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Nate's RV-7 Site
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Date: 1-30-2019
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Number of Hours: 1.50
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Manual Reference: Sect 6-9
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Brief Description: Left Elevator Work, Cont...
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-In this log entry I completed assembly of the left Elevator, and installed of the left elevator control horn to the structure. The toughtes part about this was fitting the elevator counter balance weight to the elevator counter balance structure. This was definently easier said than done. To accomplish this I installed the elevator counter balance, and marked the two holes by starting the drill through the holes in the couter balance tab. Then, I attached the counterbalance weight, counterbalance rib (E-703), End Rib (E-704), and the Counterbalance Skin (E-713), and attached the assembly vertically to the workbench with a clamp, and attempted to drill through it with my pneumatic drill. The difficulty was accomplishing this was three-fold. First lead does not like heat, and as the drill bit ground its way through heat would build up between the lead weight and the high strength steel brill bit, causing them to bind. To counter this I liberally used Boelube (a proprietary drill lubricant made by Boeing) to keep the heat down, and stop the brill bit getting stuck. Secondly the drill bit cut at an agressive rate, so I had to modulate the speed and pressure applied to the drill to slowly grind my way through the counterweight rather than let the drill cut at its own rate. Third, and finally, I had to drill carefully to make sure that the drill would go through the weight and structure at a 90 degree angle. Allowing the drill to drift +/- this angle could possibly place me in a position where the resulting hole in the attachment ribs would not be properly through the flange. Thus while drilling through the counterweight, I was very nervous about the results of my drilling, until I the drill bit carried through the counterweight and made a second hole in the couterbalance rib (E-703). Once I found that the drill made a hole dead through the center of the rudder counterbalance rib flange (E-703) I was able to relax and breathe again. Thus completing my work on the Left Elevator structure.
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