With the eight mortices cut and squared away, it’s now time to sort out the tenons on the two other rails. They’re going to be exposed and rounded which means that the first shoulder line from the end on each piece needs to be at least 4mm longer than the thickness of the outside rails…say 24mm. It’s often tempting to use a rule (which seems the logical choice) to measure a distance for the second shoulder line, but if it’s done like this, the rule will produce its own inaccuracies so it’s always more effective to measure from the actual job.
The framework was assembled and pulled up ‘righty tighty’ with a Bessey Band Cramp and the two rails placed across it.
The first shoulder line (arrowed) was lined up with a square on the inside of framework, so that the second shoulder line could be struck with a ‘V’ point marking knife.
I made the one shown in the pic, but we sell a Japanese version which will do exactly the same job.
With the shoulder lines knifed all the way round and big numbers to show which joint is which, the actual tenons can now be marked off from the mortices with the ‘V’ point marking knife. From the knife marks, simply use a small square to transfer them across the end grain and down to the shoulder line and then mark in the waste, writ big, with a dark pencil.
On more than one occasion, especially when cutting dovetails, usually at the end of the day, I’ve forgotten to do this simple bit and you don’t need to be Stephen Hawking to work out that I cut the things on the wrong side of the line. This is another good reason to never, ever, ever cut dovetails at the end of the day.
Cutting the tenons is the work of moments, especially if you have a decent bandsaw with a nice sharp blade. I’ve done them plenty of times in the past by hand, but the bandsaw was made for this sort of job.
However, get the fence set-up just a teensy, weensy bit out and you’ll find that the joint, instead of being ‘righty tighty’ is a bit ‘loosey lefty’ and will need a shim glued back on (arrowed) which is afterwards pared to fit. If the shim is chosen from the same stock as the rest of the table, it’ll be completely invisible when it’s finished. I’ll know it’s there, but you’ll have to don a deerstalker and hunt for it with a magnifying glass.