Before features can be machined onto a metal workpiece, their positions must be located using an edge finder or centre finder. They are both essential tools in the machining of parts.
Edge finders are effective devices for locating the edges of parts in relation to the spindle of the milling machine or drill press. Using an edge finder will ensure that the spindle is in the correct position for machining features such as holes of grooves.
As the name suggests, centre finders are used when the centre of a part needs to be found. This is an important step in preparing to machine a hole or slot in the part using a drill press or milling machine.
Both centre and edge finders can also be used to locate the centre of a hole in a part.