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Old 12-26-2011, 08:24 AM
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S10xGN S10xGN is offline
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Riv-nut Tool...

Hi guys!

Made a new tool over the weekend, a hydraulic press for clinching "Riv-nuts" that are beyond the size capacity of a hand-plier, to be used with my existing HF 4 ton press kit. My hand tool will only do up to #10, anything over that required a "stud, nut, and washers" rig that uses bolt rotation to clinch them. If you've ever done this, you know what p-i-a that can be! I found a small "Enerpac" hollow cylinder on E-Bay ($75), bought a set of mandrels from McMaster-Carr ($13 ea), and made the remaining parts on my old pre-war Atlas lathe. The nosepiece is threaded 3/8-16 to screw into the cylinder, bored 1/4" through and is 3/4" OD x 7/8" long. It is used alone for the 3/8" mandrel and riv-nut. There is a 1/8" spacer for use with the 5/16" rig and that spacer plus an additional 3/16" spacer for the 1/4" rig. The smaller sizes are easy, but the 3/8" nuts takes a pretty good amount of "arm" to press them. I made these pieces from aluminum because I had the stock, but the nosepiece would ideally be from steel, as once the ID is bored, there is only 0.020" wall thickness to the thread's root diameter! It can only work if the nosepiece is screwed flush to the piston so the force is not on the threads...

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