I’m building a shaker trestle table, that was featured in popular woodworking. One of the mortise/tenon joints connecting the leg to the foot is a little loose. It fails the friction test, but just barely. How loose can it be before I should consider shimming the tenon?
What kind of wood? Remember that most glue is water based and will swell the wood slightly when the joint is glued together, soft woods more so. If you have a slight friction fit I’ll bet it will be just fine when glued. You also could add wedges so that when the joint is seated the wedges lock the joint.
Remember the tenon will swell a little with the glue. If you were going to draw boar the joint it would be fine. Just speaking for my self, I like a nice friction fit, so I would probably still shim it anyway.
I recently shimmed a couple of tenons for my first frame and panel. I glued on a thin piece of wood on each side, trimmed with a chisel then used the router plane on both sides to get back down to the correct depth. Not ideal, but it worked very well and will not be seen. For my next frame, you can sure bet that I will cut those tenons fatter. 😉