A flat disc and a curved surface catch light in very different ways. Doming gives sheet metal depth, creating rounded elements that can become earrings, pendants or components for a larger design.
What does a doming block do?
A doming block, also called a dapping block, provides curved recesses against which metal is formed with a rounded punch. The block supports the outside of the curve while the punch works from inside. Blocks are made in materials including wood, nylon, brass and steel; their recesses vary in size and depth. A block and a set of punches are separate parts of the working system.
Begin with a prepared blank
Cut a disc or other suitable shape, then file away sharp edges. Metal must be soft enough to form. Annealing may be needed before starting and again as the metal becomes harder through working. Use the correct annealing and cleaning procedure for your alloy; this introduction is not a torch-work lesson.
Build the curve gradually
Start with a generous recess that accommodates the blank. Use a suitable rounded punch and controlled taps, checking the shape frequently. For a deeper dome, progress through smaller recesses in stages. Do not try to obtain the final depth with one heavy blow. If the metal becomes resistant, stop and reassess its hardness rather than simply striking harder.
Keep the contact surfaces clean
Marks or grit on the tooling can transfer to the work. Inspect the recess and punch before use, keep abrasive dust away from the forming area and check the metal surface as the shape develops. A clean curve gives the later finishing stages a better starting point.
The JTR brass doming block
Our 50mm brass doming block has over 30 half-round recesses ranging from 2mm to 36mm. It is supplied as one solid brass block; punches and striking tools are not included. The recess measurements describe the tool, not a guaranteed finished dome size.
Watch the technique
Kim Thomson demonstrates doming in this Kernowcraft tutorial. The demonstration illustrates the technique; the tools shown are not the contents of the JTR listing.
Continue with our guide to fine emery paper, or explore more practical guides.