AR-15 and M-16 manufacturing facts
Posted 29 June 2012 - 04:18 PM
Jumping ahead a hundred or so years to the M-16, manufacturing then was light years ahead from the time of the Civil War, but the premise of interchangeablility was still there, along with new materials, cutting tools and machinery, and cutting fluids, we just got better at it. So when this gun gets into the battle field, the real short commings surface.
Thousands of words were written about "loosening up the tolerences" of that firearm to solve the problems of jamming. This will not work...period...in order to keep interchangeability at the front of the line. What really happened was the "clearences" were opened up by just a few thousanths of an inch, but the high tolerances were kept the same, otherwise, you can get a collision or an interference with its mating part.
Thermal expansion is another word. A lot of gun barrells are now out of stainless steel. When it comes to thermal issues, stainless steel is far worse than aluminum. Just ask any welder that welds stainless sheet metal parts. Fluted barrells, are a gimmick many shooters fall into. How many everyday shooters, shoot that many bullets, to get their gun that hot? In order for the flutted barrell to work effectively and stay stable, every flute has to be exactly in the center axis of the bore. Every flute has to be exactly alike in every diminsion with +/-0.00000" tolerance. There is nothing better than a good, high grade steel barrell.
So, when you go to buy your next gun and want a fluted barrell, ask what the tolerances are of the flutes. From my first job in the metal trades in 1970, and having my own laser/cnc machine shop for the last thirty years, quality is everything, and tolerances are first. Some good reading is anything about Pratt and Wittney, and also anything on Dr. Demming. The single most important man to bring America's Industry to full production during WWll.
Posted 30 June 2012 - 07:34 AM
Posted 01 July 2012 - 10:11 PM
Posted 28 July 2012 - 10:59 AM
Just my view from my knothole... Stainless steel has some advantages as a barrel material over carbon steels (4140). The higher nickel and chromium content provides wear and errosion resistance advantage over carbon steel. Thermal expansion is much less than aluminum, but not a lot different than carbon steel.
Posted 28 July 2012 - 12:41 PM
Posted 15 August 2012 - 11:32 PM
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