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  #11  
Old 01-24-2014, 02:51 PM
hayabusa hayabusa is offline
 
Join Date: Feb 2011
Location: Brisbane, Australia
Posts: 37
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Just for reference, Dimple countersinking the piano hinge material gently using a hand squeeze does not distort the material and ruin the hinge. I did this to all my piano hinges with the pin installed in the 2 hinge halves on the bench. You get a gentle curve over the length of hinge piece, but nothing that causes a problem. You can simply straighten it out and cleco it back into position for riveting.

If you tried to the same with a pneumatic squeezer set to close too tightly, I suspect it may cause an issue.

On my flaps, the skin, spar, and hinge are all dimpled and riveted together with no problem whatsoever.
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  #12  
Old 01-25-2014, 10:36 AM
instructor_bill instructor_bill is offline
 
Join Date: Jul 2009
Location: Petaluma, CA
Posts: 233
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Quote:
Originally Posted by hayabusa View Post
Just for reference, Dimple countersinking the piano hinge material gently using a hand squeeze does not distort the material and ruin the hinge. I did this to all my piano hinges with the pin installed in the 2 hinge halves on the bench. You get a gentle curve over the length of hinge piece, but nothing that causes a problem. You can simply straighten it out and cleco it back into position for riveting.

If you tried to the same with a pneumatic squeezer set to close too tightly, I suspect it may cause an issue.

On my flaps, the skin, spar, and hinge are all dimpled and riveted together with no problem whatsoever.
Good to know!
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Bill Mason

RV7 SB in construction
Avionics, Wiring, FWF, interior, and paint to go.
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  #13  
Old 01-26-2014, 08:40 AM
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aeroaddict aeroaddict is offline
 
Join Date: Apr 2013
Location: KEUL
Posts: 222
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Yesterday I machine countersunk (? grammar?) the first spar. Took my time to properly set up the depth on the countersink, and in the end the spar turned out nicely. The depth on the spar does leave a sharp edged hole but as noted, this will be the middle layer on the skin/spar/hinge assembly. Checked fit on the skin to spar and it sits real nice. Thanks for the words of wisdom.
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