Ever wonder how furniture builders cut joinery on curved parts? A common place to see this is on chair backrests, especially large rocking chairs or Morris Chairs with adjustable backrests. The most common technique is to start with thick 8/4 stock and form the tenons before cutting the curved shape. This usually involves cutting offset tenons on the thick stock so the resulting tenon is reasonably centered after cutting the part to the final size. As long as thick stock is available, you can make nicely curved backrest parts this way.
When recently examining an Eastwood chair at an antique shop, I realized the backrest rails were deeply curved. This particular chair would require 12/4 stock to make the curved rails in the typical
