Greetings George,
I sent you an email about spinning to avoid posting more off topic
stuff in another newsgroup. But I just got a message that the emial
was undeliverable. So here is the text:
Greetings George,
Copper soldered with lead free solder will accept nickel plate. You
may have better luck if you want a seamless part looking for deep
drawn copper cups. There are places that make and sell these as a
standard item. When spinning a flat disc is deformed into a concave
shape. Imagine if you took a piece of aluminum foil and set a can on
it. Then wrap the foil up the sides of the can. There will be many
wrinkles. When spinning properly these wrinkles are flattened out by
displacing metal. This means that the metal must get thicker, longer,
or both, in the cylindrical section.
When making a cylinder with tall sides and a small diameter you can
see that this would require the most displacement of the metal. When
metal is deep drawn the metal is only displaced in one direction, not
two as it would be when spun. Items like aluminum cans, bullet shells,
high pressure gas cylinders and the like are deep drawn. Do a web
search to see some videos of the process.
Cheers,
Eric

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