Just like the title says. The upper case of the cupboard has a recessed portion; semi-hexagonal in shape. Its front stiles are pentagons. You can see one of them on the right-hand side of this photo (the cover of Trent’s anthology of Antiques Magazine articles from ages ago.)
Here’s how I fumbled around to plane them. I last did this sort of work about 2008 or so, and before that, 1998. So I tend to forget how in-between. It starts with this billet of oak, in this case, white oak. That chunk is maybe 4″ square, by 22″ long or so. The template on top of it is the shape I’m after, with the two front faces towards us.
After riving some excess off the back of it, I laid out the centerline and marked the cross-section on the end.
Then began hewing it to shape. This is to establish the rough shape.
I have a chalkline down the center and one on each edge guiding my hewing.
Then it comes in the shop to begin planing it at the bench. I have the piece shimmed so that the face I’m planing is pretty much level. This took some fumbling around (which you’ll see if you watch the video of this process) – that fumbling I attribute to that notion of doing this work only every ten or twelve years or so.
This is what I’m after at this point – two faces flat & straight, with the proper angle between them. Those faces are extra wide at this point.
So the next layout shows where I need to go back to the hewing hatchet. The faces I’ve penciled in there are 90-degrees to the original two faces I planed. The bottom surface doesn’t matter at all, and is left un-planed.
After hewing, it comes back to the bench for more shimming & planing. This next photo reminds me of “the piano has been drinking, not me.” The camera was tilted, not the bench. But I’ve shimmed the stile now between two pieces of 2″ x 2″ oak, one of which is held with a holdfast, the other with a handscrew. Then the stile slips between them.
and back to planing. next time these pieces make it to the blog, they’ll be propped in similar positions for mortising. But that will be a while. First, they need to dry some, & I need to build the lower case.
If you’d like to watch a video of me making one of these, here it is. It’s long, and shows the fumbling-around in mostly real time. But some of the concepts might be helpful if you’re ever in the position of planing weird shapes.