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09-10-2017, 09:14 PM
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Join Date: Jul 2014
Location: Whistler BC
Posts: 207
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Machine countersink depth question
Hello all.
I'll cut right to it.
.32 E702 Spar
4 AD426 rivets to the E705 root rib
When counter sinking the spar as per the directions in section 5 of the manual I am not able to get the rivet to sit flush without the hole being enlarged. Will this rivet squish in after setting? I don't want to go any deeper and cost me a spar see pictures.
Thoughts?
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Andrew Atalla
Red Seal Automotive Service Technician
Red Seal Heavy Duty Equipment Service Technician
Welder/Fabricator
Squamish BC CYSE
RV-7 Left Elevator in progress
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09-10-2017, 09:20 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,767
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You need to go deeper. Set your countersink cage practicing on scrap.
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09-10-2017, 09:24 PM
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Join Date: Jul 2014
Location: Whistler BC
Posts: 207
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Quote:
Originally Posted by BobTurner
You need to go deeper. Set your countersink cage practicing on scrap.
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I agree but as you can see I'm about to enlarge the hole?
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Andrew Atalla
Red Seal Automotive Service Technician
Red Seal Heavy Duty Equipment Service Technician
Welder/Fabricator
Squamish BC CYSE
RV-7 Left Elevator in progress
Dues paid
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09-10-2017, 09:28 PM
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Join Date: Jan 2016
Location: Southwest
Posts: 1,109
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Rivets
In my experience, rivet heads will not smush down. If the machine head is proud to start, it will end up proud after riveting.
__________________
John S
WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.
Dues paid 2020, worth every penny
RV9A- Status:
Tail 98% done
Wings 98% done
Fuselage Kit 98% done
Finishing Kit 35% canopy done for now
Electrical 5% in work
Firewall Forward 5% in work
www.pilotjohnsrv9.blogspot.com
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09-10-2017, 09:45 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,767
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I see you work in the automotive industry. Are you sure your countersink is an aircraft one, not an automotive one? Different angles.
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09-10-2017, 10:42 PM
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Join Date: Nov 2012
Location: Launceston, Tasmania, Australia
Posts: 774
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If you end up with a slightly proud factory head, you can always shave them down with a rivet shaver bit in your countersink cutter cage driven by your trusty 1800rpm drill (the fancy 20,000+ RPM pneumatic shavers are not necessary).
Tom.
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09-10-2017, 11:01 PM
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Join Date: Dec 2014
Location: Just Minutes from KBVI!
Posts: 1,034
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If you are concerned about the csink moving around, make a backing plate from a piece of thick aluminum or hardwood and clamp it in place. Match drill to the pilot size and then countersink. Reuse the backer until it wears too much.
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09-11-2017, 03:47 AM
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Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 992
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032 should be dimpled ?
I may be wrong, but recall Vans instructions say don't CS on less than 040 for this reason.
__________________
Larry DeCamp
RV-3B flying w/7:1 0320 / carb / Pmags / Catto 3b / digital steam
RV-4 fastback w/ Superior roller 360/AFP/G3X/CPI/Catto3b
Clinton, IN
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09-11-2017, 07:56 AM
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Join Date: Jul 2014
Location: Whistler BC
Posts: 207
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Quote:
Originally Posted by BobTurner
I see you work in the automotive industry. Are you sure your countersink is an aircraft one, not an automotive one? Different angles.
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I am using the 100 degree '0' flute cutter from Cleaveland tool.
__________________
Andrew Atalla
Red Seal Automotive Service Technician
Red Seal Heavy Duty Equipment Service Technician
Welder/Fabricator
Squamish BC CYSE
RV-7 Left Elevator in progress
Dues paid
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09-11-2017, 09:02 AM
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Join Date: Jan 2006
Location: Vonore, TN
Posts: 368
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If this is an RV-7 I think you should be dimple countersinking the HS spar, not machine countersinking.
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John Tierney
Vonore, TN
RV-7A - N777JT Flying
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