[modeleng] Fw: Trepanning(?) copper

Stupid me - I should have said that the material is copper!!


----- Original Message ----- 
From: "Dennis Rayner" <dennis.rayner@xxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Tuesday, August 31, 2004 8:00 PM
Subject: [modeleng] Trepanning(?) copper


> 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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