An Experimental Research on Surface Roughness of Fine
POCO EDM3 and POCO EDMAF5 finegrained graphite were adopted as workpiece material. A full groove milling was performed respectively using a tungsten carbide end mill with or without diamondcoating dedicated to graphite cutting. EDMAF5, which has a smaller grain size than EDM3, showed better property for surface roughness. The diamondcoated tool demonstrated more excellent abilities