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12-12-2011, 09:52 PM
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Join Date: Jul 2011
Location: Norfolk, VA
Posts: 97
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Using an engraver
I just read a post about using an engraver to mark all the parts before priming so it will be readable after cleaning and priming. Isn't that a no no? I thought any scratches etc., could lead to stress cracks. Someone please hep me out here.
Bill
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12-12-2011, 11:09 PM
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Join Date: Dec 2005
Location: Oliver, B.C. Canada (Okanagan valley)
Posts: 786
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My understanding is that using an engraver is OK. Magnifying the engraving shows a line of small indentations...the surface is not being scratched.
Take a look at QB wings. The wing root spars are engraved at the factory. Engraving an identifying code to the parts to be primed is a good idea.
It is a little tricky tying to i-dent the parts after the stickers are off. 
__________________
Lorne
RV 7a tip-up
Pre-cover MD-RA Inspected.
Canopy completed. Bonded with Sika-Flex.
Up on her mains, Firewall Fwd and wiring on going.
Last edited by lorne green : 12-13-2011 at 04:20 AM.
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12-13-2011, 04:35 AM
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Join Date: Feb 2006
Location: East Texas
Posts: 192
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Bill
Welcome to the forums.
Not saying that the engraving method is wrong or right but that it is a lot of extra work when a sharpie works just fine. I used a black sharpie and the ID was readable through the primer. If it isn't, maybe a little too much primer was being applied. Try it out on a scratch piece.
Hope this helps.
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Marc Hudson
Houston
RV-7 Sold
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12-13-2011, 05:13 AM
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Join Date: May 2005
Location: Central Florida - Orlando Area
Posts: 58
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I agree with using the sharpie. It works very well for me, and I tend to use it liberally. If' I'm match drilling holes and get interrupted, I mark where I left off so I don't miss any holes. When disassembling after match drilling, I use it to mark where parts go to make re-assembly easier.
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12-13-2011, 06:08 AM
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Join Date: Dec 2006
Location: Collinsville, IL
Posts: 620
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Quote:
Originally Posted by 330Jock
I just read a post about using an engraver to mark all the parts before priming so it will be readable after cleaning and priming. Isn't that a no no? I thought any scratches etc., could lead to stress cracks. Someone please hep me out here.
Bill
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I am not close to my instructions to give you a reference, but Van's instructions does allow using a vibrating engraver.
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Don
VAF #1100, EAA864
-6A bought flying
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12-13-2011, 07:46 AM
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Join Date: Jan 2009
Location: Denver, CO
Posts: 590
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Quote:
Originally Posted by flytoboat
I am not close to my instructions to give you a reference, but Van's instructions does allow using a vibrating engraver.
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Agreed, Van's endorses it and the wing spars are engraved. I bought a cheap one from Harbor Freight and it works great, and frankly doesnt take any longer than using a sharpie since I keep it handy at the workbench. Personal preference...but its safe to do. And welcome!
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Ron Duren
Mechanical Engineer
"SportAir PhD"-RV Assembly/Composites/Electrical
Denver, CO (KBJC)
RV-7 'Tip Up'
Flying!! as of 3/16/14
IO-375/ WW 200G-CS/ SkyView/ Dual P-mags
N531R "Wablosa" Wings of Red
http://www.ronsrv7project.blogspot.com
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12-13-2011, 08:08 AM
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Join Date: Jul 2011
Location: Norfolk, VA
Posts: 97
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Thanks guys!
Bill
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12-13-2011, 12:58 PM
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Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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Also, a sharpie will *not* survive the clean/acid etch/alodine process. Which is more work than primer, but according to those who have done real world testing in a salt water bath, will provide the same protection as epoxy primer with effectively unmeasurable increase in weight.
Charlie
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12-13-2011, 01:09 PM
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Join Date: Mar 2007
Location: Denver, CO
Posts: 211
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Solvent wipes
Sharpie also will not survive a good solvent wipe, which should be done before primer is applied. Or you have to apply twice- once when first building/assembling the part, then again right after wiping clean prior to priming.
Dwight
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RV-10 #40762 - 100 hrs+
Denver, CO
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12-13-2011, 06:30 PM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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Small card tags on strings work, too. Like a Sharpie, you need to remove it for cleaning or priming. Unlike Sharpies or engraving, you remove them before final assembly. And unlike engraving, there's no chance of harming the part.
The collection of used tags is a reference to what is finally assembled.
The downsides to these are that they can infrequently fall off, or get mutilated, and once they are off, there's no indication that the part has any identification.
Pros and cons - but at least there is a third approach to the issue.
Dave
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