, 02.12.2019 22:10 jetblackcap

# "(uscs units) fused deposition modeling is used to fabricate a part which is a model of the step pyramid at sakkara in egypt (built circa 2670 bce). the model has six levels or steps, each with a thickness of 0.17 in. the bottom layer = 2.20 in on a side, and successive levels are 1.85, 1.50, 1.15, 0.80, and 0.45 in on a side, respectively. height of the pyramid = 1.02 in. in the fdm process, layer thickness = 0.010 in and the width of the extrudate deposited on the surface = 0.025 in. the extruder head moves in the x-y plane at a speed of 10 in/sec. a delay of 12 sec is experienced between each layer to reposition the worktable. compute an estimate for the time required to build the part. setup time = 35 min. ignore post-processing time. using the time estimated to build the part, determine the part cost (in \$) if the abs polymer used in the process costs \$9.50/lb and its density = 0.038 lb/in^3, machine hourly rate = \$8.00/hr, and labor rate = \$30.00/hr but labor will be used only 40% of the build time, mostly for setup

### Another question on Engineering

Engineering, 03.07.2019 12:20
Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240Â°c (superheated state), respectively. then the temperature drops to t2= 100Â°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240Â°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100Â°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.