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  #11  
Old 09-27-2015, 01:34 PM
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My money is on the cup set being undersized.

This photo sure makes it look that way....................................

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  #12  
Old 09-27-2015, 02:10 PM
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Here's how I would fix that:

1. Firmly grasp the rivet set between the thumb and forefinger of the right hand.

2. Using a gentle but positive underhand motion, toss it towards the nearest waste receptacle.

3. Order a new rivet set from Avery Tools or another reliable vendor!
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  #13  
Old 09-27-2015, 05:11 PM
David Paule David Paule is offline
 
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I got similar results with one set. Replaced it and have been considerably happier.

Dave
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  #14  
Old 09-29-2015, 06:25 PM
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OK I misread the original post - you were using a squeezer. The die is under size and you should not get the rings at all. Apologies.
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  #15  
Old 09-30-2015, 05:10 AM
PhilS-R PhilS-R is offline
 
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Default Similar problem

I am having exactly the same problem; the original pictures posted are precisely what I am getting with my 1/8 set. There is a consistent symmetrical circular mark on every rivet head. The rivets have been set with a pneumatic squeezer. As a newbie I assumed the mark was a natural consequence of being squeezed at 3000psi!

The set is the correct size though - 1/8 AN470 written on the edge. I will contact the supplier for a replacement. I'm just glad that I won't be replacing the rivets already set!
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  #16  
Old 09-30-2015, 10:11 AM
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Definitely don't replace the rivets... but don't keep making the mistake.

My problem with photos is that I can rarely tell the severity of the problem. When anodizing scuffs and gets shiney with pressure it can sometimes look like a cut and such. My rule of thumb is that if you can feel the 'mark' with your fingernail, something is wrong.

If it is something that you feel, but just barely, put the set into a drill/drill press, use 320 sand paper and an eraser and just polish the outside edge. Then follow with 600 sandpaper to polish. Try again.
If that does not solve it replace the set.

It could be the set was mismarked and is not a 'universal' set, but rather another rivet geometry. Universal sets have a small flat at the very center and a tangent radius out from there. Other sets are just radiused and should not be used on 470 rivets.

It could also be that the set was machined incorrectly. Most machining operations can be measured quite easily. The diameter can be adjusted. In the cup set there is really nothing to measure. We rarely make cup sets in-house, but we have in the past, and do inspect them. It's rather empirical by taking a rivet and feeling the side to side play, combined with looking at the tangency of radiuses as they flow from the center to the OD of the part.

Finally Martin Aircraft just went out of business. They were our source and the source for at least two other popular tool vendors. In the six months prior to folding, they had many internal issues which we saw manifest in products. The sets shown in the photo are not made by them, but there are likely hundreds of Martin sets out in the field from this time frame. We have a bag of them that were pulled during inspection (and not returned before the fold... ugh).

Hope this helps with your evaluations,
Mike
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