This blog will show how I make a 12” bowl blank from 1 BF of lumber.
Cut a 12”x12”x3/4” square and draw an X from corner to corner to find the middle.
Using a compass draw a circle in the middle of the board the size you want the bottom of the bowl to be. In this case around 4”.
Draw concentric circles spaced the thickness of the board (in this case 3/4”)
Drill 1/8” holes at 45 degrees on the 4 inner circles to insert a scroll saw blade into later.
Cut the outer circle at 90 degrees on the BS or scroll saw
Tilt the Scroll saw table to 45 degrees. Take the top of the scroll saw blade loose and slide the blade through the hole and reattach the top of the blade. Cut the first ring free. Repeat for the other rings.
Glue and stack the rings together and weight it down until the glue dries. ( I have since built a simple bowl press but weight will work fine)
I only have a face plate that must be screwed on so I glued a piece of paper between the bowl and a sacrificial wood disc that will receive the screws. When the turning is done just tap a chisel into the joint and the paper will tear in two. Then just sand the paper/glue off.
And the last step is the most fun. All you have to do is turn the pilot holes out , sand, and finish.
-- Scott Smith, Southern Illinois