I’m ready to carve the seat for my chair – one of the parts of the build that I’ve been looking forward to the most – but first, I need to get the legs fitted up. I start by reaming the holes to a 6° taper, using the tapered reamer that I built a few weeks ago. The tapered mortise make a stronger joint than a cylindrical mortise, plus it makes the chair easier to to assemble, so it’s the perfect joint for the leg-to-seat connection. I clamped the seat to my shavehorse so I could work on it at a comfortable height and give room for the reamer to poke through.
I set my bevel gauge to the desired angle, minus 3°. Since the angle of the reamer is 6°, cutting that number in half and sighting with the bevel gauge will result in the appropriate angle. Sight the angle every few turns. Once I have it nailed, I can keep reaming until the hole is tapered all the way through.
When the mortises are reamed, I can set my sight on the matching tenons: