[modeleng] Re: Trepanning(?) copper

Dennis, I use the same "grind" on tools I use for
Copper that I would use on Steel---with lots of
lubricant.

Al Messer
--- Dennis Rayner <dennis.rayner@xxxxxxxxxxxx> wrote:

> Hi all,
> 
>     I'm cutting 5+" and 7+" circles out of the front
> and back smokebox
> plates for my Elidir. I'm using my Dore Westbury
> with a boring head at
> lowest geared speed believed to be about 34 rpm.
> 
>     A simple question - what top rake should the
> cutting edge (a miniature
> "parting" tool) be? Currently I'm using zero (as per
> brass) and it don't
> seem happy!
> 
> Thanks as ever
> 
> Dennis
> 
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