No abstract

No abstract

No abstract

No abstract

In the present research ， a ultra − precision diamond cuttihg ofthermo ・ p ］ astic mat ¢ ria！ s， polycarbonate ( PC ) and cyclic o ) efin po ｝ ymer ( ZEONIX ) ， is carried out by applying a method named ultrasonic elJiptical vibration cutti口g developed by the au 重 hors ， It is experimenIa ］ ly proved that good ． optical surfaces are obtained by applyjng the elhpticaI vibration cutting in cases of ' machining of symmetrical and dissymmetrical V grooves as compared with the conventional diamond cutting ． The surface roughness of dissymmetrical V grooves obtained by the ultrasonic elliptical vibration cutting is 10nmRz and 41 nmRz fbr PC and ZEONEX ， respectively ，