Riffler Files — Curved Bench Tools for Detail Work
Riffler Files — Curved Bench Tools for Detail Work
The set of profiles a working bench keeps for inside curves and recessed surfaces
Riffler files are the family of curved, double-ended hand files carried as a set on most working jewellery and lapidary benches. Where a flat or half-round file can dress an external surface, the riffler is shaped to reach inside concave forms, undercuts, channel settings, and the recesses of pierced openwork. The set is bought as a complement to standard hand files rather than as a replacement, and a competent bench will carry both.
The set
A standard riffler set runs to ten or twelve files, each with a different combination of cutting profiles at the two ends. The full vocabulary covers round, half-round, oval, flat, barrette, knife-edge, triangular, three-square, crossing, and various spoon profiles. Each profile is intended to fit against a particular geometry: the spoon profile drops into hollowed grounds, the crossing profile dresses the meeting of two concave curves, the barrette files flat without cutting into adjacent walls.
Cutting grade is specified in the Swiss cut system, with grades 0 through 6 in common use. Cut 2 is general-purpose; cuts 4 and 6 are reserved for fine finishing where the surface must take a polish without coarser tool marks below.
Bench technique
Rifflers are held in the fingers rather than fitted with a handle, and the work is moved against the file as often as the file is moved against the work. The slim midsection allows the user to reach into a deep feature and to feel the cut through the fingertips, which is essential when working inside a setting where overcutting damages the seat for the stone or compromises the visible profile of the piece.
The most common errors with rifflers are overlong strokes and side loading. Both produce ridges and waviness in the cut surface that have to be removed with subsequent finishing. Short, controlled strokes with the file lifted on the return are the standard practice.
Quality and storage
A good Swiss-made set in hardened tool steel will hold its cut through years of bench use. Cleaning with a file card after each session removes embedded swarf — gold and silver in particular pack into the teeth and dull the cut quickly. Storage in a roll or fitted rack prevents the cutting teeth contacting one another. Cheaper imports do not justify the saving over a working life.
Common applications
Common bench applications include refining inside curves on cuff bracelets, cleaning sprue and flash from cast components, dressing the inside of pierced openwork, adjusting bezel seats and gallery rails, and finishing the inner surfaces of recessed engraving. In lapidary carving, rifflers handle the transition from rotary shaping to hand finishing in concave forms, particularly in jade, agate, and chalcedony.