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  #1  
Old 01-21-2019, 08:17 PM
rnewcomb7797 rnewcomb7797 is offline
 
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Default elevator fairing countersinking

I need to countersink the elevator fairing tips. Any recommendations on how to keep the countersink cage flush with the fairing since there is that slight flange just to the side of the hole?
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  #2  
Old 01-21-2019, 11:22 PM
lr172 lr172 is offline
 
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Eirther free hand it or make a plate from .125 and drill a 1/2" or 5/8" hole in it. Space the hole edge to piece edge to accomodate you joggle. 063 migth be enough depending upon the joggle height.

learning to free hand a countersink is an important skill. Its not that hard.

Larry
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  #3  
Old 01-22-2019, 04:34 AM
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mulde35d mulde35d is online now
 
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Default Countersink

+1 for what Larry said about free hand countersinking. I used a 100 degree deburr bit to countersink all my fiberglass. Rather easy once you get the sequence down.
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  #4  
Old 01-22-2019, 08:14 AM
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kiljoy kiljoy is offline
 
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I did mine by hand as the force of pushing the countersink cage down on mine was bending the fiberglass. I wound up using my drill with countersink bit while using two fingers on either side from the bottom to support the fiberglass.
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  #5  
Old 01-22-2019, 02:06 PM
MED MED is online now
 
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As an alternative to using a drill, I put my bare countersink bit in my electric screwdriver. The slow speed made it very easy to control depth.
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  #6  
Old 01-22-2019, 05:22 PM
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az_gila az_gila is offline
 
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I like doing it freehand as others have mentioned, but with the countersink in an extension. It's easier to handle...

https://www.aircraftspruce.com/catal...llThreaded.php
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  #7  
Old 01-22-2019, 06:59 PM
Breezy Breezy is offline
 
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Location: Okeana, Ohio
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Ron,
The quick way is to free hand the countersink. Use a scrap and practice, the bits can grab with little pressure so get a feel for it. A sharp bit requires very little pressure. Use a very low speed on fiberglass.
I often free hand in aluminum as well if only needing to do one or two holes.
A ready extension for threaded bits is a cable turnbuckle center. The clockwise end is a match to the bit threads, also drill bits. If you have the equipment lathe the unused end for easier chucking to a drill.
Good luck!
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