Commit 2b3eae55 authored by Charles De Mey's avatar Charles De Mey
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......@@ -41,7 +41,6 @@ Overall, we observed impressive results from the various test prints that we con
### Experiences with overhangs, bridging & surface finishes
In the overhang, bridge, and surface tests, we again observed impressive results.. The overhang performance performed impressively, reaching 70 degrees before our print quality deteriorated. Since the overhang test went well, the bridging test also did pretty well. On the other hand, the surface test did not yield impressive results. It was apparent that the nozzle left behind lines on previous layers due to scraping. As a result, the final print was left with a checker board pattern that was left behind, leaving the infill visible due to the lack of a solid, smooth surface on the final layer of the print.
![](../images/week03/group1.jpg){width="300px"}
![](../images/week03/largetest.jpeg){width="300px"}
<figcaption>Overhang, Bridging, Surface, and other test</figcaption>
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......@@ -4,7 +4,7 @@ This group includes [Teddy Warner](http://fabacademy.org/2021/labs/charlotte/stu
## Brainstorming
It actually took a a little while to decide what the focus of our project would be. We decided to make a pizza-making machine since almost everybody loves pizza. The basic idea is that we will have two tools, a sauce dispenser and a cheese dispenser. [Last year's group machine]((http://fabacademy.org/2020/labs/charlotte/groupasswk17.html)) was similar with the technique they used to dispense the cupcake batter, but ours is more complex. This is becuase we incorporated tool changing as well (switiching between the sauce and cheese hoppers) which forced us to rethink how we were going to mount the different hoppers. For the movement of the gantry and hopper, we decided to build a standard CNC with an X-axis, Y-axis, and Z-axis. The motors we used for each of these axis are stepper motors similar to the ones on 3D-printers. For opening and closing the hoppers to control whether the elements would go through, we used a small servo motor on each of the hoppers. We need to rotate the bottom cover very little, so this was the best solution. It is also easier to write programs for the servo motors than it is for the stepper motors so there was no reason not to use servos.
It actually took a a little while to decide what the focus of our project would be. We decided to make a pizza-making machine since almost everybody loves pizza. The basic idea is that we will have two tools, a sauce dispenser and a cheese dispenser. [Last year's group machine](http://fabacademy.org/2020/labs/charlotte/groupasswk17.html) was similar with the technique they used to dispense the cupcake batter, but ours is more complex. This is becuase we incorporated tool changing as well (switiching between the sauce and cheese hoppers) which forced us to rethink how we were going to mount the different hoppers. For the movement of the gantry and hopper, we decided to build a standard CNC with an X-axis, Y-axis, and Z-axis. The motors we used for each of these axis are stepper motors similar to the ones on 3D-printers. For opening and closing the hoppers to control whether the elements would go through, we used a small servo motor on each of the hoppers. We need to rotate the bottom cover very little, so this was the best solution. It is also easier to write programs for the servo motors than it is for the stepper motors so there was no reason not to use servos.
## Designing
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