Sunday, January 29, 2017

Reaming wing bolt

When trying to mount the pin lock handle, I run into problems again. The pin just wouldn't enter, and I couldn't understand why. After lots of filing and adjusting, it suddenly became apparent why.

The holes didn't line up. It is obvious the upper hole in the handle should be made after the pin hole is made. Drilled up the hole to 5 mm from 3/16 (4.8 mm). I also widened the lower hole a bit. Then, finally I could operate the handle, and the pin.

Riveted on the rib and drilled and reamed the upper hole for the bolt. It looks like a really good fit. The wing cannot be moved a mm with the bolt and the pin in place. I will do the same for the other wing before drilling/reaming the aft pin hole. That will be the only leverage I have to do fine adjustments in case the wings are a bit twisted. With both of them on using the pin/bolt in the main spar, the aft hole can be adjusted 2 mm up or down. I have no idea how straight they are, I have found no way to measure them without mounting them on the fuselage. Most probable they are perfectly straight due to the laser cut holes from the factory. But then again there have been more than enough errors with these holes...

In addition to the adjustable reamer and the drill doctor, there is one additional tool that makes the whole thing much easier (have no idea what it is called in English):

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