Commit 3564184f authored by Jake Read's avatar Jake Read

add mucho data from materiom, some notes

parent 824d0ca7
......@@ -10,14 +10,16 @@ With \#2 feeling somewhat unloved ('both overdesigned and underdesigned'), I'm b
While aluminum is my go-to for machine design, and is ostensibly possible to mill on a shopbot by a motivated user (see [jens](https://github.com/fellesverkstedet/fabricatable-machines/wiki/Fabricatable-axis)), there is some hesitation to use it.
| Material | Young's Modulus (GPA) | Cost for 6mm x 24x24" | Machinability |
| Material | Young's Modulus (GPA) | Specific Young's | Cost for 6mm x 24x24" | Machinability |
| --- | ---: | ---: | --- |
| ABS | 2 | 52 | Not Dimensionally Stable, but OK to Machine |
| Nylon 6 | 3 | 130 | Painful |
| HDPE | 1 | 23 | Easy |
| 6061 ALU | 69 | 87 | Breezy with WJ, Painful on Shopbot |
| FR1/CE (Canvas / Phenolic) | 6 | 81 | TBD, probably WJ Pain and Ease on SB |
| FR4/G10 (Fiberglass) | 22 | 98 | Painful on a WJ, Slightly Easier on a Shopbot |
| ABS | 2 | ? | 52 | Not Dimensionally Stable, but OK to Machine |
| Nylon 6 | 3 | 2.5 | 130 | Painful |
| HDPE | 1 | ? | 23 | Easy |
| Acetal (Delrin) | 2.8 | ? | 89 | Breezy, also lasers, and non-cracking |
| Cast Acrylic | 3.3 | 2.8 | 46 | Breezy, esp. w/ Lasers |
| 6061 ALU | 69 | 22 | 87 | Breezy with WJ, Painful on Shopbot |
| FR1/CE (Canvas / Phenolic) | 6 | ? | 81 | TBD, probably WJ Pain and Ease on SB |
| FR4/G10 (Fiberglass) | 22 | ? | 98 | Painful on a WJ, Slightly Easier on a Shopbot |
[data](http://www.acculam.com/data-chart.html)
......@@ -25,6 +27,8 @@ That said, ALU lands pretty well 1 order of magnitude above Canvas Phenolic ('FR
!TODO: beam equations for the above, to size req' depth
!TODO: shear forces for the same,
!TODO: cost not-mcmaster, and acrylic, some composite like hydrostone w/ fiber
- ... composite vendors at fabclass website
### Transmission Design
......@@ -110,6 +114,12 @@ To ballpark, I'd like to see 100mm diameter plates having a total travel from 0m
Sam's note: the ballscrews should be 'pulling' in all cases. Against their fixed, driven side. This is a good note, thank you sam.
### Phoning Home
Samples are ~ < 1mm thick, and data from Materiom shows loads all falling well under 100N. IMO, the machine should be spec'd somewhere positive of 500N pulling force, so that we can reasonably pull apart big plastic samples. That said, 500N < 5kN.
Down here, once-reduced belt-and-pinion rack drives feel good. Since I'm looking for a medium high-force actuator to solve a 3D Printing-Bed problem elsewhere, I'm going to try to combine work here again, and develop a 3d-printing + laser-cutter friendly high force linear system. Conservative spec will allow me to even do this with N17 motors,
---
## Step Two: Force Measurement
......@@ -169,7 +179,7 @@ And out of plane, with 250N applied, about 20uM displacement. So 1/10th the load
# uSSM \#1: 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).
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).
![machine](images/ussm-at-mm.jpg)
......
Tabla de resultados 1
;Longitud del indicador axial (origen de deformación)
;(mm)
1;100.00000
2;100.00000
3;100.00000
4;100.00000
5;100.00000
Tabla de resultados 1
;Longitud del indicador axial (origen de deformación)
;(mm)
1;100.00000
2;100.00000
3;100.00000
4;100.00000
5;100.00000
6;100.00000
7;100.00000
Tabla de resultados 1
;Longitud del indicador axial (origen de deformación)
;(mm)
1;100.00000
2;100.00000
3;100.00000
4;100.00000
5;100.00000
6;100.00000
7;100.00000
Tabla de resultados 1
;Longitud del indicador axial (origen de deformación)
;(mm)
1;100.00000
2;100.00000
3;100.00000
4;100.00000
5;100.00000
6;100.00000
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Tabla de resultados 1
;Longitud del indicador axial (origen de deformación)
;(mm)
1;100.00000
2;100.00000
3;100.00000
4;100.00000
5;100.00000
6;100.00000
Tabla de resultados 1
;Longitud del indicador axial (origen de deformación)
;(mm)
1;100.00000
2;100.00000
3;100.00000
4;100.00000
5;100.00000
6;100.00000
7;100.00000
Tabla de resultados 1
;Longitud del indicador axial (origen de deformación)
;(mm)
1;100.00000
2;100.00000
3;100.00000
4;100.00000
5;100.00000
6;100.00000
Tabla de resultados 1
;Longitud del indicador axial (origen de deformación)
;(mm)
1;100.00000
2;100.00000
3;100.00000
4;100.00000
5;100.00000
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