If your looking at the outside of the barrel past the tennon it likely is off center, every barrel Ive ever came across has at least .020 or so runout on the outside diameter when dialed in off the bore or set between centers using the bore.
The outside diameter of a barrel can have quite a bit of run and its pretty normal to see. Barrels are dialed in with the inside diameter of the bore or set up between centers of the bore like in this situation. As long as the bore, the threaded tennon and the chamber are running true the outside of the barrel doesnt really matter
Thanks for posting the video. Only suggestion would be don't hold the barrel in the steady over the threads. Support it in the steady rest just past the threads on the shoulder.
@TheManFromAlaska I put the steady on the threads as the threads are cut concentric to the bore.....The outside of the barrel could be off by .050 (Ive seen). I guess you could true up a section in front of the tenon and put your steady rest there
@jeep4x4greg I once heard that that the old tymers did it by hand...So I asked an od tymer and he told me it would take a week to do one chamber and your hands would be too sore to do it on a regular basis
I have a lathe with spindle bore too small to handle barrell blank. Think I can rely on steady rest and 4 jaw to maintain .0005 concentricity to bore when reaming and cutting center countersinks? From there I go to centers.
Please hold the camera steady
ka5kla 2 months ago
I cringed when I heared the noise at the end of the video...
what was this?
sanfte8 2 months ago
bullshit it needs to run true im a machinist yor off centre buddy
trankuser9 6 months ago
is it just me or does the barrel seem to be spinning off center?
Strom63 6 months ago
@Strom63
If your looking at the outside of the barrel past the tennon it likely is off center, every barrel Ive ever came across has at least .020 or so runout on the outside diameter when dialed in off the bore or set between centers using the bore.
BRJonathank 6 months ago
@Strom63
The outside diameter of a barrel can have quite a bit of run and its pretty normal to see. Barrels are dialed in with the inside diameter of the bore or set up between centers of the bore like in this situation. As long as the bore, the threaded tennon and the chamber are running true the outside of the barrel doesnt really matter
BRJonathank 6 months ago
Thanks for posting the video. Only suggestion would be don't hold the barrel in the steady over the threads. Support it in the steady rest just past the threads on the shoulder.
TheManFromAlaska 10 months ago
@TheManFromAlaska I put the steady on the threads as the threads are cut concentric to the bore.....The outside of the barrel could be off by .050 (Ive seen). I guess you could true up a section in front of the tenon and put your steady rest there
BRJonathank 10 months ago
I had always head its a bad idea to ream a chamber under power and it was best left to being done by hand? your thoughts?
jeep4x4greg 1 year ago
@jeep4x4greg I once heard that that the old tymers did it by hand...So I asked an od tymer and he told me it would take a week to do one chamber and your hands would be too sore to do it on a regular basis
BRJonathank 1 year ago
I have a lathe with spindle bore too small to handle barrell blank. Think I can rely on steady rest and 4 jaw to maintain .0005 concentricity to bore when reaming and cutting center countersinks? From there I go to centers.
Shombroni 1 year ago
@Shombroni .0005 ?
haha, ask Nasa maybe.
4553gerrit 9 months ago