Vahid Khademi
Javad Akbari
Farzam Farahmand

Ultrasonic Assisted Drilling (USD) is new technique to drill difficult to machine materials. In this method, tool or workpiece vibrates with amplitude of few microns in addition to conventional drill bite rotation. In this experimental research, the bone was drilled both conventionally and using UAD, then the thrust was measured in two methods at feed rates of ۵۰, ۷۵ and ۱۲۵ mm/s and ۵۰۰, ۷۱۰ and ۱۰۰۰ RPMs. The results show that USD method causes the thrust force decreases considerably in compare whit conventional drilling. The maximum temperature is less in USD at low RPMs.