Cut this using the trial version of CUT3d. had to port it over to Vcarve pro because the output file from Cut3d gave a 'Line error' when opened in Mach3. Very strange because the output from Vacarve pro to Mach3 was fine.
I found that the 'cutout' path was not as good as I would have liked it. I stepped down 2mm at a time using a 4mm end mill to a depth of 20.5mm. Should I have done a profile pass after the cut out path.
Len-Tikular (A glider pilots dream cloud)