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RV-7 Construction Log
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Date:  9-21-2012
Number of Hours:  0.50
Manual Reference:  
Brief Description:  #8 Countersunk Screw Hole Finder

I wanted to go ahead and install the nutplates for the wing root fairings while building the wings. In case the fairings are not pre-drilled, I wanted to be sure I could locate the holes accurately. I built a hole finder out of 0.016 aluminum with the bottom hole drilled to #19 and dimpled to #8 screw size. The top hole is drilled #40 and concentric with the dimpled bottom hole. I added a "handle" made from some left over stiffener stock.
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Dimpled hole in bottom sheet.

Dimpled hole in bottom sheet.

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Concentric #40 hole in top sheet for locating pilot hole in a fairing or cover.

Concentric #40 hole in top sheet for locating pilot hole in a fairing or cover.

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