Thursday, April 3, 2014

Nauman Sinus Punch


I came across these tools which haven’t been called for in quite a while, but when the opportunity arises they are really handy.  I learned this technique from Dan Nauman at a BAM meeting several years ago.  When I got home I made my own tools.  Three were made from coil spring and one was an Allen wrench as I recall.

The pattern I tested came from Dan’s demonstration.  The printed copy is glued to the sheet metal with rubber cement.  I had an ash log just the right height for working - about vise top height.  As soon as the tools were made I tried them out.

I have forgotten the gauge of sheet I experimented with but I think it was 16 gauge and the holes punched easily and cleanly with the slugs sinking into the end-grain surface.  I thought it was a lot faster and more fun than drilling if there were a lot of holes to make.  

The shape of the cutting edge of the punches is important as well as their sharpness.  I don’t know the upper limit of metal thickness for this technique but I’g going to guess that above 14 gauge it would be better to go to a mechanical punch or to drill.

See Dan’s work here:






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