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11-04-2008, 08:08 AM
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Join Date: Jul 2008
Location: La Crescent
Posts: 11
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main spar machine countersink
I'm working on the out board bottom skins of a 9 QB wing.
I want to machine countersink the main spar flange. The LE skin is already riveted on. How do you keep the Countersink cage square against the spar flange with the LE skin in the way?
Thanks
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11-04-2008, 08:25 AM
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Join Date: Jun 2005
Location: Milwaukee, WI area
Posts: 2,967
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Either "suicide" with no cage, or a much safer half cage is what you need...
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Chad Jensen
Astronics AES, Vertical Power
RV-7, 5 yr build, flew it 68 hours, sold it, miss it.
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11-04-2008, 08:27 AM
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Join Date: Jan 2005
Location: 54t - Texas
Posts: 212
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Jeff,
I you will have to either find or make a countersink cage with part of the foot removed.
I don't know if I have any extras or not.
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Steve Monigal
81604 Fuse (SOLD)
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11-04-2008, 08:39 AM
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Join Date: Apr 2005
Location: KSLC
Posts: 4,021
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How about a small piece of aluminum, the thickness of the installed skin, with a hole cut in it, to allow the cage to sit on top. Then just butt this up to the installed skin & set the depth deeper.
L.Adamson -- RV6A
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11-04-2008, 08:41 AM
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Join Date: Jan 2005
Location: 54t - Texas
Posts: 212
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Check your PM (Private Messages)
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Steve Monigal
81604 Fuse (SOLD)
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11-04-2008, 10:05 AM
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Join Date: Jul 2008
Location: La Crescent
Posts: 11
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Thanks for the ideas.
Jeff
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11-04-2008, 10:12 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,122
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Quote:
Originally Posted by L.Adamson
How about a small piece of aluminum, the thickness of the installed skin, with a hole cut in it, to allow the cage to sit on top. Then just butt this up to the installed skin & set the depth deeper.
L.Adamson -- RV6A
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That would be my vote, right there.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now. 
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