Chapter 32 Problem 4. (Build Cycle Time in Stereolithography) The square cup-shaped part shown is fabricated using stereolithography. The base of the cup is 35 mm on each side and 4 mm thick. The walls are 3 mm thick, and the total height of the cup = 50 mm. The SL machine used for the job uses a spot diameter = 0.25 mm, and the beam is moved at a speed = 1000 mm/sec. Layer thickness = 0.10 mm. Repositioning and recoating time for each layer = 20 sec. Compute an estimate of the cycle time to build the part if the setup time = 15 min. Figure for Problem 4. 1 50 Problem 5. (Cost per Piece in Additive Manufacturing) The cost of the stereolithography machine is $60,000 installed. It operates 5 days per week, 8 hours per day, 50 weeks per year, and is expected to last 5 years. Material cost for the photopolymer = $150/L. Assume that all of the photopolymer in the container that is not used for the part can be reused. Labor rate = $25.00/hr, but labor will be used for only 30% of the build cycle, mostly for setup. The post- processing time = 5.0 min/part. Using the cycle time of 3.27849 hr, determine the cost a part of volume 22564 mm.