The study on high speed machining was conducted for wing and rib parts of major structure in aircraft in order to investigate a optimal cutting condition and machining method using a high speed machine with 33,000 rpm. Preliminary tests, such as high speed cutter test and spindle vibration test of high speed machine, were performed and the high speed machining was conducted in 3 times after the preliminary test results were applied to a NC program for manufacturing. From this study, the following conclusions are drawn.
1) For the high speed machining, the incidence of defective products decreased and the productivity increased due to the decrease in deformation, compared to low and moderate speed machining.
2) The grain direction and proper finishing clearance of side and bottom side should be considered to determine the direction of progress of cutter.
3) The cutting conditions, such as feed rate per tooth (mm/tooth), removal of chip per minute (mm^3/min), depth of cut per 1 cycle, spindle speed, feed rat, etc., for each cutter were optimized.
4) Obtained results were applied to the NC program for high speed machining and the high speed machining was conducted for a practical product.