From 3ea73200cdd08642550375b9b76c09e5ebd24f42 Mon Sep 17 00:00:00 2001 From: Jake Read <jake.read@cba.mit.edu> Date: Wed, 14 Nov 2018 05:51:58 -0500 Subject: [PATCH] test gl --- README.md | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-) diff --git a/README.md b/README.md index 2463622..79b277d 100644 --- a/README.md +++ b/README.md @@ -10,12 +10,11 @@ Machine controllers are *networked collections of input and output devices* that ### How To Play -Machine Design / Robotics can be *basically* broken up into three fields: **Hardware**, **Electronics** (also 'hardware' to some people) and **Control**. +Machine Design / Robotics can be *basically* broken up into three fields: **Hardware** (as in mechanism), **Electronics** (also 'hardware' to some people) and **Control**. -In the CBA Spirit, we figure everything should be modular, recomposable and parametric. +Local to the CBA we have projects for each of these aspects, each having long history in the [MTM Project](http://mtm.cba.mit.edu/). #### [Hardware - RCT Gantries](https://gitlab.cba.mit.edu/jakeread/rctgantries) - As in 'roller coaster tycoon' - we use roller bearings as guide elements. These are parametric linear axis that you can use to fabricate your own linear machines. The repo linked above has hardware documentation, parametric CAD models, and more explanation. @@ -110,7 +109,9 @@ Of course, you can get away without doing very much of this at all - just make s Once you're feeling O-K about your machine design, you should get ready to cut it out. -Again, I do this in Rhino because I like to be able to push things around and nest curves by hand. You can also export faces directly from Fusion by: +Again, I do this in Rhino because I like to be able to push things around and nest curves by hand. + +You can also export faces directly from Fusion by: 1. right clicking on a face 2. creating a sketch on that face 3. rick-clicking on that sketch in the feature menu (left) @@ -122,7 +123,7 @@ First, pick out the 3D Printed Parts and slice them up. Each axis has these 3D P - Belt Holders (both sides) - Belt 'Tenders' (for the motor-adjacent rollers) - 4x -This is a lot of manual model-moving-about and 'nesting'. I recommend drawing out some rectangles of the size you'll be cutting from to make sure you can fit everything into the stock you have available. Your favourite commands will be ``` Orient3Pt ``` , ``` Rotate3D ``` , and ``` Move ```. +Then you're off to lay out all of the flat bits. This is a lot of manual model-moving-about and 'nesting'. I recommend drawing out some rectangles of the size you'll be cutting from to make sure you can fit everything into the stock you have available. Your favourite commands will be ``` Orient3Pt ``` , ``` Rotate3D ``` , and ``` Move ```. Then, the command that you'll want to use is ``` DupFaceBorder ``` - this will take the faces of your parts (with the RCT Gantries, etc, everything should render well into 2D Cuts only [i.e. no pockets anywhere]), and render them as linework. Then you can export this linework (probably as a .dxf) to whatever machine tool you'd like. @@ -136,10 +137,20 @@ For assembly, it's best to follow along the documentation on the [RCT Gantries](  -Filippos has put some documentation together from his experience doing all of this. +Filippos has put some documentation together from his experience doing all of this... is it here yet? + +Belts take some time to get right: + - tensioning the belt can be a pain - pinch it down on the static end (smaller 'block') first, then get it around the motor, and attached (but not tight) on the other end (l-shaped block) + - the motor is mounted on slotted arcs, this is setup so that one mount screw (M5s) can be pinned, and the others rotated, to tension the belt at the motor + - the l-shaped block can also add tension: two of the screws whose axis are parallel to the gantry's motion are there to secure the belt in the block. the other two are there to push against the edge of the gantry, thereby pushing the belt block away from the other side, and adding tension + - one way to get around this is to use *only one belt* instead of the two meshed belts. This will be 1/2 as stiff, but will cross the threshold of 'working' vs. 'not working'. + + - TODO motor stuff / video here ? ## 4) Electronics + - video ? what to say ? + - circuit assembly - wiring -- GitLab