NorthernRV4
Well Known Member
Today started really badly. I am at the point of building my left fuel tank where I'm drilling the attach screw holes from #30 to #21 so I can prepare for dimpling. To my horror three of the inboard most holes of the aft line of #8 screws nicked the spar bar. I know this is BAD but just how bad? I'm sure tech support will have nothing definite or good to say about this. As best as I can measure the depth of the nick, the worst is about 0.001" - 0.002" at the very most.
Two questions that I need advice on
1. Has anyone encountered this same scenario? Is there a reasonable fix? I can certainly smooth the nick out to remove any stress concentrations. Yes this will reduce the strength of the spar to some unknown degree but it seems rather tiny.
2. Since there is NO room for a dimple I think machine countersinking is the only option with a K3000 corner type nut or possibly another style.
Untitled by James Soutar, on Flickr
Untitled by James Soutar, on Flickr
Two questions that I need advice on
1. Has anyone encountered this same scenario? Is there a reasonable fix? I can certainly smooth the nick out to remove any stress concentrations. Yes this will reduce the strength of the spar to some unknown degree but it seems rather tiny.
2. Since there is NO room for a dimple I think machine countersinking is the only option with a K3000 corner type nut or possibly another style.
Untitled by James Soutar, on Flickr
Untitled by James Soutar, on Flickr
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