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Gaps under pull rivets

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mstratman

Active Member
Joined
Aug 1, 2016
Messages
26
Location
Forest Park, IL
I've started to get gaps, up to 0.0025, beneath the rivets I'm pulling with a hydraulic/pneumatic riveter. I've double+triple checked that I'm holding it flush and flat. I took it apart and cleaned it, ran oil through. I tried running it up to 120 PSI, down to 80 and below, no luck.

My hand riveter pulls extremely tight - which is how I noticed the difference.

Any ideas what might be wrong, or what to look for?
 
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