A picture-framing vise, or miter clamp, has screw holes on the bottom for attaching to a workbench. But for occasional framing it can get in the way of other benchwork. A solution is to mount it on a wooden base that can be readily clamped and unclamped in your bench vise. The base can be of scrap wood, and made up so that the framing vise will be about chest high for comfortable working.
Say you’re building a deck in your yard and have to cut a 10-in. thick post in half. How do you do this with a circular saw with just an 8-in. blade? Make matching straight cuts on opposite sides of the timber. Set the thickness guide to just over half the woods width.