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  #1  
Old 04-22-2015, 02:45 PM
localizer localizer is offline
 
Join Date: Aug 2012
Location: Greenville, SC
Posts: 50
Default Pneumatic squeezer does not work on rivets

Hello everyone,
I have a new pneumatic squeezer which I have used for dimpling skins and ribs when I began working on my project. Then I took a year and a half off and now I'm back.
I picked up the squeezer and tried to buck some rivets, but nothing happened. It seems like there is no power in the squeezer. It does dimple though.
What am I missing? What PSI should I use?

Thanks,
Yuri
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  #2  
Old 04-22-2015, 03:01 PM
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akarmy akarmy is offline
 
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Default

Check the adjustment of the rams. If it's set too tight it won't generate the force needed, so you need to just back off the adjustment a bit to get it to squeeze.
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  #3  
Old 04-22-2015, 03:05 PM
FredMagare FredMagare is offline
 
Join Date: Mar 2006
Location: Kyle, TX
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If you are trying to set 1/8" rivets, it may be necessary to set the squeezer so that you partially squeeze on the first pass and completely set them after readjusting the set lower. My understanding is that it has something to do with the stroke of the pneumatic squeezer where it generates the majority of it's power near the end of the stroke.

If you get no power setting -4 rivets, then I don't know what to tell you.... I've never had a problem with mashing and mangling them regardless of how I've set my squeezer.

Good luck.
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  #4  
Old 04-22-2015, 03:15 PM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
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Default Adjustment

Quote:
Originally Posted by FredMagare View Post
If you are trying to set 1/8" rivets, it may be necessary to set the squeezer so that you partially squeeze on the first pass and completely set them after readjusting the set lower. My understanding is that it has something to do with the stroke of the pneumatic squeezer where it generates the majority of it's power near the end of the stroke.

If you get no power setting -4 rivets, then I don't know what to tell you.... I've never had a problem with mashing and mangling them regardless of how I've set my squeezer.

Good luck.
That's the answer. The squeezer generates all its power at the end of the stroke.
Hopefully you have an adjustable ram. It's a pain to adjust with washers.
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  #5  
Old 04-22-2015, 03:16 PM
Loman Loman is offline
 
Join Date: Feb 2008
Location: Dublin, Ireland
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Default Back off a little

Counterintuitive as it seems, back off a little on the moveable die (less spacer washers under the head or, if adjustable, screw the plunger down into the body of the yoke).

The squeezer has very little power except in the last 1/8th inch or so of its travel when it develops something like 3000 lbs/sq in. Your problem is likely to be that it is contacting the rivet tail and being stopped before it gets to the range where full force is developed.

Try creeping up on the setting you need beginning with 'wide open' while setting some rivets in a test piece. However, if you repeatedly set the same rivet, it will work harden and you will get too close a setting before the rivet tail finally gets to the shape you are looking for. If if not work hardened, there is always some spring back so setting the gap by measurement alone is tricky. After a while, you will set the gap intuitively and get it right first time every time.
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  #6  
Old 04-22-2015, 03:30 PM
localizer localizer is offline
 
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Location: Greenville, SC
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Thank you for answers, guys!

Yes, I do have adjustable rams. And yes, I have wrenched moving one up as high as I could to minimize possible screw up if I were to hold the squeezer at some wrong angle.

Ok, I will open it wider and see if I can mash a rivet. I was trying 3/32 and 1/8. I will report back.
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  #7  
Old 04-22-2015, 03:34 PM
TS Flightlines TS Flightlines is online now
 
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this may sound stupid---but WHICH pneumatic squeezer do you have?
Tom
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  #8  
Old 04-22-2015, 03:38 PM
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ERushing ERushing is offline
 
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Default

Note that Avery sells low-profile sets that can give you a bit more at the end of the stroke.
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  #9  
Old 04-22-2015, 07:45 PM
spark68 spark68 is offline
 
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Location: Lk Havasu City, AZ
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Default Try this...

Agree with above. The pneumatic squeezers work on a cam action and develop the most force at the end of the stroke.

Try setting the squeezer shut height without anything in the gap. Set the open gap for the approximate finished height of a squeezed rivet. Then try it on your test piece (or just a plain rivet). Should get you close.
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  #10  
Old 04-22-2015, 08:04 PM
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Dan Langhout Dan Langhout is offline
 
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Location: Huntsville, AL USA
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Default 90 PSI

I ran mine at 90 PSI. It would squeeze -4 rivets with no problem. I would not expect any problems unless you are trying to squeeze really long rivets. As others have said, it generates more force the more it closes.

A mistake I occasionally made was to switch from shooting rivets with the gun (pressure set to 20-40 something psi) to the squeezer without resetting the pressure back to 90. It sure enough wouldn't squeeze at the lower pressure!
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