Key Cutting and Duplication: Machines and Accuracy
Every metal key is a physical encoding of a lock's internal pinning. Key cutting copies that encoding onto a blank using depth and spacing measurements — whether by tracing an original, decoding a lock, or punching a factory key code into a machine.
Accuracy within thousandths of an inch separates smooth operation from sticky keys. Professional locksmiths calibrate machines, stock manufacturer-specific blanks, and understand when a worn original should be decoded rather than duplicated verbatim.
Duplication vs. Origination
Duplication traces an existing key. Origination creates a new key from a code book or software when no key is available — common after lockouts and lost keys. High-security profiles may require factory authorization.
Machine Types
Manual duplicators use tracing styli and cutters. Punch code machines (e.g., Framon-style) originate keys from depth keys. Laser and dimple cutters handle modern automotive and high-security sidewinder profiles.
Blanks and Keyways
Thousands of blank profiles exist — SC1, KW1, Y1, etc. Using the wrong blank width causes binding. Restricted keyways limit blank distribution; "Do Not Duplicate" stamps are policy warnings, not legal barriers.
Automotive and Specialty
Transponder keys add electronic programming after mechanical cutting. Tubular, cruciform, and dimple keys need specialized vises. See smart keys for proximity fob workflows.
Quality Control
Technicians deburr cuts, verify shoulder stop position, and test in the lock before handing keys to customers. Slightly high cuts wear pins; low cuts fail to lift drivers to the shear line.