Brief Description: Drilled Ribs and installed Grommets
1. I decided to make a jig to locate the grommet holes in the wing ribs. RANDS did not drill pilot holes which would have made things a lot easier. The jig is just a piece of angle. I cleco one flange to the top of the rib to be drilled and I drilled through the locator hole I drilled in the other angle flange. All holes are a #40 drill size. 2. The blue circles are the holes to use, the other holes are mistakes. Once I drilled the pilot holes in all the ribs I used a step drill to drill to final hloe size. I started by trying a 5/8" twist drill and it bit very hard into the thin ribs and left a star shaped hole. The step drill is much easier to control. RANS called for a 5/8" hole to acept the grommets. I drilled a 9/16" and then pulled a SHAVIN tool around the ID several rounds and the grommets fit very nicely. A Full 5/8" hole leaves the grommet a little free to spin in the hole. 3. I installed the edge protector around the hole in Rib #2 and I think this needs to be glued. I will ask tomorrow when I call RANS about wire size for the wing lights plus the pitot tubing. Neithor are included in the kit.
