A hole in 30 mm thick casting is 20 mm in diameter and is to have a 4.5 mm deep, 3 mm wide keyway broached in it.

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A hole in 30 mm thick casting is 20 mm in diameter and is to have a 4.5 mm deep, 3 mm wide keyway broached in it. The average amount of material removed by each teeth is 0.075 mm. If the pitch of broach tooth is 12 mm, how long will be cutting portion of the broach have to be ? How long will it take to breach 1000 parts if the broaching speed is 10 mpm. The total time allowed for return stroke, handling each part and placing the broach in position for the cut is 1.5 minutes.

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