To calculate the net cash flow over the life of the scanner, we need to consider the operating costs, salvage value, and labor cost savings.
Net cash flow = operating costs - salvage value + labor cost savings
Operating costs per year = 655,500
Operating costs over 5 years = 655,500 * 5 = 3,277,500
Net salvage value = 130,000
Labor cost savings per year = 1,700,500
Labor cost savings over 5 years = 1,700,500 * 5 = 8,502,500
Net cash flow = 3,277,500 - 130,000 + 8,502,500 = 11,650,000
To determine the time frame for recouping your investment, we need to calculate the payback period.
Payback period = Initial investment / Net cash flow per year
Initial investment = 1,308,900
Net cash flow per year = labor cost savings per year - operating costs per year
Net cash flow per year = 1,700,500 - 655,500 = 1,045,000
Payback period = 1,308,900 / 1,045,000 = 1.25 years
If the interest rate is 15% after taxes, the discount payback period can be calculated using the following formula:
Discount payback period = Payback period / (1 + interest rate)
Discount payback period = 1.25 / (1 + 0.15) = 1.09 years
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1) What two measures are used in rating the size of an injection molding machine?
2) What is packing the mold and why is it important in obtaining good injection molded parts?
3) How does high crystallinity in a resin affect the way the resin is injection molded, including any post-molding operations that might be done?
4) Why is it important to have the sections of the molded part as uniform in thickness as possible?
5) Assume that you are assigned to determine the minimum clamping force for a part to be molded out of polystyrene. The part cross-sectional area is 10 x 14 inches. What is the clamping force required if as a general rule, 2.5 tons of force are needed for each square inch of cross-sectional area?
6) Why is low specific heat capacity desired in a mold cavity material for some applications and a high specific heat capacity desired in others?
7) What feature in a mold will allow a hollow, cylindrical part to be made? Why are injection molding machines not as effective for mixing additives or other resins as are traditional extrusion machines?
8) What is a vent in the mold, what problems are prevented by the presence of a vent, and what parameters control its size?
1) The two measures used in rating the size of an injection molding machine are the clamping force and the shot capacity. The clamping force refers to the force exerted by the machine to keep the mold closed during the injection process.
2) Packing the mold involves applying additional pressure to the resin after the injection phase. This is done to ensure that the mold cavity is completely filled and that the plastic material is properly packed within the mold. Good packing is important because it helps to eliminate voids, reduce shrinkage, and improve the overall strength and quality of the injection molded parts.
3) High crystallinity in a resin affects the injection molding process and post-molding operations. Resins with high crystallinity tend to have slower melt flow rates, requiring higher processing temperatures and longer cooling times.
4) It is important to have uniform thickness in the sections of a molded part to ensure consistent cooling and minimize the risk of defects.
5) To determine the clamping force required, we multiply the part cross-sectional area (10 x 14 inches) by the general rule of 2.5 tons of force per square inch.
6) Low specific heat capacity is desired in a mold cavity material for some applications because it allows for faster cooling and shorter cycle times.
7) A feature in a mold that allows a hollow, cylindrical part to be made is called a core. The core creates the internal cavity of the part while the mold cavity forms the external shape.
8) A vent in the mold is a narrow gap or channel that allows for the escape of air, gases, or excess material during the injection molding process. It helps to prevent issues such as air trapping, burn marks, and incomplete filling of the mold cavity.
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