This post won’t be quite as long as the last, because frankly, the best instructions available for making a simple rounding plane are already on the internet. Just head over to Tim Manney’s blog and you’ll have one up and running in an hour or two (He calls it a tenon cutter – same thing).
I couldn’t help taking a few photos, though, just to prove that his process actually works. I briefly considered using more osage-orange to make a rounding plane that matches my reamer. But this process requires accurate planing, drilling, sawing, and reaming, so I decided a milder wood was in order. I dimensioned a 12″ length of cherry to 2 1/8″ (the width of my blade) by 3″ (enough width to clamp in my vice, but otherwise arbitrary).
I bored in a 5/8″ hole (since this will be the top diameter of the leg holes in my Windsor chair seats) about 3/8″ from the edge of the blank, and used my tapered reamer to cut the taper.
Last step: Treat your apprentices to a walk in the woods and a Thermos full of hot chocolate.