The #30 holes common to the side skins and forward longerons are final drilled … I used a #30 reamer.
The holes common to F-01470-L Side Skin, F-01485-L Center Section Side Plate and F-01464-L Upper Drag Fitting are also final drilled #30, enlarging them from the previously drilled #40.
There are a LOT of longeron holes to be machined!
I made a block of wood with a slot for the countersink bit pilot, and then used the drill press.
Needed a nice cup of coffee after that lot : )
Then holes in the Center Section Side Plates are machined, being careful to follow the diagram detailing which holes to do!
Side Skin Dimples
I marked the side skins to ensure I left out the correct holes when dimpling …
… the DRDT2 made short work of the dimples …
… apart from the curved bottom flanges, for which I used the squeezer.
I also used a reduced diameter female set for the curved sections.
Some of the side ribs have the edges “broken”.
The Cleaveland Edge Forming Tool didn’t fit all the way along these ribs …
… so I resorted to the Hand Seamer for these spots.
There were a couple of spots on the side skins, on the curved bottom flanges, which had the same issue.