Commit c83ba601 authored by Jake Read's avatar Jake Read

ongoing

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......@@ -37,6 +37,7 @@ This document will serve as a guide for how to make (almost) a fairly standard 3
- TinyG with a Big Heart (and minimum acceleration!)
#### Machine Communication
- Beaglebone w/ Replicape
- Chilipeppr
- Learning about GCode
......@@ -67,43 +68,37 @@ This is all just loosely blocked out, in this stage I am really trying to get go
Jens Dyvik is on some [wonderful machine building sprials (link!)](https://github.com/fellesverkstedet/fabricatable-machines) and we're going to put them to work this week. In particular, the [chamferrail system](https://github.com/fellesverkstedet/fabricatable-machines/tree/master/chamferrail). Take a look at his documentation to get an overview of the machines!
I'm using his Chamferrail Generator in Rhino and Grasshopper - included in this repo under /cad/axis-generator/ . Now that I have my axis lengths laid out, I'll generate the axis, and go through the process of milling them. I'll do this first on the X Axis and circle back to make any adjustments to the system I see fit!
I'm using his Chamferrail Generator in Rhino and Grasshopper - included in this repo under /cad/axis-generator/ and in [Jen's Repo here](https://github.com/fellesverkstedet/fabricatable-machines/tree/master/humphrito-medium-format-cnc). Now that I have my axis lengths laid out, I'll generate the axis, and go through the process of milling them. I'll do this first on the X Axis and circle back to make any adjustments to the system I see fit!
![generating the x axis](https://gitlab.cba.mit.edu/jakeread/machineweek/raw/master/images/generate-x-axis.jpg)
Use Grasshopper to adjust the parameters - you'll find them all on the left. Things I adjusted were:
- Make sure 'Output Geometry Type' is set to 3D
- 'Make Hole Pattern at Edges' is Yes (I turned this off for the Z axis, where I'll be drilling different holes for mounting end effectors)
- Milling Bit Diameter: 3.175 (1/8")
- Motor Shaft Diameter: 6.35 (for our 1/4" shaft motors)
- Axis Length: 550mm (X Axis, 850mm Y Axis, 260mm Z Axis)
- Axis Width: 80mm
- Material Thickness: 12.5mm (this is important! Measure your stock!)
- Chamfer Distance: 5mm
- Rack Tooth Height: 6.5mm
- Hole Grid Distance: 48mm
- Hole Diameter: 5.25mm (this means we can use M5 Screws to secure the rails)
- Screw Pocket Diameter: 11mm (an M5 washer is 10mm in diameter)
- Edge Screw Pocket Depth: 6.5mm (an M5 Socket Head Cap Screw<sup>9</sup> is 5mm, a washer is 1.1mm thick)
Use Grasshopper to adjust the parameters - you'll find them all on the left. There's a huge swath to get through, use my files in /cad/axis-generator/ to get started as this is set up for what we have on hand in HTMAA.
Now I use the 'bake' command to pull the geometry out of grasshopper and into Rhino.
![generating the x axis](https://gitlab.cba.mit.edu/jakeread/machineweek/raw/master/images/generate-x-axis-bake.jpg)
I took this geometry and used 'copy to clipboard' in rhino (just type the command) and pasted it over into my layout, which I renamed '-detail'.
![generating the x axis](https://gitlab.cba.mit.edu/jakeread/machineweek/raw/master/images/generate-x-axis-copy.jpg)
## Axis Blocks
Now I'm going to start detailing the rest of the machine.
- Connect ur axis
- Bringing layout & detail design together
- It's almost as if I knew about this system while I was doing layout! *~!NONLINEARITYALERT!~*
## Doing the Milling
- Layout and Material Planning in Rhino
- First we go to fusion
- Then we do the milling
Once I'm ready to do some manufacturing, I start by laying the pieces out - grouping them by material. Most things are in HDPE (or ABS - TBD!). The 'rails' are made with Delrin<sup>9</sup> of a similar thickness, and the pinon is made of thicker Delrin, about 3/4". Here's a chance to optimize your layout for the size of sheet stock you have. Keep in mind you'll want clearance between items for cutout tools, etc.
