
 
Top Bottom