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 > > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email to, > modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line. > MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.