In a piece of aluminum, a 15 mm wide groove with a length of 1.5 m and a cutting depth of 5 mm must be made, due to the characteristics of the material it is recommended to have an advance of 250 mm / min, and a cutting speed of 45 m / min. if roughing is done with a 15 mm diameter end mill tool, calculate the following: a)- the rpm necessary to have a good finish, b) -the cycle time in seconds to perform the machining. c)- the volume of chips removed per minute.