While making the bends for the front and rear center spar uprights, I had a problem trying to take measurements with any of the numerous protractors I had. The angles I was trying too measure were to acute for any of my protractors to fit. So I decided to make a set of simple angle gages.

The gages were made using .025 aluminum scraps that I had laying around. The key to setting up the angle is to use a machinist tool called a sine bar. Referring to the picture below, the sine…

Fabricating the front and rear uprights for the center spar posed an interesting challenge. Each is about 18 inches long. One has a thickness of .063 inches. Which if that were all I had to deal with, I could bend it in my regular leaf brake and be done one with. However the other pair is 1/8" thick and I think would be a little too much to bend for the leaf brake.

Fortunately I have a hydraulic press and also a 26" press brake to go along with it.The problem with the press…