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02-08-2012, 03:44 PM
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Join Date: May 2006
Location: Boone, Iowa
Posts: 342
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Quote:
Originally Posted by Gregg Brightwell
... would a LONG straight backrivet set be able to be 'straight' enough on the rivet to make a nice finish? That would help keep the squirrely offset out of the picture??
Gregg
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That is why ours is straight, the angle is minimal and most of the time you can push the bottom side of the rib aside a little. We also machine in a slight concave to the end of the set to keep you in the middle. But capturing the collar with your finger and holding against the Aluminum is a must. I use the capture and brace technique with any rivet set though, backrivet or regular.
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02-08-2012, 04:23 PM
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Join Date: Jul 2006
Location: Fairmont MN
Posts: 41
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Back Riveting Top Wing Skin
I back riveted all the top skins on my RV7 wings. Had trouble controlling the offset until I put the hook side of a velcro sheet (pile & stick) on the offset. After that I had complete control.
Mark
Building RV7
Flying RV6
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02-08-2012, 07:13 PM
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Join Date: Jan 2007
Location: Benton, Kansas
Posts: 259
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Quote:
Originally Posted by clevtool
That is why ours is straight, the angle is minimal and most of the time you can push the bottom side of the rib aside a little. We also machine in a slight concave to the end of the set to keep you in the middle. But capturing the collar with your finger and holding against the Aluminum is a must. I use the capture and brace technique with any rivet set though, backrivet or regular.
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Thanks Mike, I will check yours out.... I do the capture and brace thing too. Absolute MUST for control. Have had NO issues with backriveting. Piece of Cake...
Regards,
Gregg
__________________
Gregg J. Brightwell
Benton, KS
CFII/MEII, ATP, AGI, A&P
-4 Emp and Wings complete!
Fuselage out of the jig!
www.mykitlog.com/gbrightwell
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02-08-2012, 07:25 PM
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Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,514
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Quote:
Originally Posted by Flying Scotsman
Same comment on holding the nylon ring with your fingers to keep it from walking around, AND...increase the air pressure somewhat (the long rivet set seems to absorb a lot of the energy, thus making for longer rivet times, which increases the odds of things going awry, it seems).
Used on my wings with that ginormous mushroom backrivet "bucking bar" thingie, and they came out perfect!
Keep trying...
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Steve,
Is this the mushroom backrivet "bucking bar" thingie?
http://www.averytools.com/prodinfo.asp?number=635
Thanks.
__________________
RV-12 Build Helper
RV-7A...Sold #70374
The RV-8...Sold #83261
I'm in, dues paid 2019 This place is worth it!
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02-09-2012, 06:12 AM
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Join Date: Aug 2006
Location: Northwest Arkansas
Posts: 102
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I used the extended backrivet set from Cleaveland with very good results. Like Mike says, the length makes the slight angle caused by the rib flange a non-issue, especially if you flex the rib out of the way a little.
__________________
Gary Moore
Northwest Arkansas
Working on the firewall forward....
RV-7, N742GM (Reserved)
http://mykitlog.com/mhead
Donated 9/9/19
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02-09-2012, 09:35 AM
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Join Date: Nov 2010
Location: Okanagan Valley BC, Canada
Posts: 483
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Double offset back rivet set
I used the Avery double offset and had fits trying to get consistent shop heads. Eventually discovered that the gun end of the shank was not parallel with the set end of the shank, so every time you would change position for an obstacle, the tails would come out different. Lots of drill outs...
About 3/4 of the way through the top skins the set broke and we went back to a swivel mushroom set on the gun and tungsten buck. Every one came out perfect.
If I were to do it again I would not use the double offset, though might try Cleaveland's straight one...
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Ron Townson
Okanagan Valley BC, Canada
RV-8 Completed Dec 2013
Membership renewed Sept 8, 2019
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02-09-2012, 12:22 PM
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Join Date: Jul 2006
Location: Stone Mountain, Georgia
Posts: 483
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That's it
David,
That is the bad boy you need to back rivet the wings.
__________________
Steve Ashby
Stone Mountain, GA
N184RW (reserved)
RV-8A
YIO-360 180 hp Lycoming
Hartzell Blended Airfoil Prop
Engine Hung
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02-09-2012, 03:32 PM
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Join Date: Feb 2010
Location: Vancouver, BC, Canada
Posts: 860
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Back riveting wing skins
Although I had good luck with the straight backrivet set with the plastic collar on the control surfaces with a bench mounted back riveting plate, I did not have good success trying to back rivet the wing skins with the big mushroom set on the outside.
I used a standard flat set in my 2X gun on the outside of the skin and a tungsten bucking bar on the inside. To prevent the rivet set from marking the alclad skin, I used a piece of riveter's tape on the manufactured head.
Very satisfactory results.
__________________
Terry Edwards
RV-9A (Fuselage)
2020/2021 VAF Contribution Sent
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