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-   -   Deburring spars (http://www.vansairforce.com/community/showthread.php?t=159648)

JwWright57 04-17-2018 10:59 AM

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?

mike newall 04-17-2018 03:50 PM

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 :D

Piper J3 04-17-2018 04:48 PM

Quote:

Originally Posted by mike newall (Post 1253756)
sits a RCH low

I think that may be a first for VAF...

rk2436 04-18-2018 12:07 AM

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!!

az_gila 04-18-2018 02:26 AM

Quote:

Originally Posted by Piper J3 (Post 1253764)
I think that may be a first for VAF...

Nah, it's a common engineering term...:D

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.

rv9builder 04-18-2018 12:30 PM

Quote:

Originally Posted by JwWright57 (Post 1253701)
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.

AeroDog 04-27-2018 04:13 PM

Quote:

Originally Posted by Piper J3 (Post 1253764)
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.

Jerre

RFSchaller 04-27-2018 08:45 PM

Defined in my Navy Nuke days as the finest discernible adjustment possible!😜

mike newall 04-27-2018 08:53 PM

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.....:D

RFSchaller 04-28-2018 08:42 PM

FORMER colony! —- We won fair and square!😝


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