BP1013 Tungsten Tools

I saw that there is some interest about the subject so I have decided to make a small Blueprint about.

Box with tungsten bars that were collected and brought to me by my younger students from the exercise of tank (armored) combat training fields. This is my source of tungsten. The other source is from the factory that produces the tungsten for my experiment (free of charge)

I put the mandrel with ''hot fit'' the specific gravity of the tungsten is 2.5 times more then steel and the shrink expansion factor of steel is 0.00000635 x temp f degrees x od or length in thou'' in 1850 degrees it is 1.2% the factor for tungsten is half ! So when I put the mandrel on the tool with the ''hot fit'' I calculate exactly the differences between them for the temp of 1500 degrees. And when the mandrel shrinks it holds very very tight. The beauty is that when I want to take it apart I heat it more and because the difference of expansion it will release and the tools will go apart easy.

After I put the mandrel on I can catch the tool on the frizer and work it to the right measurements (on the lath or frizer you cut with ''vidia'' or ''carbides'' bits). You can see on the tool the marks of the frazing. The same I do with the smaller od tungsten.