Rivets


A rivet is a permanent mechanical fastener. Before being installed a rivet consists of a smooth cylindrical shaft with a head on one end. The end opposite the head is called the buck-tail. On installation the rivet is placed in a punched or pre-drilled hole, and the tail is upset, or bucked (i.e., deformed), so that it expands to about 1.5 times the original shaft diameter, holding the rivet in place. To distinguish between the two ends of the rivet, the original head is called the factory head and the deformed end is called the shop head or buck-tail.

Because there is effectively a head on each end of an installed rivet, it can support tension loads (loads parallel to the axis of the shaft); however, it is much more capable of supporting shear loads (loads perpendicular to the axis of the shaft). Bolts and screws are better suited for tension applications.



Forming a rivet


This is a YouTube video. Click on the image to view the video.

Spring swage for forming tenons and/or rivets.

Monkey tools to help standardize the shank
of the rivet and square off the transition
to the rivet head.
 
First round stock, the diameter of the final rivet, is heated and inserted into the rivet block with the exposed stock hammered into the head of the rivet. Quenching the rivet block will help free the rivet from the rivet block. Conversely you could use a number methods to get the rivet the appropriate diameter. Shown above is a custom "vice tool", a spring swage rivet tool, and a set of monkey tools. The rule of thumb is 1-1/2 the diameter of the rivet stock to form the (one) head. Also, keep in mind that it is better to make the rivet a little longer than you might need and cut off any excess when you go to use it. This also allows you to make a batch of rivets ahead of time so you have them available whenever you need them.


Using a rivet


A tool for handling rivets while you're heating them.
Makes it easier to retrieve them than just tossing
them into the fire and hoping.


Tongs for holding rivets when they're hot.
Use the tool on the top-left to put the rivet into the fire without losing it. When you take it out of the fire you can start to put it down on a flat surface and grab it with the rivet tongs when it rises out of the holder enough.

Hardy rivet set for setting rivets.

My rivet set tool made from chunk of
½" steel welded to a bicycle pedal arm

My rivet punch



Shows how all of the tools work together. You can either use a ball peen hammer to flatten the end of the rivet or use the rivet punch shown above.
Once you have formed the rivet, place it upside down into the dimples in the rivet header. Then put the stock to be fastened over the end of the rivet and "smash" down the end of the rivet to complete the binding of any materials being riveted. Unless you do this often you are likely to find that the rivet loses it's heat before you can get it completed. What I do is put the rivet in the header, add the stock over the rivet, then I use my oxy-acetylene torch to reheat the tip of the rivet and then hammer it with the rivet punch forming the end of the rivet.






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