programs using small cutters

[dek]

Does anyone know the best way to machine a rib around a component (mould tool) 10 m/m deep (ruf 3/8) bottom of rib 1.8m/m wide(70thou) and 2m/m at top (80thou) total distance around component about 16 inches . the machine is a hardinge bridgeport 5 axis (i dont know how to use 5 axis just 3) we limit rpm to 12000 . the software we have is powermil i have looked at gwizard to get speeds and feeds the one i have selected is 12000 rpm .05m/m (2thou D.O.C.) and a feed of 344 m.p.m. 2 cavities to be machined , i used profile raster machine to ruf out to size as this took so long to m/c to do away with finnishing .| used a 1.5 m/m dia cutter which i modified to get the length the material is 01 .It just seemed to take forever.