keyseater

A keyseater is a machine tool used to cut keyways, which are slots in rotating shafts or holes to accommodate keys. Keys are mechanical components used to connect rotating elements like gears, pulleys, or sprockets to shafts, preventing relative rotation. The keyseater ensures a precise and secure fit for the key, which is crucial for transmitting torque efficiently and preventing slippage.

There are two primary types of keyseaters: push-type and pull-type. Push-type keyseaters use a cutting tool that is pushed through the workpiece to create the keyway. This method is generally used for cutting internal keyways in gears or pulleys. Pull-type keyseaters, on the other hand, use a cutting tool that is pulled through the workpiece. This type is often preferred for cutting external keyways in shafts or for creating longer keyways.

The operation of a keyseater involves setting the workpiece in a vise or fixture, selecting the appropriate cutting tool (often a broach), and then engaging the cutting mechanism. The cutting tool moves linearly through the material, removing chips to form the desired keyway. The depth and width of the keyway are precisely controlled by the machine's settings and the chosen cutting tool. Keyseaters are essential in manufacturing and repair operations where precise shaft-key connections are required.