Precision Aluminum Circle Scribing Tool

This manually operated circle layout instrument combines a rigid aluminum beam (18 cm long), a conical center locator, and a linearly adjustable pusher — all engineered for metric-scale woodworking tasks. The beam features engraved millimetre markings from 0 to 150 mm, allowing direct reading of radius values without calculation. Weight is 120 g, balancing responsiveness with stability during rotation. Material thickness is 4 mm, minimising flex under lateral pressure. Functionally, it replaces traditional compasses and string-based methods by anchoring securely at a central point and rotating around it while the pusher contacts the workpiece. The center finder’s tapered geometry seats firmly into shallow indentations or pilot holes, preventing lateral walk-out during full 360° sweeps. Adjustment is achieved via friction-fit movement — no knobs or levers to misalign or strip. Used extensively for architectural model-making, bespoke joinery, and restoration work — particularly when replicating historic curved profiles or adapting designs across varying timber thicknesses where depth-of-cut consistency affects final fit.