Abstract: A machine for the duplication of keys comprises a frame on which a carriage, supporting juxtaposed clamps for a sample key and a blank, is swingable about a horizontal guide bar and slidable along the latter. The clamps are held on a common support which is pivotable on the carriage about an axis parallel to the guide bar to facilitate the cutting of convex or laterally slanting lands in a key bit. Two uprights on the frame carry a cutting wheel, rotating on a shaft parallel to the guide bar, and a feeler engageable with the sample key, the feeler having the shape of a vertical blade with a convex key-contacting edge whose radius of curvature equals that of the cutting wheel. The feeler may be spring-urged toward the clamp support and repressible by its contact with the sample key into registry with the cutter periphery.