We all have had nightmares with all the carriers. Two weeks ago I had a customer in Florida ship two custom barrels, one heavy and one light gun to me by UPS. When the package arrived it was no longer round (4"round cardboard tube)but more oval shaped. It obviously had been run over or put under a lot of pressure. One does not normally think much about barrels getting bent or pinched. The customer told me the barrels had been rolled on a steel plate and checked for straightness an no detectable defect. I took the barrels and unwrapped them. Then mounted them on centers on a lathe.
the larger barrel(1.300") turned .0004"TIR at the tenon end and .004"(TIR) at the muzzle end. I took and indicator zeroed at one end and moved the carriage to the other end watching the dial. I turned it 90 degrees and repeated the process. turned it another 90 degrees and repeated the process. I found at about 1/3 the way from the tenon the barrel began to show a bow. I repeated the same test on the light barrel. The tenon end showed .004" TIR, and the muzzle end showed .015"TIR. I called the barrel manufacture and asked what tolerances they had for their barrels. I was told their goal was dead nuts no run out but .002" was with in acceptable tolerance. Both of these barrels are well out of the manufactures spec. The barrels have been returned to the customer and he is dealing with a claim with UPS. This shows how a barrel can be effected by being caught in a conveyor or run over by a fork lift or truck. Remember .0010" can mean 20" or more inches at 1000 yards. Just thought I would share this with the readers.
Packaging is everything when shipping using any carrier.
Nat Lambeth
the larger barrel(1.300") turned .0004"TIR at the tenon end and .004"(TIR) at the muzzle end. I took and indicator zeroed at one end and moved the carriage to the other end watching the dial. I turned it 90 degrees and repeated the process. turned it another 90 degrees and repeated the process. I found at about 1/3 the way from the tenon the barrel began to show a bow. I repeated the same test on the light barrel. The tenon end showed .004" TIR, and the muzzle end showed .015"TIR. I called the barrel manufacture and asked what tolerances they had for their barrels. I was told their goal was dead nuts no run out but .002" was with in acceptable tolerance. Both of these barrels are well out of the manufactures spec. The barrels have been returned to the customer and he is dealing with a claim with UPS. This shows how a barrel can be effected by being caught in a conveyor or run over by a fork lift or truck. Remember .0010" can mean 20" or more inches at 1000 yards. Just thought I would share this with the readers.
Packaging is everything when shipping using any carrier.
Nat Lambeth