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ONEX #54 Web Site
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Date: 2-22-2013
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Number of Hours: 4.00
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Manual Reference: L01
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Brief Description: Updrill main gear
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Made some room in my garage shop and moved the forward fuselage out of the basement.
Made center marks on the fuselage and landing gear, L01-10. Using a tape measure, I determined the total length around the face of the gear and divided by two to determine the gear center. I started updrilling using this method, then wondered if the two sides were bent exactly the same. If not, the wheels would not be equal distance from the center using the tape measure method. The other method I've seen is to put a line across the ends of the gear, determine the center of the line, and project that line to be on the center of the fuselage. I used that method to check where I was using the tape measure method and the centers were less than 1/8" different. Seems the gear is pretty symetrical.
Aligned the gear on the fuselage and through drilled #40 from inside to "dimple" the main gear. Moved the main gear to the drill press and drilled the 10 holes on the main gear with #40 drill. Updrilled the center 6 holes to #30 on the drill press, clecoed the gear in place with the #40 outboard holes to keep things aligned. Through drilled the center 6 holes with #30. Repeated the process of moving the gear to the drill press to updrill, clecoe in place and through updrill to the fuselage, move to drill press and updrill, etc using #40, #12, 1/4 and finally 5/16 bits.
When the center six holes were done, used those to maintain alignment and used the same process to updrill the outboard holes.
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Transfer holes to "dimple" main gear
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Checking center alignment with string method
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Fore/aft alignment marks
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