Saw Piercing — Hand Cutting of Sheet Metal at the Bench
Saw Piercing — Hand Cutting of Sheet Metal at the Bench
Jewellery-making technique in which a piercing saw cuts intricate openwork patterns from sheet metal
Saw piercing is the bench technique in which a jeweller uses a hand-held piercing saw, fitted with a fine blade typically between 0.15 and 0.30 mm thick, to cut intricate patterns, openwork shapes, or decorative cutouts from sheet metal. The blade is tensioned in a saw frame and guided vertically through the sheet, which is supported on a wooden bench peg. Saw piercing is the foundation of much fabricated jewellery — bezels, gallery wires, openwork pendants, fretwork panels, and architectural elements — and is the technique against which laser cutting and water-jet cutting are now compared in production decisions.
Process
The work begins with a design drawn or transferred onto the sheet, often using a pencil or marker, occasionally by photo-etched or printed transfer for complex repeating patterns. Where the cut is internal — that is, fully enclosed within the outline of the piece — a small pilot hole is drilled at the start of the cut. The saw blade is released from the upper clamp of the frame, threaded through the hole, and re-tensioned. The jeweller then saws around the internal feature, returning to the start point or to the outer edge.
The saw is held vertical, with the workpiece supported on a bench peg cut with a V-notch or slot that allows the blade to pass freely through. The cutting motion is a smooth vertical stroke; lateral pressure or twisting in the cut breaks blades. Tight inside corners are negotiated by sawing into the corner, then sawing out and back along the cut to turn the blade without forcing it.
Applications and design
Saw piercing is fundamental to filigree gallery wires, to openwork bezels and gallery settings, to pierced earring panels and pendants, and to the decorative ajouré work characteristic of Art Nouveau and Art Deco jewellery. Production work has migrated in part to laser cutting and water-jet cutting for repeated patterns, but bespoke and bench-fabricated jewellery still relies on saw piercing for its responsiveness to design changes during the cut and for the slightly softer edge quality the hand process produces. Saw-pierced work is also less prone to heat-affected zones than laser-cut metal, which can matter for subsequent soldering or annealing.
Tools and materials
The technique requires a saw frame, an assortment of blades from 8/0 (very fine) to 4 (coarser), a bench peg, a drill or flexible-shaft handpiece for pilot holes, and beeswax or a proprietary blade lubricant. The metal is typically held flat against the peg or, for small parts, in a small hand vice. Annealing soft sheet between cuts can reduce blade breakage on heavier work.
In the trade
Saw piercing is a foundational bench skill taught at the start of any classical jewellery training. The quality of pierced work — clean edges, true lines, square inside corners — is one of the marks the trade uses to assess a maker. For repair work, where the geometry is unique to a damaged piece, saw piercing remains the only practical option.