A marking gauge is a hand tool used in woodworking and other trades to accurately mark lines parallel to an edge or surface of a workpiece. It is commonly used for tasks such as marking out joinery, scribing lines for cutting or chiseling, and laying out measurements.




The basic design of a marking gauge consists of a beam or stock, a marking or cutting element, and a locking mechanism. The beam is usually made of wood or metal and has a straight edge that is placed against the reference surface. The marking element is typically a hardened steel pin or wheel that extends from the beam and makes contact with the workpiece, leaving a precise mark or score. The locking mechanism allows the marking element to be set and secured at a desired position along the beam.

To use a marking gauge, you set the desired distance or width by adjusting the marking element along the beam and then tighten the locking mechanism to secure it in place. The marking element is then pressed against the workpiece, and by running the gauge along the surface, a parallel line is marked or scored.

Marking gauges are available in different styles and variations. Some have a single marking pin or wheel, while others may have multiple pins or wheels for marking multiple lines simultaneously. Some marking gauges also feature additional features, such as adjustable heads or interchangeable marking elements, to accommodate different marking needs.

In addition to marking parallel lines, marking gauges can also be used for tasks such as mortise and tenon layout, transferring measurements, and aligning workpieces during assembly.

Overall, a marking gauge is a versatile tool that enables precise marking and layout work in woodworking and other trades. It provides a reliable and efficient way to establish accurate lines parallel to a reference edge or surface, making it an essential tool for achieving precision in woodworking projects.