Specimens of 6061 Aluminum alloy were prepared and quenched in water, sheanut oil and palm oil at temperature of 400 o C, 450 o C and 530 o C to determine the effect of variation in temperature and quenching media on some mechanical properties and the microstructure of the alloy. Standard specimens from the rapidly quenched alloys were subject to various tests to determine their ultimate tensile strength, hardness and impact strength. The results showed that the specimen heat-treated to 530 o C and quenched in water has the highest tensile strength of 109 N/mm 2 and yield strength of 70.89 N/mm 2. The specimen heated at 530 o C and quenched in water gave the highest value of 35.50 in hardness (HRC). The toughness property of the alloy, as indicated by Charpy impact values, is better at 530 o C for specimen quenched in sheanut oil and least impact strength is observed in specimen quenched in water at 400 o C.

Machining operation is affected by some factors, either positively or negatively such as coolant, tool geometry, type of tool, tool angle, depth of cut, cutting speed, size chip, cutting rate, type workpiece, etc. This experiment was designed to turn five pieces of mild steels rod of 22mm in diameter to a diameter of 20mm as the targeted final diameter of each work piece. The parameters used for the experiment were coolant, depth of cut, feed rate, and cutting speed, the outcome to be tested were dimensional accuracy. Two values were assigned to each of the parameters except coolant which was maintained at 15cl throughout the experiment and cutting speed has four values. A 2 k factorial design with 5 parameters was adopted, of which some of the factors affected the dimensional accuracy seriously. Comparing the tabulated value of f o with the calculated values it was find out that f 0.01, 1, 32 = 7.50. So it mean that the H o hypothesis is rejected in the case of B,