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This was my third set of tooling. I could have spent $4000 to buy a hydraulic crimper that could only handle a 2 inch outer diameter. Machines going up to 3-4 inches are $50,000. I tried a two point crimp first, but the problem is that the band keeps popping back up if you do not hold it down. I found out that you must hold it in place all around the ring. The fingers have to be adjustable to move in as you squish it and rotate the band. It is kept low cost by only having one active compression finger with the force provided by any simple shop press. Total cost was a day of my life and $20 in materials.
I made it large enough to do a Russian 85mm AP that is waiting for its turn. I started with a US 75mm M62 AP shown above. I plan on trying as small as 37mm with this same tool.
Here is the finished band after machining on the lathe. This is the first time I tried a pure copper band vs. brass. I will not do that again. It is hard to machine as it likes to tear rather than be cut. It took much longer than brass. You have to run at high speeds with lots of lubrication to machine copper. I can see why there are issues with copper fouling in barrels.
That might be, but you have one hell of a result, nearly perfect! ik like it when technical people are involded with our hobby. Nice job there in Texas!
Nylon should be easy. You can put on a ring with a split to fill in the groove. Then you can put a loose ring over the top. Spin it on a lathe until it gets hot and friction welds together. Then machine to finished dimensions.
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