In the attached GIF I need to remove the background inside the cartouche, leaving the letters raised. Pocket milling generates the tool paths OK, but, in order to get decent looking letters I need to use a small, 1mm, endmill. Doing the whole job with a 1mm cutter takes hours; the cartouche is 145mm long.
What I would like to do is remove the bulk with a larger endmill (3mm say), then machine the fiddly bits with the 1mm cutter without going over the sections already machined. Is there a way to do this without having to "mask off" the already machined bits?
TC21.2 x64 Plat, Bld59
TC16.2 Plat, Bld54.0