Manufacturing Time Estimates

In order to make predictions for our Gantt chart, our team created some estimates for the yoyo manufacturing process. These estimates can be seen in the tables below:

In order to estimate the manufacturing times, we took all of the machining times for the molds from our Mastercam files for the lathe and mill procedures. We assumed that these machining times were accurate and that the total machining time for the molds will be a little over two hours. Then we considered the production time per yo-yo. Using the times given in lecture for injection molding, we approximated the molding time for each part (eight parts per yo-yo including both sides). We then used the information from lecture about thermoforming and the properties of the high-impact polystyrene to estimate how long the production of one thermoform part would take. The details of the steps in each of these production process that we considered are listed in the table of cycle times; we included machine set-up, actual molding, cooling, part ejection, etc. Although we will have four high-impact polystyrene parts on the yo-yo (two per side), we will only be thermoforming two of these. Finally, we figured we’d need about an additional two minutes per yo-yo for transport and assembly. This left us at a production rate of about one yo-yo every ten minutes

Because the gantt chart was created at the same time as these estimates, it doesn't really affect our estimated manufacturing times. However, all our molds were not finished by the end of this week, so we did have to change our gantt chart to reflect that change.