georgemohr
Well Known Member
Hi team 14!
Please check me. I'm getting ready to countersink the spar for the center screw holes in the fuel tank and access panel nutplates. I created a test sample to try and get the depth of this countersink right using some rather thick bar stock and a K1000-06 nutplate.
I'm aware of the .007 rule for countersinking below a skin dimple for rivets but less clear about the approach for this special case. The instructions offer that for the #6 nutplate the max outer diameter of the dimple should be 7.8mm and the max inner should be 4mm.
On my test sample I snuck up on about 7.5mm OD and test fit a piece of scrap skin with a #6 dimple applied to it. The result is attached. I think the skin to spar gap is something like .008 on average all around (I can't quite get a .010 feeler gauge into the gap). Pls ignore the oversqueezed rivets, this bar stock is thicker than the real spar.
What do you all think. Am I on the right track here?
THE SPAR LIFE YOU SAVE MIGHT BE MINE
Thanks,
G
Please check me. I'm getting ready to countersink the spar for the center screw holes in the fuel tank and access panel nutplates. I created a test sample to try and get the depth of this countersink right using some rather thick bar stock and a K1000-06 nutplate.
I'm aware of the .007 rule for countersinking below a skin dimple for rivets but less clear about the approach for this special case. The instructions offer that for the #6 nutplate the max outer diameter of the dimple should be 7.8mm and the max inner should be 4mm.
On my test sample I snuck up on about 7.5mm OD and test fit a piece of scrap skin with a #6 dimple applied to it. The result is attached. I think the skin to spar gap is something like .008 on average all around (I can't quite get a .010 feeler gauge into the gap). Pls ignore the oversqueezed rivets, this bar stock is thicker than the real spar.
What do you all think. Am I on the right track here?
THE SPAR LIFE YOU SAVE MIGHT BE MINE
Thanks,
G
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