This study discussed what rotary ultrasonic machining (RUM) and tool geometry parameters combination can obtain bigger material removal rate (MRR) in drilling. The experimental configuration of this study was planned using Taguchi orthogonal array, where the drill diameter, rotation speed, power and feed rate were taken as the experimental factors. A relation model among the MRR and standard deviation of the holes walls and processing parameters and tool geometry was established, so as to achieve maximum MRR of the overall deep holes walls. The experimental results proved that application of the optimized parameters combination in rotary ultrasonic machining of holes processing can obtain bigger and better removal rate of holes walls. The effect of control factors on the holes quality was discussed from the straightness deviation and maximum material removal rate of related factors on the holes when the Taguchi method was used in rotary ultrasonic machining of holes drilling. The results showed that rotation speed, power, and feed rate under bigger level have a larger MRR than that of other level in a fixed drill diameter.

In the design and analysis of motors, the issue of heat transfer is an important subject because it is relevant to the motor’s size and life. So, this study used an experimental design with the Taguchi Method to understand performance of epoxy resin on permanent magnetic brushless motors with 240 coils. The objects used for the experiment were a permanent magnet brushless motor with a 240 coiling number and a potting compound. The experiment was conducted to explore effectiveness of potting to reduce temperature. The Taguchi Method was applied to determine the optimal sample combination to obtain maximal experimental effectiveness by minimal test frequency. The results revealed from this study were positive for potting compound to transfer heat.