Aiming at the problems in the processing of carbon fiber reinforced polymers (CFRP)

the rotary ultrasonic drilling has been carried out on CFRP-T700 composites with the abrasive trepanning core tool. From the graphical analysis

the cutting force has been found decreased with the increase of spindle speed whereas the corresponding torque has been found increased with the increase of spindle speed. The decrease in cutting force and the corresponding torque values has been found up to 56.6% and 39.1%

respectively in comparison with conventional machining. The mathematical relation of the cutting force and the torque has been been developed. The proportionality constant

k has been found between the cutting force and the torque has been found experimentally. The rotary ultrasonic drilling with trepanning tool is the essential need to reduce the cutting force and torque for machining of CFRP composites. This research can be applied for practical machining at the industry level.