Question

Calculate the MRR for milling a rectangular workpiece of length 250 mm and width 60 mm by a plain milling cutter of diameter 66 mm, length 80 mm, and 10 teeth. The cutting velocity is 60 m/min, the depth of cut is 3 mm, and the feed is 0.15 mm/tooth.

Answer 1

The question asks for the calculation of the Metal Removal Rate (MRR) during milling. The MRR is calculated using the width, depth of cut, feed rate, and cutting speed. These variables are combined according to the MRR formula to find the answer.

Step-by-step explanation:

The subject of the question is related to the field of manufacturing and machining processes, specifically the calculation of Metal Removal Rate (MRR) during the milling operation. To calculate the MRR, we use the formula MRR = width × depth of cut × feed rate × cutting speed. In this case, the width of the workpiece is 60 mm, the depth of cut is 3 mm, and the feed per tooth is 0.15 mm/tooth.

The cutting speed (V) is given by the circumference of the milling cutter times the number of revolutions per minute (rpm). Since the diameter of the cutter is 66 mm, the circumference is π × 66 mm. To find the rpm from the cutting velocity, we use the formula V = π × D × rpm. Upon finding the rpm, we can then calculate the feed rate by multiplying the number of teeth by the feed per tooth and the rpm. The final step is to compute the MRR using all the values obtained.