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06-05-2011, 08:28 AM
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Join Date: Jan 2005
Location: Victoria, Canada
Posts: 2,251
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Quote:
Originally Posted by AussieRV
G'day guys,
I'm about to rivet HS on my -8 together ... and have a "wombat" question. When riveting the HS-609PP's to the HS-603PP ... which side should the shop head be on?
I've looked at numerous builders sights and i've seen the rivet point both directions ... but which is the correct one?
Many thank,
Matt
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Common practice is to have the factory head against the thinner material, but there are more important considerations, such as:
-access for bucking or driving the rivet
-the ability to drill out rivets
-ease of inspection
-appearance
In my opinion, access for drilling out rivets is the most important. Not just because a rivet may be bad, but because you may wish to de-rivet an assembly later on.
V
__________________
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V e r n. ====
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RV-9A complete
Harmon Rocket complete
S-21 wings complete
Victoria, BC (Summer)
Chandler, Az (Winter)
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06-05-2011, 01:29 PM
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Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,653
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Vern is entirely correct. There is another consideration, clearance for other assemblies, but that is usually specified in the plans. If flush rivets, pay attention to which side the flush head goes on (I'm not talking skin rivets, I'm talking about rivets used to allow to assemblies to mate flat). Sometimes even the universal head is important because it's height is consistent and usually thinner than the shop head, so read ahead and see what else may go nearby. But if the plans don't specify, then follow the common practices and you won't go wrong.
__________________
Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
http://www.mykitlog.com/flion/
EAA Technical Counselor #5357
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06-05-2011, 07:21 PM
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Join Date: Apr 2007
Location: Sydney Australia
Posts: 38
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Excellent - thank you gents for your response.
Cheers,
Matt
__________________
Matt Segafredo
RV8 Fast Back (flat pack)
Sydney - Australia
"I'd Rather Be Flying"
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06-06-2011, 08:19 AM
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Join Date: Jan 2005
Location: The Beautiful NJ Shore
Posts: 409
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Van's Plans are very good at showing you the orientation of the rivets for each assembly. The basic rule is that the shop head should point Inside, Down or Aft. Vans has a lot of exceptions to this rule.
__________________
Greg Piney
RV-8 2547
Empennage Done!
Beginning Fuselage Final Assembly!
(Tub finished, on to Landing Gear).
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06-06-2011, 09:14 AM
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Join Date: Nov 2005
Posts: 123
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Rivet Removal?
One more thing to consider. If I screw it up, from which side can I drill the shop head the easiest?
Alan Jackson
Hartselle, Alabama
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07-06-2011, 08:17 PM
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Join Date: Oct 2010
Location: Berwick, Nova Scotia, Canada
Posts: 83
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Does It Matter Which Side the Shop Head Is On?
Hey Folks,
I just riveted together my rear spar for the HS. I riveted the 609PP and 603PP parts together. For ease of assembly (I used my squeezer) I put the factory heads on the 603PP side, hence the shop head would be on the 609PP side. After looking at some pics from other builders, everyone else did it the other way. Am I now going to have to drill out all those rivets and replace them the other way?
Thanks
Chris
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07-06-2011, 08:40 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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Absolutely NOT!
No hard rule on this. If all else is equal, most people prefer to have the shop head on the side of the thicker material. This creates less distortion. But there is no set rule. Certainly not enough to drill out perfectly good rivets.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
Last edited by Mel : 07-06-2011 at 08:43 PM.
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07-06-2011, 09:14 PM
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Join Date: Nov 2006
Location: Waco, Texas
Posts: 1,658
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I agree with Mel.
In general I try to put mine on the thicker material, but I also think about the need for a possible disassembly effort in the future. If I need to drill rivets for some unknown reason in the future, I like having the manufactured head facing me so I know where absolute center is to drill the rivet. This way my chances of enlarging holes goes way down in the future.
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07-07-2011, 05:24 AM
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Join Date: Oct 2010
Location: Berwick, Nova Scotia, Canada
Posts: 83
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Thanks Mel and Phil!
I built my VS first. During the construction of the spar, for that, Vans has you put the factory head on the side with the thin metal, so shop head on thick metal side. They mentioned that typically the factory head goes on the thick metal side. I just wanted to make sure there was no hard rule on this.
Chris
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