Bobs Wood Shop

What you need to know about “Mortise & Tenons”

Place a bead of glue around the inside of the mortise just inside then use a small dowel to move the glue around the inside wall after the glue is spread around start applying glue to the tenor starting with the end grain then use your glue brush to cover the cheeks and sides of the tenor then fit it into the mortise. It’s important to use this method for two reasons one it keeps it neat and minimizes the chance of getting glue on the outer surfaces and number two it prevents the joint from future failure. Here’s the reason behind this theory, when you push the tenon in the glue is pushed to the bottom of the mortise and absorbed into the end grain pulling as much of the glue into the fibers as it can and thereby absorbing the glue that should be left behind to give strength to holding the cheeks so but applying glue to the end of the tenon the fibers get all the glue absorbed before it can be pulled from the sides of the tenon. Now comes the clamping, after the joint is closed all you need is ¼ to ½ turn on the clamp if you have to tighten it any more then that something’s not lined up correctly or the Mortise & Tenon is too tight. As a side note when edge gluing two board all you need is enough clamp pressure to make the boards touch so the seam is gone then all that’s needed is about ¼ to turn this should give you about 40 Pounds of pressure at the joint for a 4/4 board but when gluing thicker boards you need a little more clamping pressure so for 5/4 I like to see about 50 psi or ½ turn and 8/4 I go to 60 psi ¾ to on full turn.

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November 2, 2014 Posted by | What projects are in progress? | | Leave a comment

   

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