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Old 01-22-2022, 10:20 PM
Everwild Everwild is offline
Join Date: Feb 2020
Location: Maumee
Posts: 106

Originally Posted by rapid_ascent View Post
You need to have a backup piece of some sort because the pilot of the countersink bit needs to be supported in some way.
I built this jig for the center 9 + 9 holes that you have to countersink into the flanges and caps of the HS front spar on a -10.

This worked really well to support the countersink cage along the edge. There's a spar cap there so elongating the hole wasn't a concern, but seems this approach could make countersinking flanges in other areas a little less hit or miss and would provide a pilot behind thiner material too.

Definitely some extra time clecoing from hole to hole but it worked. Eventually only used 2 clecos for each set up and it stayed put.

(Ignore the extra holes. They don't do anything. This was scrap from a botched doubler )
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David Woodward
Holland, Ohio
Working on wings
2022 Dues Paid

Photos of build progress here.

Last edited by Everwild : 01-22-2022 at 10:26 PM.
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