stash before rename and cleanup

LOG.md

+## DEX
+
+Re-did the machine last week, now much simpler:
+
+![dex](images/2019-09-27_DEX-CAD.png)
+
+... 
+
+#### Some Force Maths (and a .xlsx file)
+
+ - want (?) from ex. nylon dogbone
+ - for this, w/ motor doing 1.5NM, how much reduction ?
+
+ Have this spreadsheet already, that's great. The D683 dogbone is ~ 8mm wide, and it would be great to test parts at 4 layers of 0.2mm - 0.8mm thick. That's skinny, but here we are: these are all under ~ 500N. OK.
+
+ For that oomph, with a 22T drive pinion, I'll want a 6:1 reduction and a NEMA23 motor (just a short stack) pushing 1.26NM through to a max. 660N linear force. OK, glad to have checked, nice to know about the N23 - I had been thinking of N17s - and will have to watch about getting that 6:1.
+
 ## uSSM #3
 
 ![img](images/ussm3_chassis.jpg)

README.md

-# micro Stress vs Strain Machine
+# The Displacement Exercise (DEX)
 
-## DEX
+DEX is a small materials testing machine that should be capable of running tensile and compressive tests at up to 600N of force. The machine can be manufactured by anyone with access to a laser cutter with at least a 24x12" bed, and nearly any FDM 3D Printer. A bill of materials of purchased parts required to complete the machine is below.
 
-### notes -
+![dex](images/2019-09-27_DEX-CAD.png)
 
-To finish,
- - pinch cross-bearers (haha) +5mm away from pulley corners,
- - mod the squat to walk around cross bearers: agnostic - use holes in series up the cross
- - the feet are an assembly, with legs for delrin
- - the hearth is an order, but not *so* tall
+## Usage
+
+DEX runs a [squidworks](https://gitlab.cba.mit.edu/squidworks/squidworks) controller.
+
+![c1](images/2019-09-06_ussm-controller-01.png)
+![c2](images/2019-09-06_ussm-controller-02.png)
+
+#### Controller TODOs:
+ - serverside squidworks: machine contained system
+ - server config for bootstrap entire system ! (/url-to-program-location)
+ - setup and config-it
+ - assign meaning to charts and graphs
+ - save tests as .json objects (optionally) develop program for reading
+ - save images of tests (genpurp canvas save tool?)
+
+#### Circuit TODO:
+ - draw / fab temp and humidity sensor (looks like Bosch BME280 828-1063-1-ND)
+ - better implementation of load cell amplifier ?
+
+## Building a Displacement Exercise
+
+#### Hardware TODOs:
+ - temp. 3DP for N23-backside mount (w/ old circuits)
+ - bring fixturing here
+ - make queue of prints, tomorrow is JS servers + vfpt, next day is final build (route, etc)
+
+ - to close doc:
+  - BOM, McMaster
+  - this list of bits (incl fixturing), then fusion -> repo
+  - done 4 now, cut long tail
+
+ - print:
+  - 5x new idlers (w/ improved bearing seat distance)
+  - fixturing,
+  - n23 mount
+  - desktop psu (pdbs hello?)
 
