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Post by Deleted on Feb 1, 2009 2:13:03 GMT
I'd like to make a kojiri for a tanto with a simple cupped design to fit the shape of the saya. I was thinkin of something like this: Is it possible to coldforge thin copper (0,5 mm) into this shape with simple tools? If yes, how would you do it?
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Post by 293master293 on Feb 1, 2009 2:25:32 GMT
You should be able too, copper is pretty soft stuff. Experts on this matter may have different things to say. I remember back about 5 or 6 years ago, I cold forged a piece of copper piping into a throwing star. Those were the days.
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Post by brotherbanzai on Feb 2, 2009 20:25:38 GMT
Hi Ichiban, you'll want to anneal the copper first. Not sure if you'll be able to get that much bend out of it without it cracking and folding though. Might be better to cut the shape out with some triangular notches along the inside radius of the curves so that when it's bent around, the notches close and can be soldered with faux copper.
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Post by Deleted on Feb 2, 2009 22:23:36 GMT
Thanks, guys! Yes, I'll try to anneal it, and make a more shallow cupped design. I did a notched and folded design on my last kojiri, but I wasn't totally pleased with the result. Since I'm patinating it the solder seams will show well, so I can't do that.
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Post by Deleted on Feb 2, 2009 23:15:33 GMT
Annealing is required after every couple of hammerings, not just before.
Good luck. I always found copper to be a pain in the ass.
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Post by Deleted on Feb 2, 2009 23:45:18 GMT
Thanks for the info! Will do my best. Here's my first try, the seams where it's folded is visible. Patinated in baking soda.
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Post by Deleted on Feb 3, 2009 1:54:32 GMT
Damn. Looks fantastic for a first try. Solder the seams and you're good to go.
Hell, solder them, sand/file them down, and further patinate the copper. I bet you'll barely notice em at all.
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Post by Deleted on Feb 3, 2009 8:01:01 GMT
Thanks! The seams are actually not so visible in normal light as I chose the pic they showed most, so I consider myself finished with this one. It's patinated to exactly match the fittings.
Hope the next one gets better!
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Post by Deleted on Feb 3, 2009 22:40:30 GMT
+1 for a good job ichiban
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Post by Deleted on Feb 6, 2009 3:46:49 GMT
I agree, that is a very good job! +1
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Post by Deleted on Feb 6, 2009 16:40:03 GMT
Thats pretty awesome.
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Post by Deleted on Feb 6, 2009 17:04:51 GMT
Thanks for the kind words! It's just filed, hammered and bent gently round the saya tip, with the thin copper it wasn't that difficult. What took most time was designing and making a paper template, and final finishing.
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