40 minutes and 4 more nose ribs tonight. I’ve got it down to 10 minutes per rib. I guess that means a total of 260 minutes to form all 26. Only 4 hrs and 10 minutes.
I worked at hammer forming the nose ribs today. I had tried the previously without much success. Today I tried again. The first rib had very small flutes and the flange was not very straight. I tried using my fluting plyers to straighten the flange resulting in marks on the flange. I don’t know if they will do any harm but I’d prefer not to use this rib. I also tried a flanging tool made with bearings for the lightening hole and this resulted in a rib that was even more bananna shaped. This rib will be scrapped. My second attempt was better but I still ended up with marks on the flange. I don’t plan to use the fluting plyers on the flange again other than for fluting. Today I enlarged the reliefs on the forming blocks and tried again. I used a 1/2" socket extension to hammer the flutes and then the fluting plyers on the flutes to help straighten the rib. This seems to work and I ended up with two good rib. I will scrap the first two but I only have to make one new one as I made an extra anyway.
Work progressed today on the nose ribs. They have all been deburred. I did this using a file and Scotch Brite pads. First I filed the edges to smooth them out. Next a chainsaw file was used in the tight radii to remove burrs. Finally, the Scotch Bright pad was used to remove any scratches along the edges left from the cutting process. This also helped to remove burrs from the edges. All of the parts were tested with my fingers to ensure no sharp edges remained. The next step was to stack all of the blanks and drill the tooling holes and the center hole for the fly cutter. The blanks were then unclamped and a large (1/2") drill bit was used to deburr these holes. I then setup the drill press for the 4" lightening hole with the fly cutter and began to cut these holes.
Today I finished cutting out the nose ribs. I completed all of the relief holes, marked up the -01,-02,-03, & -04 ribs and cut them out as well. I also started deburing.
I worked on the forming template for the nose rib. The template that I made in AutoCAD was glued to a piece of MDF. Next a second piece of MDF was cut out and clamped to the first one. I drilled the tooling holes and counter sunk them. The two pieces were then bolted together and the finished shape was cut on the bandsaw. I used the bench sander to finish the parts. Next I seperated the two pieces and used a router to put a round edge on one of the pieces. The band saw as set to 10 degrees and a fence installed. I then cut the forming block to provide a 10 degree relief to allow forming to the full 90 degrees. Finally, I transferred the flute positions from the plans to the forming block and then, using the drill press and a rasp bit, I cut the flute locations into the blocks.
Tonight I cutout the first rib (SNX-W15-05). I used a set of Andy Snips. These worked amazingly well. In the past I have use either left or right hand aviation snips and these would leave serations along the edges. This meant that I had to cut the blank a considerable amount oversize and then file it to size to remove the serations. The Andy Snips leave no serations to be cleaned up. A quick file and the cutout blank was ready to go. I drilled the two tooling holes and then setup my fly cutter. I am not happy with the pilot bit in the fly cutter. It seems to be off center slightly. I guess that’s what I get for buying the cutter at home depot. In anycase, the 3" lightening hole was easy to cut. I can now see why everyone else works in a batch mode. It makes sense to cut out the blanks then setup for the lightening holes and drill them all at once with the setup still in the drill. I plan to finish the current rib and then start working on a batch.