 ### BOM
 
-| Part | Spec | Count | Notes | PN | Cost |
+| Part | Spec | Count | Notes | PN / Link | Cost |
 | --- | --- | ---: | --- | ---: | ---: |
-| SHCS | M3x25 | x | Pinning T- and X-es together | x |
-| SHCS | M3x16 | x | Pinning T- to the wall, and pulley endmatter | x |
-| FHCS | M3x10 | x | Pinning blisters to faces, flush up and countersink | x |
+| Delrin (Acetal) Cast Sheet | 24x18", 0.25" Thick | 1 | Advise to buy two in case of mistakes | x | x |
+| PLA 'Tough' | x | ~ 300g | Many 3DP Mechanical Bits | x | x |
+| 625ZZ Bearings | 5x16x5mm Deep Groove Roller Bearings | 24 | x | 625ZZ [VXB](https://www.vxb.com/20-625ZZ-Shielded-5mm-Bore-Diameter-Miniature-p/625zz20.htm) | $40 |
+| Bearing Shims | - | - | - | - | - |
+| Carriage Shoulders | - | (12) | - | - | - |
+| Idler Shoulders | - | 5 | - | - | - |
+| Reduction Shoulder | - | 1 | - | - | - |
+| Feet | - | 3 | - | - | - |
+| NEMA 23 Stepper Motor | - | 1 | - | - | - |
+| GT2 Pinion | 20T | 1 | - | - | - |
+| GT2 Closed Loop Belt | 280T | 1 | - | - | - |
+| GT3 Open Loop Belt | ~ 1M - | 1 | - | - | - |
+| 6806 Bearing | 30x42x7mm Deep Groove Roller Bearings | 2 | x | 6806-2RS [VXB](https://www.vxb.com/6806-2RS-Bearing-30x42x7-Sealed-p/6806rs.htm) | - |
+| M3 Inserts | - | - | - | - | - |
+| M4 Inserts | - | - | - | - | - |
+| M5 Inserts | - | 4 | - | - | - |
+| SHCS | M3x25 | x | Pinning T- and X-es together | x | - | - |
+| SHCS | M3x16 | x | Pinning T- to the wall, and pulley endmatter | x | - | - |
+| SHCS | M3x20 | x | Pinning T- to one another (?) | x | - | - |
+| SHCS | M3x25 | x | Pinning edge-idlers together, | x | - | - |
+| SHCS | M3x45 | 8 | Pinning the 'squat' together | x | - | - |
+| FHCS | M3x10 | x | Pinning blisters to faces, flush up and countersink | x | - | - |
+| FHCS | M3x25 | ? | - | - | - |
+| Dowel | 5x8mm | ? | - | - | - |
+| Feet | - | - | - | - | - |
+| Loadcell(s) | - | - | - | - | - |
+
+### CAD Notes
+
+- fusion / parameters
+
+### Tools for Fabrication  
+
+- laser, 3dprinter
+- soldering iron for inserts
+- arbor press is nice, but not necessary
+-
+
+### Dependencies
+
+This repo is for the machine itself, it implements / uses / depends on the projects below:
+ - pdbs
+ - router
+ - stepper driver
+ - loadcell circuit (find amp, make board?)
 
 ### MFG Notes
 
@@ -30,18 +103,9 @@ To export from Fusion, use Rhino for layout, export cut files as DXF, for the tr
 
 fixturing moves / top to bottom
 
-## Controller Progress
+## Testing Notes
 
-I can run tests now, pulling data back in raw 24-bit signed integers from the load cell amp, and counting single steps.
-
-![c1](images/2019-09-06_ussm-controller-01.png)
-![c2](images/2019-09-06_ussm-controller-02.png)
-
-These from this small sample:
-
-![sp](images/2019-09-06_ussm-controller-test.jpg)
-
-I can save this / output it as a JSON object, and it should be trivial to get this data out to a database somewhere... just need to know how the object should be formatted / how the database should be connected to.
+Use the D683 ASTM Dogbone - normally Type 5
 
 ## Controller Desires
 
@@ -49,12 +113,3 @@ I can save this / output it as a JSON object, and it should be trivial to get th
 - direct upload -> materiom (generic: databases) ... MQTT (and nodered)
 - https://cookbook.nodered.org/mqtt/ (and: https://cookbook.nodered.org/)
 - add to data: humidity, temperature, location, time ...
-
-## Goals for October 18
-
-- machine leaves lab, goes to CiC, runs tests
-- tests: for annealed PLA
-
-## Hardware desires
-
-I want the totem USSM. To spec performance, it should certainly have enough oomph to pull apart 1.75mm filament, maybe 3mm (a good goal). Figure out how many N this is. Also, some reasonable size coupon of 3DP'd coupon.