An open-side planer is used to plane the top surface of a rectangular work part that...

 

Transcribed Image Text:

An open-side planer is used to plane the top surface of a rectangular work part that is 20.0 in by 45.0 in by 5 in thick. The part is made of carbon steel with a tensile strength of 50,000 Ib/in and a Brinell hardness of 110 HB. Cutting speed = 30 ft/min, feed = 0.015 in/pass, and depth of cut = 0.250 in. The length of the stroke across the work must be set up so that 10 in are allowed at both the beginning and end of the stroke for approach and overtravel. The return stroke, including an allowance for acceleration and deceleration, takes 60% of the time for the forward stroke. How long will it take to complete the job, assuming that the part is oriented in such a way as to minimize the time? (8 marks) An open-side planer is used to plane the top surface of a rectangular work part that is 20.0 in by 45.0 in by 5 in thick. The part is made of carbon steel with a tensile strength of 50,000 Ib/in and a Brinell hardness of 110 HB. Cutting speed = 30 ft/min, feed = 0.015 in/pass, and depth of cut = 0.250 in. The length of the stroke across the work must be set up so that 10 in are allowed at both the beginning and end of the stroke for approach and overtravel. The return stroke, including an allowance for acceleration and deceleration, takes 60% of the time for the forward stroke. How long will it take to complete the job, assuming that the part is oriented in such a way as to minimize the time? (8 marks)