You can find the step-by-step plans to build this Adjustable Tenon Jig at WoodsmithPlans.com.
A shop-built tenon jig will fit nice and snug on a rip fence the day you build it, but over time it can become loose - or too tight - from changes in humidity. Our tenon jig design solves the problem. Each time you mount the jig, you'll adjust the back plate to bring the jig up snug to your table saw fence. And that means clean, accurate tenons on any project, any time of year.
The best part about this jig is the simplicity in design and it's versatility in uses. With a few scraps of plywood or MDF, some off-the-shelf hardware, and a couple of hours, your tenon jig is ready to be put to use cutting tenons, making splined miters, or for other shop tasks.