There are a few ways to put a new band on your projo, depending on what you have for tools and material. If you can find it at a scrap yard, you can get scrap copper plate about 3/8" thick to make a band. Using a band saw or table saw with carbide blade, you can cut a strip to wrap around the projo, hammering it into the groove on the projo. You can bring the ends together and solder them, or better yet, if you can find someone with a Tig torch, you can tig the ends together and then turn it on your lathe. It helps to have a big vise, to help squeeze the copper strip around the projo. It doesn't bend very easy. It also helps to heat it with an acetylene torch. If you try to Tig the ends of a strip together, you will need to preheat the copper a lot with the torch, as the copper sucks the heat away from the weld. The best welder to use would be a Mig, using copper wire, then you wouldn't need to preheat the copper band. I've done the Tig thing once using a water cooled Tig, to get enough heat, to put a band on a 75mm projo. Be careful that the Tungsten doesn't melt into the copper. If it does, you will need to remove it, because the arc will keep jumping to the piece of tungsten.
Another method is to find some large diameter copper pipe (scrap yard). Part off some rings with your lathe. Since the copper pipe is thinner wall you might need a couple of concentric layers. You can split the ineer layer to fit in the groove, as the outer layer will cover the split mark. Put one in the groove, and then one on top of it. If you find the right size pipe, you could slide a hot copper ring around the projo, to shrink onto the ring filling the groove. You can then run some solder between the rings and finish turn it on the lathe.
I would advise that you visit your local scrap yards and search the copper bins. You would most likely need to repaint your projo, as all that heat and work will screw up the paint.
Another method is to find some large diameter copper pipe (scrap yard). Part off some rings with your lathe. Since the copper pipe is thinner wall you might need a couple of concentric layers. You can split the ineer layer to fit in the groove, as the outer layer will cover the split mark. Put one in the groove, and then one on top of it. If you find the right size pipe, you could slide a hot copper ring around the projo, to shrink onto the ring filling the groove. You can then run some solder between the rings and finish turn it on the lathe.
I would advise that you visit your local scrap yards and search the copper bins. You would most likely need to repaint your projo, as all that heat and work will screw up the paint.
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