UMEROUS non-traditional methods such as electro-
discharge machining (EDM) and laser machining, have
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been developed to process machine parts precisely and
efficiently. However among these, Ultrasonic-Assisted
Grinding (UAG), in which the machine tool (grinding wheel)
or the workpiece is vibrated at ultrasonic frequencies, has
been widely used especially for the machining of difficult-to-
cut materials such as ceramics and glasses. The benefits
include significantly increased rates of material removal,
decreased grinding forces, reduced grinding wheel wear and
improved surface finish. Vibration-assisted grinding was
examined by Wang et al. and based on the fact that ground
surface texture has dominant roughness in the cross feed
direction [1], [2]. The results showed that the ground surface
roughness improved both in feed and cross feed direction and
the grinding forces decreased. UAG is regarded as one of the