The plate joiner in my shop gets a lot of use for joining cabinet parts. But it’s always tough to support and hold the large workpieces (like cabinet sides) in place while trying to make an accurate cut. To make this job easier, I built this jig.
An adjustable cleat on the jig is positioned so the top of the workpiece is flush with the top of the jig. All you need to do is just clamp the workpiece in place (photo at right). This way, you can rest the fence of the plate joiner on the top of the jig (and workpiece) while making the cut.