40@ MIK جامعة بيشة UNIVERSITY OF BISHA Faculty of Engineering Subject: Second assignment Instructor: Dr. Saad Khodir T Collage of Engineering Department of Industrial Engineering (Answer the following questions) الاثنین ۱۳ فبراير م Date: 8/7/1444 + L₁ D. L 2 Q1. Calculate the time required to machine a workpiece 170 mm long, 60 mm diameter to 165 mm long 50 Phim-diameter. The workpiece rotates at 440 rpm, feed is 0.3 mm/rev and maximum depth of cut is 2 mm. Assume total approach and overtravel distance as 5 mm for turning operation. Answer d Q2. A gray cast iron surface 280 wide and 540mm long may be machined either on a vertical milling machine, using a 100mm - diameter face mill having eight inserted HSS teeth, or on a horizontal milling machine using an HSS slab mill with eight teeth on a 200-mm. diameter. Which machine has the faster cutting time? The values of feed per tooth and cutting speed for both processes are 0.4mm/tooth and 80m/min, respectively. The depth of cut = 3.0 mm and assume A and O equal to 5. Answer ||:.. 1 / 4