We need, for example to produce some hemisphere with some diameter .
In order to fabricate a sheet metal workpiece the desired diameter, preferably to some simple calculations.
Step 1: For Example, We Make This Earring
We need to make a hemisphere with same diameter
Here we go, we have a formula
We make a calculation, it says that we need a workpiece diameter about 17mm
Now we have what we need.
P.S.Sorry my english is awesome, I learning it.