![laying out the x axis](https://gitlab.cba.mit.edu/jakeread/machineweek/raw/master/images/generate-x-axis-layout.jpg)
Now I brought this into Fusion to do some CAM. From Rhino, select the geometry for one material and Export as a *.step* file. Then you can upload this into Fusion.
![generating the x axis](https://gitlab.cba.mit.edu/jakeread/machineweek/raw/master/images/machine-x-axis-setup.jpg)
## Assembly
- Careful on Blocks! Trim and Align
## Plugging in Motors
- Coils are connected
......@@ -132,7 +127,7 @@ I took this geometry and used 'copy to clipboard' in rhino (just type the comman
6. ~ 305x610mm
7. ~ 127mm
8. So I want an H-style layout, because I want to keep the machine small relative it's total work area. One of the biggest drawbacks with an H-machine is that the two sides of the Y-axis are not always set up parallel. The result is what's called 'racking' - i.e. imagine opening a screen door, and the top or bottom exhibits more friction - the 'jam' that this causes happens in CNC Machines as well. A drawing. By cutting both Y-axis rails out of the same 'frame', Jakob gets around this issue - the parallelness of the two rails is a mirror of the parallelness of the machine which cut them. It makes it a bit bulletproof to novice assemblers. He has also done a really good job of keeping the X-axis loads really close to the Y-axis rails (so, a small structural loop).
9. That's a SHCS
9. AKA Acetal, AKA POM
to be linked - dan gelbart
talk about resolution vs. accuracy - repeatability vs absolute accuracty - global vs. local resolutions
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Jake
JARVIS
Friday, October 27, 2017
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Jake
JARVIS
Thursday, October 26, 2017
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Jake
JARVIS
Friday, October 27, 2017
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- [24v 14.6A switching PSU](https://www.omc-stepperonline.com/power-supply/350w-24v-146a-115230v-switching-power-supply-stepper-motor-cnc-router-kits-s-350-24.html)
## Motors
- [Y Motors: 2x NEMA 23 57x57x56 w/ 6.32mm Shaft w/ D](https://www.omc-stepperonline.com/hybrid-stepper-motor/nema-23-bipolar-18deg-116nm-1643ozin-15a-54v-57x57x56mm-4-wires-23hs22-1504s.html)
- [X Motor: 1x NEMA 23 57x57x52 w/ 6.35mm Shaft w/ D](https://www.omc-stepperonline.com/hybrid-stepper-motor/nema-23-bipolar-18deg-09-nm-1275ozin-2a-36v-57x57x52mm-4-wires-23hs20-2004s.html)
- [Z Motor: 1x NEMA 23 57x57x41 w/ 6.35mm Shaft w/ D](https://www.omc-stepperonline.com/hybrid-stepper-motor/nema-23-bipolar-18deg-06nm-85ozin-088a-66v-57x57x41mm-4-wires-23hs16-0884s.html)
- [4x NEMA 23 57x57x56 w/ 6.32mm Shaft w/ D w/ 400 Steps / Rev](https://www.omc-stepperonline.com/hybrid-stepper-motor/nema-23-bipolar-09deg-126nm-1784ozin-28a-25v-57x57x56mm-4-wires-23hm22-2804s.html)
## End Effector Showdown
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- Or do full out ATC
- A Laser Diode (haute)
- A 3D Print Head (also haute)
- Heated Bed
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- Heated Bed
## You need to order
- Motors
- Hardware
- Set Screws
Tools
- 1/16" for M3 Taps ? if they are M4s you can do 1/8"
-> DO THAT
-> NOW: this, circle once again w/ M4 Hardware in the Rails
-> Order 0.9* steppers, send list to others
-> Circle on CAM and bring up for test! does HDPE work? :|
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