Lead came is a soft metal and can be easily  bent by hand and cut with a hand tool.  The copper "came" used in this window is a very hard, stiff metal. A small metal roller is used to bend the copper to the precise radius required.  The bent piece of copper is then set up with a jig and cut on a table saw. A separate jig is set for each different angle on each end of each piece of copper channel . This does take some time.

Fractured Space III

Progress pictures from initial drawings thru cutting, building and final framing.
Design, Glass Selection, Cutting, Assembly, Framing by Steve Daley

Full size working drawing. This panel measures 28" wide x 24 tall".

Here, assembly or "glazing" is underway. Typically, stained glass windows are assembled using lead channels holding  the pieces of glass together.  This piece features the use of wide copper channels in addition to the traditional lead channels (aka lead "came").

Heavy paper patterns serve as glass cutting templates.

Stained Glass Design Fabrication, Restoration & Repair - Johnson County Stained Glass - Kansas City - Estb 1982

The Finished Panel In Various Lighting Conditions

In progress glass cutting.