Copper Bowl - First attempt!

**Wallace** · 05-09-2012, 10:12 PM

bowl envy! Fab work and workshop Peter - but I expect nothing less, amazing work.

**ps_bond** · 06-09-2012, 11:30 AM

Originally Posted by Kwant

oh lol forgive me for talking about you as if you are not here I did not see your post :P

Pah, I'm used to it

**medusa** · 07-09-2012, 06:20 PM

Originally Posted by ps_bond

That sounds a little strange, Tabby - annealing in time should have prevented the fractures; overworking it after it work hardened could well cause the fractures (although overheating in annealing can cause problems too).
As for 1mm being too thick - erm...

Sunk bowl, 1.5mm copper.

OK, so how big was the original circle to make that and is the bowl thinner than 1.5 mm now?

And I'm aware it probably sounds like stupid question but...

**ps_bond** · 07-09-2012, 09:04 PM

Not at all! With sinking, the end diameter is more-or-less the same as the start. Raising you reduce the diameter from the start, compressing the metal in on itself.

This isn't a great shot, but it may help:

Both started out the same diameter; the one on the right is raised, the left is sunk. I'm not convinced that the thinning shows up all that well, but the middle third of the sunk bowl is where it is thinnest.
They're not mine, BTW - they were visual aids for the course.

**Kwant** · 08-09-2012, 02:48 PM

As I had the kiln going this afternoon, I did get round to enamelling the little bowl. As usual trying to run before I can walk I attempted to leave a bare bit that is supposed to be my logo, it kind of mostly worked:

Copper bowl enamelled by kwant, on Flickr