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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New barrel maker with new technology
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<blockquote data-quote="JR" data-source="post: 145519" data-attributes="member: 1965"><p>[ QUOTE ]</p><p></p><p></p><p>2 - in my "why not" thread, I proposed an idea that could solve this problem as well. Chamber after gun drilling, before the rifling is cut. Then, machine a "chamber plug" that exactly fits the chamber. With an oversized "cap" on this chamber plug, it could be threaded onto the breech of the barrel. Gun drill this plug to fit as closely and seamlessly as tolerances will allow. Then, the rifling is cut into the bore, and continued into the chamber plug. This way, when you hand lap the bore, you can run the lap down into the chamber plug, allowing you to lap the throat right along woth the rest of the bore, and the "funneling" or bell shaped widening at the point where the lap is reversed is in the chamber plug, and not in the bore itself. This creates a perfectly lapped bore, with no cross directional tooling marks at the throat from the chambering, meaning no break in for the barrel! </p><p></p><p>[/ QUOTE ]</p><p></p><p>I have rifled barrels which were 'rough' chambered not after gun drilling, mind, but after they have been finish bore reamed. Process of rifling is generally drill, ream, rifle. This had to be done, because the machine could only handle 'x' length of rifled barrel, and the rough chamber allowed me the ability to index the cutting tool outside of the bore.</p><p></p><p>Lapping a barrel is not a light application, but heavy duty. There is a lot of work done to the barrel in the lapping procedure. Depending on the uniformity and finish of the bore from end to end, lapping can take hundreds upon hundreds, and even more hundreds, of strokes.. Even if you inserted a chamber plug into the barrel, the taper of the leade would be affected greatly, or it wouldn't work at all. It is the tool marks on the leade 'angle' which is wanting to be smoothed out, and you wont do that with the typical barrel lap, precisely. And if the lead angle is not protected, in not too many swipes your throat would be wiped out by the typical barrel lapping procedure.</p><p></p><p>I hate to say it, BLASPHEMY on my part, but in that particular case and citing available technology, firelapping with impregnated lead bullets would be the better choice, as the parallel of the bullet would slide across the leade surface more evenly and into the rifling. You would get more consistent contact where needed in the throat region. </p><p></p><p>Either that or come up with a procedure to push lap a same caliber size lead projectile thru the chamber. coat them in gunk, and push them thru one at a time. cut or have a mold made to form grooves perpendicular to the bore in the parallel section to hold the lapping compound, use a lot of oil, and set the mold up so you can cast it to the end of your dewey rod. The procedure would be much like 'slugging' a barrel.</p><p></p><p>JR</p><p></p><p></p><p>JR</p></blockquote><p></p>
[QUOTE="JR, post: 145519, member: 1965"] [ QUOTE ] 2 - in my "why not" thread, I proposed an idea that could solve this problem as well. Chamber after gun drilling, before the rifling is cut. Then, machine a "chamber plug" that exactly fits the chamber. With an oversized "cap" on this chamber plug, it could be threaded onto the breech of the barrel. Gun drill this plug to fit as closely and seamlessly as tolerances will allow. Then, the rifling is cut into the bore, and continued into the chamber plug. This way, when you hand lap the bore, you can run the lap down into the chamber plug, allowing you to lap the throat right along woth the rest of the bore, and the "funneling" or bell shaped widening at the point where the lap is reversed is in the chamber plug, and not in the bore itself. This creates a perfectly lapped bore, with no cross directional tooling marks at the throat from the chambering, meaning no break in for the barrel! [/ QUOTE ] I have rifled barrels which were 'rough' chambered not after gun drilling, mind, but after they have been finish bore reamed. Process of rifling is generally drill, ream, rifle. This had to be done, because the machine could only handle 'x' length of rifled barrel, and the rough chamber allowed me the ability to index the cutting tool outside of the bore. Lapping a barrel is not a light application, but heavy duty. There is a lot of work done to the barrel in the lapping procedure. Depending on the uniformity and finish of the bore from end to end, lapping can take hundreds upon hundreds, and even more hundreds, of strokes.. Even if you inserted a chamber plug into the barrel, the taper of the leade would be affected greatly, or it wouldn't work at all. It is the tool marks on the leade 'angle' which is wanting to be smoothed out, and you wont do that with the typical barrel lap, precisely. And if the lead angle is not protected, in not too many swipes your throat would be wiped out by the typical barrel lapping procedure. I hate to say it, BLASPHEMY on my part, but in that particular case and citing available technology, firelapping with impregnated lead bullets would be the better choice, as the parallel of the bullet would slide across the leade surface more evenly and into the rifling. You would get more consistent contact where needed in the throat region. Either that or come up with a procedure to push lap a same caliber size lead projectile thru the chamber. coat them in gunk, and push them thru one at a time. cut or have a mold made to form grooves perpendicular to the bore in the parallel section to hold the lapping compound, use a lot of oil, and set the mold up so you can cast it to the end of your dewey rod. The procedure would be much like 'slugging' a barrel. JR JR [/QUOTE]
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