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10-13-2012, 09:49 AM
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Join Date: Jul 2012
Location: San Antonio, TX
Posts: 120
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To deburr, or not to deburr
I'm working on my tail unit, and am currently at one of the burr and edge stages.
My question is this.
The plans say to edge and 'deburr all'. I assume this includes rivet holes as I was taught on the RV Assembly course. But unless I am mis-reading/understanding my mechanics manual, it suggests not to burr holes that are going to be dimpled, such as rivet holes. My instinct is to deburr the rivet holes.
Thoughts?
Opps just noticed title should've been 'To deburr, or not to deburr'
__________________
Roger
A Brit in Texas
RV8 N886LH (Reserved) BuNo 83320
Collecting books/info/tools.
Tail kit arrived! 9/30/2012
Construction started
"The engine's overheating, and so am I! Either we stand down, or blow up! Now which do you want?" Sqn Ldr Canfield.
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10-13-2012, 10:24 AM
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Join Date: Nov 2005
Posts: 1,256
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Deburr everything...rivet holes, tooling holes, lightening holes, edges, notches, flanges...
In fact, a hole that is going to be dimpled is going to be stretched, which I would think would *increase* the risk of a crack if not properly deburred.
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Steve "Flying Scotsman"
Santa Clarita, CA
PP-ASEL, ASES, Instrument Airplane
RV-7A N660WS flying!
#8,000
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10-13-2012, 10:31 AM
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Join Date: Feb 2009
Location: Southbridge,MA
Posts: 193
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I read the very same thing back a few years ago when I started but deburred everything anyway. I never got an explanation on why it said that. 
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Steve Stella
#40654 Finishing
N521RV reserved
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10-13-2012, 10:34 AM
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Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 2,645
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Use a reamer for the drilled holes and save a bunch of time.
http://www.cleavelandtool.com/prodinfo.asp?number=RSF40
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rockwoodrv9a
Williamston MI
O-320 D2A
Awaiting DAR Inspection
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10-13-2012, 11:45 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Make note that deburring is NOT countersinking.
The max depth should be 10% of the metal thickness...
3.3.1 here - http://mybearhawk.com/MIL-R-47196A_MI.pdf
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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10-13-2012, 12:03 PM
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Join Date: Aug 2012
Location: Dallas, TX
Posts: 33
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The deburring reduces the risk of cracking, particularly fatigue related cracks originating at stress risers. Best practice is to only dimple cleaned, deburred holes, since doing otherwise could embed bits of burr into the surrounding metal.
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John
N994 reserved for an RV-8A
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10-13-2012, 12:43 PM
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Join Date: Jun 2007
Location: palm coast fl.
Posts: 945
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Deburr
I keep an assortment of drill bits , long short and different diameters on the work bench for deburing holes . Wrap some masking tape around the bits so they are easy to grip without wearing out your fingers . Deburing tools with a swivel blade is great for the lightening size hole or any hole larger than a half inch. I debur everything completely smooth ,it's part of my therapy.
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10-14-2012, 07:05 AM
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Join Date: Jul 2012
Location: San Antonio, TX
Posts: 120
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Thanks everyone
I'll deburr.
Thanks for the reamers idea Rockwoodrv9, I'll have a look at them.
Thanks az_gila for the link
And thanks to the whomever for correcting the title.
__________________
Roger
A Brit in Texas
RV8 N886LH (Reserved) BuNo 83320
Collecting books/info/tools.
Tail kit arrived! 9/30/2012
Construction started
"The engine's overheating, and so am I! Either we stand down, or blow up! Now which do you want?" Sqn Ldr Canfield.
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10-14-2012, 08:48 PM
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Join Date: Jan 2007
Location: Mount Vernon, IN
Posts: 1,270
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My cousin used to work for one of the giant aerospace companies making helicopters for the military. He claims that all they did was use a chip chaser to remove the debris from the drilled sheet and then riveted them together. No deburring at all.
I didn't specifically ask him about CS or dimpled parts.
I suspect that very few spam cans ever saw a deburring operation, but I could be way off. Anyone care to chime in?
Van's mentions somewhere that a Roloc disc works well and is very fast. However, if you're gonna polish the plane, don't use it on the outside!
__________________
Vince Frazier
www.f1aircraft.com
F1 Rocket and F4 Raider components
1-888-F1AIRCRAFT (1-888-312-4727)
www.flyboyaccessories.com
RV and Rocket Accessories, Tailwheels, Tools, & More
1-888-8FLYBOY (1-888-835-9269)
F4 Raider - under construction
F1-H Rocket "Crazy Horse" - sold
RV-4 "Chief Pontiac" - sold in 1994, purchased in 2018
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10-15-2012, 10:02 AM
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Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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Quote:
Originally Posted by rockwoodrv9
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I too use reamers on pre-punched holes in assembly to acheive the final hole diameter, but I've found that doesn't negate the need for deburriing. Even reamers leave a bit of a burr, especially on the inside. One turn with a deburring bit on a speed handle usually does the trick. I only wish edges were so easy...
__________________
Miles (VAF# 1238, Paid up as of 2018)
RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site
Construction Log
Picasa: Empennage Album, Wings Album, Fuselage Album
1955 Cessna 170B flying since 1982
'To get something you never had, you have to do something you never did.' -Unk.
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