Lay Out a D-shaped Seat

One of many basic shapes for the seats of chairs or stools is
the D form. For those who make or respect Welsh chairs (like I
do), it’s a form you see loads. But many starting chairmakers
fret over making a D-shaped seat of their very own dimensions.

I admit that once I began making chairs, I used to be equally
befuddled and most well-liked to hint the shapes of previous seats or
work from patterns drawn by different chairmakers.

That’s as a result of the seat’s geometry eluded me. Was it a real
ellipse? A false ellipse? One thing else mathematical?

As with most issues in woodworking, the reply was extremely
easy: It’s a half-circle married to a rectangle. Right here’s how
to put it out.

Most fashionable chairs (for contemporary bottoms) are about 19” to 20”
large on common. The depth will be wherever from 14” to 16” or
even 17”.

So that you begin with the width of the seat. It’s 20” so the
half-circle portion of the seat has a radius of 10”. Set your
trammel factors to 10”.

A easy half-circle seat isn’t deep sufficient – 10” on this case.
Your butt would slip off it. So you’ll want to make it deeper.
Once more, begin with the width of the seat (20”) and that’s the
width of your rectangle. The depth of the rectangle is a few
quantity that may get you someplace affordable for the American
posterior. On this case I made a decision the seat as an entire ought to be
15-1/2” deep so I made my rectangle 5-1/2” deep.

So I laid out a 5-1/2” x 20” rectangle on my seat inventory. I
discovered the middle of one of many 20” segments. I put a trammel
level on that centerpoint and drew the half-circle for the again
of the D. Performed.

— Christopher Schwarz

Editor’s be aware: Wish to be taught extra about chairmaking? Verify
out these two movies:

,” by Christopher Schwarz and “Build
a Welsh Stick Chair
,” by Don Weber.

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