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Rivet Stem jam in riveter???

 
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Andrewlieser



Joined: 15 Mar 2008
Posts: 43
Location: Chicagoland

PostPosted: Sun May 04, 2008 4:42 pm    Post subject: Rivet Stem jam in riveter??? Reply with quote

Hey everyone, I finally got my rudder ready for riveting and was pulling rivets when my Zenith pneumatic riveter jammed! It jammed on the first A5 I pulled after changing heads from the A4's. The stem broke fine from the rivet but it logged in the clamps inside the riveter. After many attempts to pull it out it snapped and I now have about a 1/4 ' piece of it jammed in the clamps. I have been unsuccessful in my attempts to remove the black nose piece from the green face as well. Please help me, I am extremely frusterated and don't want to do something stupid like run my semi riveted rudder through a saw! On a side note the plans allow for a tolerance of .3mm rivet head spacing how might one measure this I have 2 rivets in question that I can see light through one side when looking at it slightly. It looks tiny but then again .3mm is in fact tiny.

yours truely,
perplexed

Laughing


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Andrewlieser



Joined: 15 Mar 2008
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Location: Chicagoland

PostPosted: Sun May 04, 2008 4:44 pm    Post subject: Re: Rivet Stem jam in riveter??? Reply with quote

I meant rivet head GAP not spacing, sorry

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Tim Juhl



Joined: 21 Mar 2006
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PostPosted: Sun May 04, 2008 5:20 pm    Post subject: Re: Rivet Stem jam in riveter??? Reply with quote

Andrew,
I'm not familiar with the riveter that ZAC sells but I have had stems jam up before - On mine you add a little air tool oil in the air hose inlet before you use it, and that helps prevent jams. You might try holding the trigger in (with the air connected) while pointing the nose down and tapping the back with a piece of wood or mallet to see if the stem drops out. You might also try pushing it out with another rivet. Surely one of the guys with a ZAC riveter will jump in with better advice.

If you can actually see daylight around a installed rivet then the rivet needs to be replaced with a larger size. The hole must be filled (when the rivet is pulled) and flush to the surface. If you see daylight around a rivet that you haven't pulled and are curious as to whether the hole is the proper size, check the Construction Standards and see what the maximum hole size is for the thickness of aluminum you are riveting and get a drill bit that is equal or slightly smaller than that size. If the stem of the bit won't go in the hole then you should be OK. If you want more info contact me off list and I'll dig out my book and tell you what I use.

BTW - A high speed drill does a better job on aluminum than your typical rechargeable model. I use a 3600 rpm air drill. In addition, get aircraft grade 135° split point bits and throw them away when they get dull. They make a clean hole and tend to start without wandering off the mark.

Tim

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PostPosted: Sun May 04, 2008 5:27 pm    Post subject: Rivet Stem jam in riveter??? Reply with quote

Andrew--
It sounds like your rivet gun needs a drop of oil in it. First, however, you'll need to remove the piece of broken rivet stem. You will probably need to disassemble the gun. At the back end of the gun(oppisite end from where the rivet is pulled) you should be able to unscrew the parts of the riveting head. Once these parts are removed it should relieve the pressure on the gripping heads and the stem piece should be removed. Add a few drops of light oil as you reassemble the gun and allshould be well. Periodiaclly add a drop of oil and you should be able to avoid any more jams.

George May
601XL 912s


Quote:
Subject: Rivet Stem jam in riveter???
From: Andrewlieser(at)gmail.com
Date: Sun, 4 May 2008 17:42:15 -0700
To: zenith-list(at)matronics.com

--> Zenith-List message posted by: "Andrewlieser" <Andrewlieser(at)gmail.com>

Hey everyone, I finally got my rudder ready for riveting and was pulling rivets when my Zenith pneumatic riveter jammed! It jammed on the first A5 I pulled after changing heads from the A4's. The stem broke fine from the rivet but it logged in the clamps inside the riveter. After many attempts to pull it out it snapped and I now have about a 1/4 ' piece of it jammed in the clamps. I have been unsuccessful in my attempts to remove the black nose piece from the green face as well. Please help me, I am extremely frusterated and don't want to do something stupid like run my semi riveted rudder through a saw! On a side note the plans allow for a tolerance of .3mm rivet head spacing how might one measure this I have 2 rivets in question that I can see light through one side when looking at it slightly. It looks tiny but then again .3mm is in fact tiny.

yours truely,
perplexed

[Laughing]

--------
Andrew Lieser
S/N 6-7045
http://websites.expercraft.com/andrewlieser




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Andrewlieser



Joined: 15 Mar 2008
Posts: 43
Location: Chicagoland

PostPosted: Sun May 04, 2008 5:40 pm    Post subject: Re: Rivet Stem jam in riveter??? Reply with quote

Let me clarify the rivet spacing statement because I just re read it and it is a bit confusing. The edge of the rivet head does fill the hole completely, it is only when looking from the side and checking to see the rivet head flush against the aluminum that I see a very minute gap only on one side of the rivet between the aluminum and the rivet head. It looks like the rivet gun head may have not quite 90 degrees to the aluminum. I'm not sure there even .3mm but I don't know how to measure that small. Thanks for the suggestions I will give em a try and let you know.

Thanks,


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PostPosted: Mon May 05, 2008 2:07 am    Post subject: Rivet Stem jam in riveter??? Reply with quote

Hi Andrew,

I have found many rivets that I installed with the head not perfectly
tight against the sheet metal. One standard I use to decide whether
to drill the rivet out is to try to slide a piece of paper under the
head of the rivet. If the paper goes under the head and reaches the
stem of the rivet then I drill it out and install another one.

I also made some riveter heads with large flat areas that contact the
sheet metal instead of the narrow ones commonly shipped with the
riveters. This large area helps position the riveter perpendicular
to the sheet metal. It also makes it difficult to install rivets
close to obstacles, so you can't use it all the time. I know this
sounds like a lot of effort, but I think it is worth it to make the
riveting process a little smoother since there are A LOT of RIVETS to
install in an airplane.

Paul
XL fuselage
At 06:40 PM 5/4/2008, you wrote:
Quote:
Let me clarify the rivet spacing statement because I just re read it
and it is a bit confusing. The edge of the rivet head does fill the
hole completely, it is only when looking from the side and checking
to see the rivet head flush against the aluminum that I see a very
minute gap only on one side of the rivet between the aluminum and
the rivet head. It looks like the rivet gun head may have not quite
90 degrees to the aluminum. I'm not sure there even .3mm but I
don't know how to measure that small. Thanks for the suggestions I
will give em a try and let you know.

Thanks,

--------
Andrew Lieser


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