A milling module for a key cutting machine, the module comprising a first rotary cutter and a second rotary cutter. The first and second rotary cutters each include a gear and a shaft projecting from the gear. The shaft includes one or more cutting blades. The milling module further comprises a housing configured to locate the gears of the first and second rotary cutters, such that the gears of the first and second rotary cutters are arranged in a gear train.

A key cutting machine is provided. The key cutting machine comprises a rotary cutter, an anvil and control circuitry. The rotary cutter is for cutting into the blade of a key blank. The anvil is for stabilising the key blank whilst the rotary cutter is cutting the key blank. The control circuitry is configured to: cause at least one of the anvil or the rotary cutter to move, such that the anvil is located substantially at a first face of the blade of the key blank and the rotary cutter is located substantially at a second face of the blade of the key blank, the second face of the blade of the key blank being on an opposite side of the blank to the first face; and cause the rotary cutter to cut into the second face of the blade of the key blank.