Hello

[Craig Regan]

I am building from a Peter Chandler plan. His graduation pattern for the top plate has a thick 8 mm center "spine" running top to bottom. Here are some ideas for different patterns, for thinning the top.

The first is a simple peanut type shape. Starts off thick in the middle and gradually thins at the edges. Seems simple and straight forward.

The second is based on a cello pattern. Ovals in the center, thinned out in the upper and lower bouts or "lungs" as they are sometimes referred to in this sort of pattern. Good pattern for cellos and violins but unsure with double basses.

What is the accepted "normal" patterns used by manufacturers past and present?

Would the tea leaf and audio oscillator set up help out in this situation?

The further I go on this project - the less I know.
If anyone wants to chime in on graduating top plates, the forum is open.