Commit 9543f58c authored by Jake Read's avatar Jake Read

new cad is new

parent 339dedb8
# micro Stress vs Strain Machine
## Progress
## Dedicated uSSM
Here I'm using some
- Ballscrews, SFU2005 C7 700mm Long [ebay, $150](https://www.ebay.com/itm/SFU2005-Rolled-Ballscrew-C7-Anti-Backlash-Ballnut-L300-350-400-450-500-600-1000/202274175696?hash=item2f187afad0:m:m2SEqt9q_ykYYkrO5ZM9deA:rk:1:pf:0)
- Nema 23 Motors w/ .25" Shaft
- - x -
- GT2 5mm 12mm Bore Pulley 28T for 15mm Belt 'A 6A55M028DF1512'
- GT2 5mm 12mm Bore Pulley 38T for 15mm Belt 'A 6A55M038NF1512'
- *pick* GT2 5mm 12mm Bore Pulley 48T for 15mm Belt 'A 6A55M048NF1512'
- GT2 5mm 6.35mm Bore Pulley 12T for 15mm Belt 'A 6A55-012DF1508'
- *pick* GT2 5mm 15mm Belt with 55T 'A 6A55M055NF1512'
![img](images/uSSM-detail-two.png)
End of the line here is (1) to do small-scale material testing, OK. Next step is (2) to automate material search, doing a kind of real-time simplex where function evaluation is testing and DOF are process and recipe parameters. This is a cohesive, realizeable story.
I would like to know:
- evaluation: pick: Stiffness and Tensile Strength? some weighted score from both?
- inputs: if we are to pick, say, 3 process parameters (to have 3D search space), what are they?
## Next Steps
- fab this thing
- finish waking up new network, new stepper boards / code
- finish hello-world CV on markers
- plot a stress/strain chart
- show high resolution stress / strain measurement w/o high stiffness machine
- show machine reference via known material?
## Generalist does uSSM
To test requisite parts for a small stress and strain machine, I attached some jaws and a load cell to [this 'generalist' machine](https://gitlab.cba.mit.edu/jakeread/mothermother).
......@@ -14,14 +43,13 @@ I used [automatakit](https://gitlab.cba.mit.edu/jakeread/automatakit) network co
![gif](video/first-pull.mp4)
Probably the most interesting point is that Sam and I have decided to try using a webcam and some computer vision to track the position of the speciment endpoints. He's done some prior work, [here](https://gitlab.cba.mit.edu/calischs/subpixel_tracking).
Probably the most interesting point is that Sam and I have decided to try using a webcam and some computer vision to track the position of the specimen's endpoints. He's done some prior work, [here](https://gitlab.cba.mit.edu/calischs/subpixel_tracking).
## Next Steps
![transform](video/ussm-from-mm-enc.mp4)
- wake up ADC / find external high resolution ADC
- hello world computer vision on markers
- show high resolution stress / strain measurement w/o high stiffness machine
- show machine reference via known material?
# Microphone Stiffness Testing
[Alisya did this in FabAcademy](http://archive.fabacademy.org/2017/fablabsantiago/students/356/project.html) and it would probably be a fun piece of kit / example for the NIST Project. Looks pretty simple... and compelling.
# Design Spec / Notes
......
Jake
JARVIS-THINKPAD
Thursday, January 24, 2019
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