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This paper investigates the effect of minimum quantity lubricant (MQL) on the surface roughness of titanium alloy Ti-6Al-4V ELI when turning using uncoated tungsten carbide tool. The response surface method (RSM) design of experiment using Box-behnken was used to accomodate the turning experiment factors and levels. Turning parameters studied were cutting speed (100, 135, 170 m/min), feed rate (0.15, 0.2, 0.25 mm/rev) and depth of cut (0.6, 0.8, 1.0 mm). The results show that the feed rate was the most influence factor controlling the surface roughness produced. The feed rate (F) was found directly proportional with the surface roughness value (Ra) but inversely proportional to the cutting speed (Vc). MINITAB software was used to develop a surface roughness model, and the optimum condition was at 160 m/min of cutting speed, 0.18 mm/rev of feed rate and 1 mm of depth of cut. At the optimum condition low value of 1.54 μm surface roughness was obtained.

ofTokUshima ， 1耐 血 te ofTechnology and Science Minami ・ Josanj ima 2 − 1， To shima − shi， To shim 亀 770 − 8506 Japan The tool pe 曲 ce of 皿 co 劇 cabide 画 GG l20408 − SGF − H13A， i 鰤ing the titanium alloy Ti ・ 6Al4V ELI with 32 HRC was invostigated ． The o 切 ective of this study is to 血 ves 口 gate the tool wear progression during 丘nish 加m 血 gof 血 e titanium al1 ( ) y using different combinations of cutting parameter values ． A high cuning speed range for 止e し mcoated carbide insert was used to cut Ti ・ 6AI ・ 4V ELI under flooded conditions ． The cutting parameters were chosen based on the expei ental design ． In 画 cu1π ， the Box − Be ken d雛 ign鄲 鵬 d to d創em 血 e 17 parameter combinations ． The 廿皿 ee main f 加 tols considered were t血 e cutting speed ， feed rate ， and depth of cut ． The cuUing speeds were l20 ， 170 ， and 220 曲 血 ； 出e 勧 values w 釘 e O． 1， 0． 15， and O． 2 mm ！ rev；and the depths of cut were O． 4， 05， and O． 6 ． The res曲 show that the cutting sp θed had the greatest effect on the tOol life ， fb 且 lowed by the feed rate and dqpth of cut ． The optimum combination

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Abstract. In orthopaedic surgery internal fixation of bone fractures using immobilization screws and plate is common procedure. This surgical procedure involved drilling into bone and fixative components interaction. Many problems are encountered with the bone drilling process such as holes accuracy, drill wander and excessive heat generation which were directly related with the drilling parameter. This paper investigates the effect of drilling parameter namely spindle speed and feed rate on the cutting force and surface roughness performance. Design of Experiment (DOE) historical data of Response Surface Method (RSM) were adopted to evaluate the correlation between the cutting parameter and the holes performance. From the conducted investigation, the most significant parameter that affect the holes performance was spindle speed followed by the feed rate. In addition, the interaction between feed rate and spindle speed also controlled the holes performances.

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