I was about to get started on a new building project (more on that later) and pulled out my balsa building board. It’s been a while since I last used it, and much to my dismay, I discovered that it had taken on a bit of warp. The mid section of the board had taken on a crown of about 1/32” – 1/16” relative to the ends.
My first attempt to flatten the board was to clamp and weight it down to my bench. This worked and between the clamps, weights, and few paper shims, I was able to get the board to within about 0.010” of flat. Not pretty, but this could work. Then I discovered that the clamp was blocking my bench drawer from opening … oops!
I really wanted a more permanent and less awkward solution anyway. After a bit of searching, I found this post on RC Universe. Eureka, I can do that too!
A trip to my local big box store yielded some 1” square aluminum, corner brackets, and assorted screws. A few hours later, I had the the following:
I am back to being within about 0.010” of flat (measured with a straight edge and feeler gauge). Good enough!
I still want to build a true torsion box table one of these days and have a truly dead flat surface, but this should give me a very flat and stable surface.
On to my next building project!