Here's what I contributed to my team.
2018-06-25
Arushi, Ben, and I used the measurements that I gathered from the previous days and compared the scales between the three models we had: the green conceptual design from the Swedish team, the full-scale bogie model's placeholder cart, and the current small-scale iteration of the pod car.
We determined that the average small-scale to green design dimension ratio was 1:14.84, and the average small-scale to full-scale placeholder dimension ratio was 1:10.8. The average of these two ratios is 1:12.8, which wouldn't be a nice number to work with.
My team and I created a true 1:10 scale cardboard cutout of the dimensions we measured of the green conceptual design. We also created the average US male and female heights, about 5' 10" and 5' 4" respectively [1]. We made 40 cm x 50 cm scaled-down "seats" as well.
It's good to know that we've finally figured out how big we're going to make the cabin.
2018-06-26
I found the American Public Transit Association's Standard Bus Procurement Guidelines [2][3], and used those to find out how tall the cabin's interior really should be: APTA bus guidelines state that the bus must have an interior headroom of 74 inches the back, and 78 inches in the front. 78 inches is close to 200 cm, and the green model's exterior height wouldn't fit within that standard.
The four of us also thought of how we would put a bike into the cabin, with concepts including:
- Putting the bike behind the seats
- Moving the door to one side to allow enough space for a bike rack
- Having a foldable part of the cabin extend to hold a bike
- Using foldable seats for more bike space.
Daniel found some articles on the ergonomics of personal rapid transit [4][5][6][7][8], while I focused on checking our 3D printers' printing error.
I used our lab's Prusa i3 Mk2 3D printer to print a small 25mm cube with a 15mm diameter hole. Below is a picture of the Prusa printer mid-print. The test cube's X- and Y- dimensions were at most 0.09 mm larger, but the Z-dimension was 0.25 mm larger. The inner diameter hole was 0.66mm smaller. This might cause some trouble with making joined pieces, but we can fight that error with well-designed pieces and extra contingency.
The Lulzbot TAZ wasn't calibrated properly, so I didn't test it yet.
2018-06-27
Arushi, Ben and I did some more measuring: this time it was the usable seats that were in one of the first concept designs for the Superway. After measuring, I created a 10:1 scale design that we could use that would be ready to print easily. However, during the print we noticed that the whole entire 1/10 scale would be too big for the Prusa printer to make on its own, and canceled the print.
I found my 3D-printed model from last year.
With some quick Google Sheets equations and locked cell references (shortcut is F4), I created a scale chart with possible dimensions all from 1:1 scale to 1:25 scale. basing our measurements off of the scaled green model 20th scale, we made a conclusion.
It's good to know that we've finally figured out how big we're going to make the cabin.
2018-06-28
I found Solidworks CAD files of all of the hardware parts used on McMaster-Carr, and started to write this blog post.
I also taught Arushi how to use the 3D printer and Cura, the software we use to turn STL files into GCODE files for printing. We printed a small file that she had been working on for SolidWorks practice.
I checked over what we had to do next week and started adding the parts we need to our Bill Of Materials (BOM). Since we're the small-scale team, most of the parts we need -- screws, nuts, bolts, filament, and so on -- are easy to find and already provided here.
I updated the Trello page we had to reflect on what we had done during these four days. I'm looking forward to next week, Finalize Week.
Sources
I will eventually compile these into MLA citations for our presentation, but for now here are the direct links.
- [1] https://www.firstinarchitecture.co.uk/average-male-and-female-dimensions/
- [2] http://www.apta.com/resources/reportsandpublications/Documents/hfdiesel.pdf
- [3] http://www.apta.com/resources/reportsandpublications/Pages/BusParatransit.aspx
- [4] https://waset.org/publications/10008176/analysis-of-train-passenger-seat-using-ergonomic-function-deployment-method
- [5] http://www.diva-portal.org/smash/get/diva2:832377/FULLTEXT02.pdf
- [6] https://www.iosh.co.uk/~/media/Documents/Networks/Branch/Edinburgh/Vehicle%20ergonomics%2011Oct12.pdf?la=en
- [7] https://www.recovre.com.au/wp-content/uploads/2014/08/Vehicle-Ergonomics-Fact-Sheet.pdf
- [8] http://www.wt.pw.edu.pl/content/download/2836/17245/file/Z98-art_8.pdf
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