Having completed the mortices, the next job is to cut the corresponding tenons.
The rails are a bit big to be held in place just by a little toggle clamp, so I used a couple of trigger clamps to be on the secure side.
The tenons need to be longer than my saw can manage, so there is a bit of hand work to do.
The jig automatically takes into account the thickness of the kerf of the blade. The result is a perfect tenon that doesn't need any fettling. This is the centre rail, leaving a 12mm setback for the T&G cladding. There is 0.15mm difference in setback on each side
For the twin tenons there are four cuts that need to be made in exactly the right place. The first is made with the jig closed
The spacer fits my mortice exactly, so too will the first tenon
Remember that spacer I used when cutting the twin mortices? Well I use the same spacer to move the top carriage over by exactly the same amount, in order to cut the second tenon
Again the tenons need to be lengthened, so the waste between the them is bandsawn out and cleaned out with a chisel, but the end result is this:
Now is that good or is that good?
Five joints down, seven to go.