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  #1  
Old 07-02-2017, 06:21 AM
Reflex Reflex is offline
 
Join Date: Jan 2015
Location: Baldwin City, Kansas
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Default 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
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  #2  
Old 07-02-2017, 06:25 AM
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M McGraw M McGraw is online now
 
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Default Air pressure

In general I used 40-45ish for AN3 and 60ish for AN4.
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  #3  
Old 07-02-2017, 06:45 AM
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DaleB DaleB is offline
 
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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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  #4  
Old 07-02-2017, 09:38 AM
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kiljoy kiljoy is offline
 
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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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  #5  
Old 07-02-2017, 11:06 AM
MED MED is offline
 
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Location: Aiken, SC
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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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  #6  
Old 07-02-2017, 11:38 AM
Polar Polar is offline
 
Join Date: Oct 2013
Location: Central Alberta
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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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  #7  
Old 07-02-2017, 12:41 PM
Reflex Reflex is offline
 
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Location: Baldwin City, Kansas
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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
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  #8  
Old 07-02-2017, 01:23 PM
BillL BillL is offline
 
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Quote:
Originally Posted by Reflex View Post
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
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.
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  #9  
Old 07-05-2017, 11:09 PM
Marc Bourget Marc Bourget is offline
 
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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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