Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Gunsmithing


Reply

Barrel Bore Curvature

 
LinkBack Thread Tools Display Modes
  #1  
Old 02-01-2012, 03:24 PM
Edd Edd is online now
Gold Member
 
Join Date: Jan 2011
Location: Tulsa
Posts: 999
Barrel Bore Curvature

How many of you index the curvature of the barrel bore and how do you determine the direction of the curve?
Reply With Quote
  #2  
Old 02-01-2012, 03:57 PM
Platinum Member
 
Join Date: Mar 2005
Location: Utah
Posts: 1,377
Re: Barrel Bore Curvature

Dial in the section of barrel where the chamber will be. Then indicate the muzzle end, and mark the high spot.
Reply With Quote
  #3  
Old 02-05-2012, 12:26 AM
Edd Edd is online now
Gold Member
 
Join Date: Jan 2011
Location: Tulsa
Posts: 999
Re: Barrel Bore Curvature

This topic hasn't got much action. Is it because everyone does it like Grit or is it because not many even index the bores?

Using search, I've found more reading about indexing flutes than I have about bore curvature.
Reply With Quote
  #4  
Old 02-05-2012, 12:49 AM
Gold Member
 
Join Date: Apr 2009
Location: Carrollton, Ohio
Posts: 573
Re: Barrel Bore Curvature

Quote:
Originally Posted by Edd View Post
This topic hasn't got much action. Is it because everyone does it like Grit or is it because not many even index the bores?
I never heard of it. I subscribed to the thread in the hopes of a discussion on the condition/issue.
__________________
"If you love wealth more than liberty, the tranquility of servitude better than the animating contest of freedom, depart from us in peace. We ask not your counsel nor your arms. Crouch down and lick the hand that feeds you. May your chains rest lightly upon you and may posterity forget that you were our countrymen."-- Samuel Adams
Reply With Quote
  #5  
Old 02-05-2012, 02:54 AM
Platinum Member
 
Join Date: Mar 2005
Location: Utah
Posts: 1,377
Re: Barrel Bore Curvature

I doubt many besides smiths ever think about it. I don't believe factory smiths pay it any attention at all.
Reply With Quote
  #6  
Old 02-05-2012, 09:43 AM
Platinum Member
 
Join Date: Jan 2005
Location: OK
Posts: 2,145
Re: Barrel Bore Curvature

Your question is simple but the answer is much more complicated than "who does what"

"How do you find the curvature?" you look down the barrel either in or out of the lathe.
Your eye needs to be a little trained to do this.

Don't expect to either see a curve, or have a curve that only goes in one direction for the length of the barrel. Every manf. seems to have a different handle on how to create a straight bore, and I'm sure some don't care. I typically use the barrel makers who try and drill nice straight holes.

Now depending on how the smith sets-up, and chambers, the barrrel will determine how effective or needed it is to indicate the curve. Or weather in the end it makes any or no difference at all.

If you ream start to finish with the reamer you may chose one way, if you drill and bore before reaming you may do it the other. Their is a multitude of ways to indicate and cut a chamber. I happen to think my way is the best, thats why I do it that way. Ask any smith and thats likly what he will tell you.

In the end no matter which way it was done, if it was done properly the difference in the guns ability to shoot will likly be more effected by other things in the process of the assembly, components and implementation.
Reply With Quote
  #7  
Old 02-05-2012, 09:58 AM
Platinum Member
 
Join Date: Dec 2011
Location: S.E. Michigan
Posts: 3,421
Re: Barrel Bore Curvature

Interesting subject.

Every (considered straight bore or line) is curved if the tolerance of measurement is fine (close enough). Gaging in thousands is like a potholed road compared to millionths..... or.... 0.001 versus 0.000001.... and it has everything to do accuracy of the machine tool, tooling, ambient temperature at which the machining took place, remperature at the cutting edge, operator skill and a multitude of other varibles.

In reality, nothing is straight, everything has curvature to some degree when the unit of toerance become acute.

So, the term straight without curvature applies to the degree of acceptable accuracy in the machining process, the cost of the process and the degree of acceptance by the end user in relationship to the cost......
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Barrel Bore Curvature
Thread Thread Starter Forum Replies Last Post
Bore not concentric with OD of Custom barrel & qualifications blackbrush Gunsmithing 5 02-05-2011 05:15 PM
Bore size of 7mm barrel? desertbull Rifles, Bullets, Barrels and Ballistics 6 10-17-2010 06:54 PM
need ideas for new gun and who to bore scope a barrel for me bigrich954rr Rifles, Bullets, Barrels and Ballistics 4 10-27-2006 05:11 AM
Large Bore Barrel BABore Rifles, Bullets, Barrels and Ballistics 1 12-31-2004 10:21 AM
What benifit does a tight bore barrel have Rifles, Bullets, Barrels and Ballistics 4 03-20-2004 09:21 PM

Current Poll
Have You Ever Backpack Hunted?
YES - 62.22%
1,046 Vote
NO - 37.78%
635 Votes
Total Votes: 1,681
You may not vote on this poll.

All times are GMT -5. The time now is 10:53 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC