Third day of working on wing Ribs. Lots of deburring and fluting. Below you can see a completed wing rib with the flutes in the flange. These are done to effectively shorten the flange and pull the rib straight. It gets warped by the manufacturing process and this is the method to straighten it.
Additionally, every edge has to be deburred which consists of running either a deburring tool, or a grinding wheel over the edge and then polishing it with a polishing pad. This includes the insides of the lightening holes. 20 completed, 8 to go.