While taking an online course, it was suggested that we use spacer blocks to cut the width of the tenons. The instructor gave us a reference to a magazine article that built a JIG across the Biesemeyer table saw rip fence. This is a wide fence.
My table saw has a narrow fence; therefore I decided to make my JIG with two cross members over my fence as shown in the embedded image below.
Tall Tenon Cutting JIG riding on my table saw’s Rip Fence.
(Note: this image is right-side up in my File explorer so I do not know why it is rotated a minus 90 degrees in Lumberjocks, nor do I know how to fix it.)
This JIG is 12 inches long and 8 inches tall, but it looks smaller than that in this photo. So it goes…
The idea is to make a spacer block that is placed in the JIG after the first cheek cut is made. The width of the space block is made so that the tenon width after the second cheek is cut will fit snuggly into the mortise. Typical width of my mortises made with hollow mortising chisels are: 1/4, 5/16, 3/8, 1/2 and 3/4 inches. For this rocking chair project I am making the mortises will be 3/8, 1/2 and 3/4 inches. My first spacer blocks will be made to fit these mortises.
Since I was making this JIG I was determined to also build a few other JIGs while I was at it. I needed a better way to store my table saw blades and a safer way to move sheet goods around in my shop.
-- --- Happy Howie