Step One:

Rough out the soft blank copper disc, using Air Power Hammer and roughing head.
(Sombrero shape...no Finnish-Latin bio name available).

Step Two:

Shrink edge with Hammer and shrinking dies:
Make ruffle.
Shrink ruffle.
Shrink edge heavily

Step Three:

Chase heavy shrink back into panel
Note quality of surface

Step Four:

Planish: either leaving hammer spots (preferred for this)
or without (simple die change)

Elapsed time: 22 minutes.

The bowl can then be annealed (just for stretching) and roughed through
again for a deeper shape.

Shrinking the edge may continue for a long time more before hardness
sets in.
....and the edge thickness? up from .062"? Yep, to .070". Seems pretty well shrunk to me, too.

Kent

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