Marking gauges are used to create layout lines for hand cut dovetails, mortise & tenon joinery, and other types of high-quality furniture and cabinet joints. There are many types of marking gauges, but the principles of their use are similar. The goal: create precise and repeatable cuts or scoring marks on wood surfaces that can then be used as reference lines for chisel, hand saw, and/or hand plane cuts. In this concise video overview, cabinetmaker Craig Vandall Stevens will show you how to get optimal layout lines on your next project. (2.5 Minute Woodworking Video)
A shop-made Japanese style marking gauge is used in this video, but the methods and principles shown can be applied to western style tools as well.