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  #1  
Old 04-17-2018, 09:59 AM
JwWright57 JwWright57 is offline
 
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Default Deburring spars

Hi all

I've read in the forum that I shouldn't touch the wing spars just use them as is. But man are they a little rough! Sharp edges, tooling steps, etc. Vans guidance in section 5 is to file the edges on everything to remove the tooling marks, why doesn't the spars need this done?

Also, what about the aluminum angles (for rib attachment) that are pre-riveted to the spar? Their edges are pretty rough also, are they fair game for a little SB wheel or file?
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  #2  
Old 04-17-2018, 02:50 PM
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mike newall mike newall is offline
 
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Good point, well made.

One of our spar 'leaves' stands proud and is giving an issue with pin fit. The spar goes deep enough, but the bush just sits a RCH low due to one leaf being a little high. I will wait for Scott's input
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  #3  
Old 04-17-2018, 03:48 PM
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Piper J3 Piper J3 is offline
 
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Quote:
Originally Posted by mike newall View Post
sits a RCH low
I think that may be a first for VAF...
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  #4  
Old 04-17-2018, 11:07 PM
rk2436 rk2436 is offline
 
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The official response has been to leave them alone and use as is. I couldn't live looking at those rough edges on the spars visible in the cockpit. So I took the vixen and smoothed that section out. Nothing you can do about all the spar caps further outboard,probably do more harm than good. Yeah, I know I knocked off the anodizing or primer but a wipe every once in a while keeps them looking nice. Keep at it,it's an awesome flying plane!!
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  #5  
Old 04-18-2018, 01:26 AM
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az_gila az_gila is offline
 
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Quote:
Originally Posted by Piper J3 View Post
I think that may be a first for VAF...
Nah, it's a common engineering term...

http://www.vansairforce.com/communit...14&postcount=3

OK looking at post#2, it maybe with somewhat of a UK origin... B. Eng., University of Liverpool, 1968

An even smaller unit of measurement would refer to the male reproductive organ of a gnat.
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  #6  
Old 04-18-2018, 11:30 AM
rv9builder rv9builder is offline
 
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Quote:
Originally Posted by JwWright57 View Post
Hi all

I've read in the forum that I shouldn't touch the wing spars just use them as is. But man are they a little rough! Sharp edges, tooling steps, etc. Vans guidance in section 5 is to file the edges on everything to remove the tooling marks, why doesn't the spars need this done?

Also, what about the aluminum angles (for rib attachment) that are pre-riveted to the spar? Their edges are pretty rough also, are they fair game for a little SB wheel or file?
I had the same question about the parts in the pre-built fuselage center section. Tech support told me the anodized parts were OK to use in the condition we received them.

Having read Section 5, I was surprised at their answer. While the center section parts weren’t likely to draw blood, I could certainly feel roughness. Perhaps many of us (including me) have been making the edges of parts a lot smoother than they need to be.
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  #7  
Old 04-27-2018, 03:13 PM
AeroDog AeroDog is offline
 
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Quote:
Originally Posted by Piper J3 View Post
I think that may be a first for VAF...
I first encountered that unit of measure during my first year as an engineering student back when dinosaurs roamed the earth. I didn't realize that it is also used on the other side of the pond.

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  #8  
Old 04-27-2018, 07:45 PM
RFSchaller RFSchaller is offline
 
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Defined in my Navy Nuke days as the finest discernible adjustment possible!😜
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  #9  
Old 04-27-2018, 07:53 PM
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mike newall mike newall is offline
 
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As our learned correspondent alluded to, it is oft referred to over here as a GCH, which indeed, as a cross section dimension is a very tiny measure, slung under an insect and probably flying in the wind....

I used the Americanised version to enable Colonial colleagues to acknowledge the minute amount involved.....
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  #10  
Old 04-28-2018, 07:42 PM
RFSchaller RFSchaller is offline
 
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