Friday, January 7, 2011

Phase 2 - refining the blanks

I am now at the stage where I am satisfied with the basic shape and can move on to the heat treating.
Because it is so labour intensive and messy for just 2 tools I am going to send these out.
Basicially the technique is to wrap the steel then slowly bring it up to a temperature where the metal becomes ductile and the grain structure can be re aligned. It is held at a specific temperature for 1-3 hours then slowly cooled and quenched in hot oil to give the metal the hardness and ductility required.
I am trying for a RH of about 6200.
Heres a shot of the tools ready for the heat bath:
<a href=" src="" alt="lathe-tools-7"></a>
Here's a close up showing the shape of the tips: The more finishing I do now the less labour intensive it is after heat treatment.
<a href=" src="" alt="lathe-tools-6"></a>
Finally here is a close up showing the taper I ground into the steel to allow the tool to pass through the kerf as it penetrates into the depth of the wood without binding. I wanted a strong tool so I made the depth 1-1/4" and the back is 1/8". I don't want any chance of it  bending in the cut at 300-500 rpm.
<a href=" src="" alt="parint-tool-1"></a>

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