It turns out mass production is difficult, especially when unsolicited problems arise.
This week, we have been focusing on making our snap fits, overloading our stock line and our Bs. Below is chart of our tasks as well as the quantity that we need for the parts.
| Tasks | Quantities | Date Completed | Person |
| Manufacturing | |||
| IM B | 60 | 11/21/2018 | Nina |
| IM B overmold | 60+25 disturbed | Mitchell | |
| IM Stockline | 60 | 11/28/2018 | Susan |
| IM Stockline Overmold | 60+25 disturbed | Susan | |
| IM Snap Fits | 120+25 disturbed | Anna | |
| Thermoform Package | 70 | Jeremy | |
| Disturbed Body Parts | 25 | - | Mitchell/Susan/Anna |
| Assembly | |||
| Shafts/sliders/spacers | 70 | 11/28/2018 | Ethan |
| Assembled YoYo | ~60 | Everyone | |
| Documentations | |||
| Final Report | Everyone | ||
| Poster | Mitchell/Susan | ||
| Video | Anna | ||
| Blog Post | Ethan/Nina |
A. Snap Fit
We made our production run of 25 disturbed parts by allowing a piece of the part to get burnt.
However, we then struggled to remove this feature. We tried decreasing the injection pressure profile and the injection speed. That decreased the amount of burning but did not entirely eliminated it. We then continued decreasing the injection speed a bit more drastically in order to fix the defect. In doing this, the snap ring showed no defects associated to decreased injection pressure, and that is why we decided to continue tinkering with this parameter. What did finally work was scratching both the cavity and core in the area where the burn was occurring.