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Two local RV-6A builders (Marc Guay and John Lukes) made a neat attachment for a pneumatic rivet squeezer to allow it to be used to dimple large skins.

It was made from a piece of 3/4 inch steel plate about 32 inches long by 20 inches high. It is essentially a very large squeezer yoke, with a 20 inch throat depth.

I clamped it in a Work Mate table (also graciously loaned by John Lukes), and used a piece of 1/4 inch plywood with a 1/2 inch hole (to go around the male dimple die) as a table. This thing does super job! Quick, perfect dimples. Thanks John!

Here is a close-up of the dimple dies and the plywood table.

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  • A couple of viewers have asked for more info on this large yoke. I\'m posting the text from one of my replies just in case anyone else is interested.

    The part that attaches to the squeezer is exactly the same as a regular squeezer yoke. There are two holes for the bolts that connect it to the squeezer body, and a hole where the ram slides. The thing is made of steel, 0.75\" thick, machined down a bit thinner where it mounts to the squeezer. The area that is machined thinner is quite small - just enough area to let it fit between the two plates on the squeezer that have the bolt holes in them. The area where the hole for the ram is located is the full thickness of the plate, i.e. 0.75\". There is 1.375\" between the two arms of the yoke. There is about 20\" of reach from where the die sits to the far end of the slot between the arms. The large curve at the right side of the yoke (top picture) has about a 10\" radius.

    You\'ll note from the pictures that the yoke actually mounts on the opposite side of the squeezer from a regular yoke. If you look at the bottom picture, you\'ll see that the yoke extends to the right side of the picture, whereas a regular yoke would be going to the left, assuming the squeezer was in the same orientation.

    You could do most of the flat skins with a bit less throat depth on the yoke. I took a couple of quick measurements tonight, and it looks like a 15\" yoke would probably work on everything except maybe the big flat skin that forms the cockpit floor from the firewall to the front spar. It is a pain to measure that one right now, and the garage is really, really cold tonight, so I didn\'t try. I recall that one used almost all the depth on this yoke.

    Even with a yoke this big you can\'t use it for much of the curved skins on the rear fuselage top and bottom. There is too much curve in those skins to get much of them into the yoke. You can put the fore and aft ends of the skin in the yoke throat, but you would need several feet of depth to reach all the way to the middle of those skins. So you will have some work to do with the C-frame no matter what you do.

    Kevin Horton