I have used a cut-off wheel to cut 10mm copper.
Used a drillpress with X-Y table instead of dremel though. Discs were of the reinforced 38mm kind and held in place by a cut M8 bolt with a M4 bolt threaded into one end. Used about 3000 RPM
Main problem using a dremel is that its easy to get the wrong angle and then the disc breaks.
|