There always seem to be a pesky know it all radio control modeller type person around when you need them least . In an attempt to answer a question to one of these exalted beings, I embarked on the next little adventure:
I tried cutting 3mm balsa using a HSS 2mm slotdrill at 30000rpm. The cutter did not even realise the balsa was there. Very chuffed.
Also interesting was the route to reach the toolpaths. I hand-sketched the shapes, scanned to bmp, converted from raster to vector, did a very precursory clean-up of the dxf in draftsight, and imported into alibre for the cam work. Sounds complicated but took a few minutes because all the steps worked.
Have a look at draftsight by the way. It is from dassault systemes, a completely free update of the old dwg editor, and works magically for 2d stuff, which is something without which any cnc router operator cannot get along.
By the way, I also cut just into the surface of a 6082-t6 alum plate with the same cutter to see what it would do, and the results warrant further investigation. Nice diversion.