Roughness Level Analysis of the Surface of Plastic Material from Turning Machinery Process

The objectives of the research are to obtain the roughness surface level of plastic material resulted from turning process and to find out the effect of some elements of the machinning process to the surface roughness level. The material used are thermoplastic type which consist of polypropylene (PP) and polyvinilcloride (PVC), while the thermosetting plastic is consist of unsaturated polyester resin (UPPRs). The research design is divided into four steps; forming raw material, turning the specimen and roughness test and result analysis. PP and PVC specimens are formed with extrution machine and UPRs castingly. For each type of plastic is formed two specimens with dimension of empty set25 mm 90 mm. The specimen are being turning gradually for 15 mm length. Machinning parameters are confined to 5 mm/sec feed with depth of cut 0.4 and 0.2 mm and speed are 350 rpm, 450 rpm, 550 rpm, 650 rpm, 750 rpm and 850 rpm. The result of the research shows the level of surface roughness of the plastic materials PP, PVC and UPRs had to decrease after the turning process. The level of surface roughness of these material after turning process around at the level N7 and N8. The machinibility of materials PP better than the PVC and UPRs materials.