[modeleng] Re: Question

Thanks to all those who responded to my question about brazing tool steel. 
In the end, it being the weekend, and not having the right size silver 
steel available to forge a tool, I followed the suggestion of mounting the 
tool in a piece of steel and using a setscrew. It's worked a treat! A very 
non standard thread - metric form, 1mm pitch, 21mm diameter. Of course, 
making the tool holder for the inside thread tool from available stock, 
and making a fixture to grind the tools for both inside and outside 
threading to the correct angle meant that there was a day and a half 
making tooling and half a day turning and threading. Why do these things 
always seem to take longer than one would think?
Still, it impressed the wife. She said that the only time she tried 
screwcutting in the lathe, it was a disaster....

It's for a special test fixture for work. In theory, it ought to be 
possible to find some local jobbing engineering shop to do these jobs, but 
in practice, it's easier to do it myself. It takes the facilities of the 
home workshop, since we don't have the tools at work......One other 
problem is when I specify a particular material such as PTFE (Teflon in 
the US). Your jobbing workshop doesn't have any, but PTFE is white 
plastic, isn't it, and they've got some of that. Results are disastrous 
because the PTFE was specified for its electrical properties......

Peter Chadwick
Swindon

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