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Barrel machining finishes |
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Niterace
Recruit Joined: Aug 01 2017 Location: Minnesota Status: Offline Points: 13 |
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Posted: Aug 15 2019 at 11:48am |
I am wondering about barrel finishes. Some are ground smooth and some are left with obvious machining marks all along the barrel. Was this process specific to different manufacturers? Did it vary by time period? Was a final cosmetic process left off in the interest of time during peak production? I currently have several examples of each finish from nearly all manufacturers, and can find no discussion of this issue. Any guidance is much appreciated!
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David Milisock
On Point Joined: Aug 03 2019 Location: USA Status: Offline Points: 334 |
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I've wondered about the processes myself, I have read that the Buffalo Arms barrels were of poor shooting quality however my Quality Hardware carbine has the Buffalo barrel and it shoots exceptional for a 30 carbine.
Anyone with insight please post, I'm in need of enlightenment. :-)
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David Milisock
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New2brass
Moderator Group Dan Pinto, Photo Editor Joined: Nov 29 2015 Location: CT Status: Offline Points: 4627 |
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Barrels were originally required to be finish ground. It was found leaving them rough helped better to dissipate the heat. This also saved an operation and therefore time. It was approved, yet some still ground the barrels.
Turned and ground smooth Turned Turned may be subjective term, They were turned on a specialized machine like a lathe that actually roughed out all the groves at the same time. If you look you will see it is not a conventional turning where the grooves follow a spiral pattern like a screw thread. I cannot think of the name of the process/machine at the moment, if anyone knows please chime in.
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blackfish
On Point Joined: Mar 30 2016 Location: 999-0 Status: Offline Points: 289 |
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I think those grooves form a spiral just like the thread of a screw. Grooves pictured on the Inland are fine, those on Underwood are much coarser - just a difference in machining. The spiral pattern can be difficult to eyeball if you don't have excellent visual focus and extreme powers of concentration. To see the spiral, it's easier take something pointed which won't scratch the finish, like a toothpick, and, starting at the muzzle end, use the point to follow the groove around, like a needle in a record. After a couple of turns with the point held continuously in the groove, it'll be obvious you'll end up at the breech if you keep going. To wit, the grooves are not "concentric circles'
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David Milisock
On Point Joined: Aug 03 2019 Location: USA Status: Offline Points: 334 |
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Hey man as long as it shoots great I'm good to go. The improved cooling makes sense to me.
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David Milisock
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Niterace
Recruit Joined: Aug 01 2017 Location: Minnesota Status: Offline Points: 13 |
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Is there any record of who did what and when? Or at least some general date/contractor guidance?
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