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Joinery Basics

Step 15Square Ends, Test Fit the Joint

Square Ends, Test Fit the Joint
For the best results, set the hole depth on your drill bit by attaching the collar that comes with the jig to the bit. The hole should be 1/16 in. deeper than the length of the tenon. This provides some space for excess glue that would otherwise keep the joint from closing completely. Once all the holes are bored, square the ends and the sides of the mortise with a chisel.

Finally, test fit the joint. The tenon should be snug in the mortise, but you shouldn't have to force the parts together. If the joint is too tight, carefully pare the tenon cheeks with a sharp chisel until the fit is correct. If you need to remove just a bit of stock, use sandpaper. Once you're satisfied with the fit, apply glue to all the mating surfaces, and slide the pieces together. Clamp the assembly securely until the glue has dried.
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1 comment
Jun 26, 2008. 7:46 AMwebman3802 says:
Very nice, step-by-step procedure. One thing I'd add is to make sure when gluing to clean up any excess glue with a damp cloth or paper towel before it dries. Sometimes even sanding the seam can show where the glue dried when you stain or finish.

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Author:Popular Mechanics
The official instructable for Popular Mechanics magazine, reporting on the DIY world since 1902.