Is my pneumatic squeezer broken?

[Stalldog]

You know, it's strange, but when I spoke with Isham a couple of weeks ago when looking for a no hole yoke they also indicated I would need the longer adjustable set. I ended up buying a no hole yoke from Cleveland, and they indicated I would not need a longer adjustable set, that it would work with my existing set. I've installed and used it with my existing set and it seems to work fine. So, I'm guessing the one from Isham is maybe a little different from others and that it does require a 1.25 inch set. Again, let us know what Isham says about your problem and how to resolve it.

[jlott]

Well, for what it's worth I have been using the adjustable set with the thin nose yoke for the entire build whenever I've needed it. It's always worked fine.

I just started having this problem during my rudder build.

Isham had this to say:

> Justin,
>
> You cannot use the adjustable set holder with the 4" thin nose yoke. Use the fixed set holder that came with that yoke. The adjustable set holder only works with the 1" base yokes. This will not set rivets properly and will potentially mess up the threads on your adjustable set holder. See this link:
>
> http://www.planetools.com/Yoke-Base.htm
>
> Also, if the rivet you are setting is too long this can cause them to bend over. Don't rely on Van's rivet length callouts.
>
> Let me know if this corrects the problem.

To which I replied:

----------------------------------
Well, I tried using the fixed set holder. Interestingly I still seem
to be having the same problem. I've actually never used the fixed set
holder before.

I snapped a couple pics which I've linked below. Used three washers
and my longest flush set on a 3-3.5 rivet. There is still a noticeable
angle when the set holder is fully extended. You can make it out in
the second pic and can definitely feel it with your fingers.

I also tried setting a 3-3.5 rivet using this setup just for the heck
of it. Sure enough it folded right over like all the others I've
set at least a hundred rivets with this squeezer and just started
having this problem while working on the rudder. Very frustrating. I
hope I'm just doing something wrong but I cant think what that might
be.

Thanks for your help and insight,
Justin

https://dl.dropbox.com/u/49973161/20...5_20.19.02.jpg
https://dl.dropbox.com/u/49973161/20...5_20.19.24.jpg
-----------------------------------

We will see what becomes of that.

Justin

[Stalldog]

I see the rivet being offset, but that is with the rivet unheld between the set and the end of the no hole yoke. Are you getting the same result when riveting two pieces of sheet metal? Just wonder if being set in a hole would keep it from bending offcenter.

[jlott]

Originally Posted by Stalldog

I see the rivet being offset, but that is with the rivet unheld between the set and the end of the no hole yoke. Are you getting the same result when riveting two pieces of sheet metal? Just wonder if being set in a hole would keep it from bending offcenter.

Yeah they set incorrectly when, in this case, riveting the rudder skin to the top rib flange.

[Bill.Peyton]

The rivet set you are using may have too many washers under it, which allows it to slide due to lack of overlap. I had a similar issue and Isham sent me a much longer flat set to use with the shorter rivets, it is at least 50% longer and does not require any washers for the 3.5 lengths.

[FlyingArcher]

And what about the yoke itself? I've seen this kind of 4" yokes opening themselves, thus leading to this same kind of angle you get between the holder and the upper yoke surface.
Can you measure the opening distance between top and bottom of yoke before squeezing and when at full actuation? That would tell how much the yoke opens and if it's the culprit.
My 0.02?