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  #11  
Old 01-15-2019, 10:39 PM
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wjb wjb is offline
 
Join Date: Nov 2012
Location: Half Moon Bay, CA
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I've been hand drilling the countersinks in my cowl using some carbide-burr countersink bits with great results. Go slow, and check often. All have come out just right.
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N430WB RV-7 #74152, tip-up. Running out of garage projects ... waiting for the hangar (any day now!)
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  #12  
Old 01-16-2019, 11:23 AM
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bk1bennett bk1bennett is offline
 
Join Date: Nov 2015
Location: Sachse, TX
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I used a drill press and my calibrated eyeball.
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  #13  
Old 01-16-2019, 05:05 PM
RV10Pilot RV10Pilot is offline
 
Join Date: Jan 2005
Location: Medford, NJ USA
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How about something like this
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  #14  
Old 01-16-2019, 05:34 PM
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Join Date: Jun 2005
Location: Cedar Park, TX
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Yep. I call it kamikaze counter sinking or dimpling. Free hand can liberate you from the cage . Just be darn sure you can meet your quality assurance expectations before ruining a part. The other such operation is a dimple die in the rivet gun and it's companion in a backing buck. Do you feel lucky? <smily face fully implied!>

Once you get over the pressures, angles, and all the ways this could go wrong, you'll be moving right along without so much jig analysis. I know a Boeing production engineer would be squirming in his seat, but we aren't build a space shuttle here.
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  #15  
Old 01-16-2019, 07:13 PM
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ColoCardinal ColoCardinal is offline
 
Join Date: May 2010
Location: Morrison, CO
Posts: 370
Default countersink

. . or you could replace them with an internal stop: https://www.flyboyaccessories.com/In...top-p/2102.htm
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  #16  
Old 01-17-2019, 12:00 AM
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Join Date: Feb 2006
Location: Stockholm, Sweden
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I have had great success using the cutter without cage in a small battery powered screwdriver. Easiet than going full manual as I can focus on keeping the angle right while the machine works at a slow seady pace.
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  #17  
Old 01-19-2019, 02:56 PM
RonS RonS is offline
 
Join Date: Nov 2018
Location: Roswell, GA
Posts: 12
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Hit this same issue last week. I picked up a paint cutter arbor from Spruce which is threaded to accept my CS cutter and mounted it in the drill press. https://www.aircraftspruce.com/catal...utterarbor.php

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