Date:	4-22-2018
Number of Hours:	4.00
Brief Description:	Deburring and drilling the rear spar
The rear spar is 0.063 in. thick and has pretty rough edges from the stamping process. Because the spar is 9.5 ft long I didn't think I could use the ScotchBright wheel on my grinder and control it well so I clamped it to the workbench and started smoothing the edges with a vixen file. Once the edge surfaces were sufficiently smoothed I used a crowfoot deburring tool to remove the corner burrs formed by the filing. I kept making more work for myself because the tool would sometimes slip off the edge and gouge the web. Grrrr! I hate sanding out scratches and gouges, but it has to be done or you pay for it big time later when the crack forms. A final pass with a 1 in. ScotchBright wheel on my electric drill to smooth the edges was done. I started on deburring the lightening holes in the same manner as the edges, but I stopped after four holes because my hands were aching pretty badly. Two holes in the center of the spar were countersunk without problems. I started sanding some of the self-inflicted scratches out of the web. The HS-912 brackets were all final drilled and their locations marked. The HS-906 doubler was clekoed to the spar and the common holes were all final or match drilled as required. I wish I could've continued, but my hands and shoulders were screaming at me to stop.