Four identical slots were machined out of a block of aluminiumas shown in Fig. 1. Slots were cut by the same tool and the samespindle speed. The final depths of slots were all the same and equalto 12 mm. The slots were cut in multiple passes with each slotbeing cut as a result of passes of the same depth. The number ofcuts N, and their depths of cuts h, for each slot were calculatedsubjectto the condition thatthe final depth ofthe slots was 12 mm.Therefore,Nh ¼ 12 mm (9)Additionally, the feed rates f, were calculated in a way to keepthe total cutting time of slots equal.Nlf ¼ cte (10)With l being the length of the block and slots. Eq. (10) can bewritten as:h f ¼ cte (11)The feed rates, depths and number of cuts for each slotin the caseof finishing are given in Table 2. The same sets of data for the case ofsemi finishing are presented in Table 3. These were chosen to beconsistent with conditions in Eqs.(9) and (11). A list ofthe definitiveelements ofthe experiment set up, e.g.machine tool, material, etc., isshown in Table 4. The total consumed power of the machine wasmeasured during the experiment at the electric power entry of themachine. Since the feed rates and depths of cut were designed tomake the total cutting time of all slots equal,the total energy used tocut each slot is proportional to the average power consumption ofthe machine while cutting that slot. Therefore, any differencebetween the power consumption of the machine during cuttingdifferent slots can be translated into the same difference in totalenergy consumed to cut those slots. The results of these sets ofexperiments are discussed in the next sections.