An edge finder is a tool that accurately positions a milling machines Z axis against a vertical edge. This enables you to set the X and Y axis datum offsets on a part that you need to mill. It doesn’t matter how big or how small your machine is, these tools operate in the same way. You can expect to get an accuracy better than .0005” using an edge finder. The most common design of edge finder consists of a metal tube for the main body. A cap screws into the top of the main body and a contact head is connected to the cap with a spring through the center of the body. The contact head is free to slide against the body with the spring keeping it held in place. Please contact for more details.