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07-02-2017, 06:21 AM
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Join Date: Jan 2015
Location: Kansas
Posts: 169
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Air Pressure - AN470AD4-7
I'm having a bit of trouble setting the rivets in the picture below. It appears that I'm not using enough air pressure in my 3X gun. Wondering if anybody remembers what they used. Currently trying to use a double offset with a 1.6 lb. tungsten bar.
Currently using 45 psi. Seems that I may need significantly more pressure. Thought I'd ask before I jack the pressure up and risk "engraving" the spar with smilies.
For those that can't quite picture what I'm working on, it's the final rivets on the HS stab for an RV-14.
Many thanks,
Fred
__________________
Dues Paid for 2020
RV-14
Empennage Complete (including fiberglass)
Wings complete (including fiberglass)
Fuse joined and working on painting interior
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07-02-2017, 06:25 AM
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Join Date: Dec 2012
Location: Greenback, TN
Posts: 534
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Air pressure
In general I used 40-45ish for AN3 and 60ish for AN4.
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Marvin McGraw, 5TN4
RV-14. #140039 Complete
Flight hours: 500+
2020 Dues Paid
The Dues Paid note is a reminder for me
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07-02-2017, 06:45 AM
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Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
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I found that a long double offset has a lot of mass, and needs more pressure than you'd think. There were places where I had to use it, but I tried to find other ways whenever I could. I don't remember specifically how much pressure I had to use, but the exact number would vary depending on the gun and other factors anyway. Don't be afraid to crank it up to get the result you need.
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Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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07-02-2017, 09:38 AM
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Join Date: Sep 2014
Location: Alameda, CA
Posts: 191
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I shot those rivets the other day. I had to use a long offset rivet set extension to get to them. The thing I had to remember is to not tighten up the rivet set all the way down. Even then I had to set my PSI to 60 and it still took 5-7 seconds of bucking to get them down.
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Dues paid (2020)
RV-14 #140394
Empennage - done(ish)
Wings - done(ish)
Fuselage - done(ish)
Finishing Kit - Somewhere in there
YouTube Build Channel
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07-02-2017, 11:06 AM
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Join Date: Jul 2015
Location: Aiken, SC
Posts: 620
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Used a double offset set in a #3 gun, 60#, and a small tungsten bar. Worked great.
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07-02-2017, 11:38 AM
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Join Date: Oct 2013
Location: Central Alberta
Posts: 63
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I ended up buying a 12" straight set to get into those. I set the first rivet with an offset, but didn't like how much pounding it took to get a good shop head. The long straight set made quick work of it
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07-02-2017, 12:41 PM
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Join Date: Jan 2015
Location: Kansas
Posts: 169
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Many thanks for the quick replies. Just completed setting those 10 rivets. Ran the regulator up to 65 psi and used double offset. Rivets became a non issue. In fact, may be the best rivets I've set!
Thanks again.
Fred
__________________
Dues Paid for 2020
RV-14
Empennage Complete (including fiberglass)
Wings complete (including fiberglass)
Fuse joined and working on painting interior
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07-02-2017, 01:23 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Quote:
Originally Posted by Reflex
Many thanks for the quick replies. Just completed setting those 10 rivets. Ran the regulator up to 65 psi and used double offset. Rivets became a non issue. In fact, may be the best rivets I've set!
Thanks again.
Fred
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Not only rivet size, but the stiffness of the structure will demand higher pressure. Keep that in mind for areas where there it is not a broad flat surface under. Like corners. Also, use more tape on the set.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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07-05-2017, 11:09 PM
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Join Date: Apr 2009
Location: Stockton, California
Posts: 296
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No smilies when you keep things under control and in alignment. (i.e., if you don't over-drive)
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