Commit 6e550516 authored by Ruben Castro's avatar Ruben Castro
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# The Clear Air Turbulence
![catone](catone.jpg)
The [CAT](https://en.wikipedia.org/wiki/List_of_spacecraft_in_the_Culture_series) is a bed-dropping machine implementing a swappable tool system.
This is meant (largely) to serve as an easily-replicated, well known machine that can be put to use on a range of common fab processes: pcb milling (or light milling: i.e. molds), 3d printing (swappable extruder heads would be cool), pen plotting (etc), and knife-cutting.
To do this, I'm going to develop in parts. The top (CA), a low-profile plotter using (1) of [these pulley axis](https://gitlab.cba.mit.edu/jakeread/rctgantries/tree/master/gantries/n17_linearPulley) on the spanning x-direction, with a modified set of (2) of them on the y-axis (split). The bed (T) a gear-reduced [similar but more-gusto-having axis](https://gitlab.cba.mit.edu/jakeread/rctgantries/tree/master/gantries/n17_heavyPinion).
I'd like to take this chance to develop some chassis practice. I have been working through [making decent structures from plastics](https://gitlab.cba.mit.edu/jakeread/rctgantries/tree/master/beams) and I'd love to develop a tool (probably rhino/gh) to 'tab-out' arbitrary planes. I think if I simplify these worlds so that (1) only one 'type' of intersection exists and one type of printed part. The part should be small, leaving most of the 'work' to be done with shear through the insert. As a revolve, I can make this world thickness-agnostic as well. Feels like a worthwhile, easy-ish rhino/gh project, that I hope would serve me in the future.
## Dev Log
Ok well here's the idea of a machine, lots to do.
At this point, notes are for the haystack instance.
To scale, I'm going to fit the width to a 24" sheet, so the hoop gets 18" of travel (roughly) (update: 15.8").
OK ... motors to the back: out of harm's way when loading clay etc, do by flipping motor - pulley-tensioning axis -> also nice for tensioning and mod tracking pulleys.
Watch that bonus ~ 60mm on the back y-bar ...
I had some trouble annealing something that feels like a solid structural loop. It still feels a bit kludged, but I think the best way to rev is to make one. So.
Next task is to try this rhino/gh tab-geometry-proliferating device.
Still needs:
- beam geometry
- headgear (front set: pin the U-mode)
# The Clear Air Turbulence
# Clear Air Turbulence (CAT)
![catone](catone.jpg)
The [CAT](https://en.wikipedia.org/wiki/List_of_spacecraft_in_the_Culture_series) is a bed-dropping machine implementing a swappable tool system.
The [CAT](https://en.wikipedia.org/wiki/List_of_spacecraft_in_the_Culture_series) is meant (largely) to serve as an easily-replicated, well known machine that can be put to use on a range of common fab processes: pcb milling (or light milling: i.e. molds), 3d printing (swappable extruder heads would be cool), pen plotting (etc), and knife-cutting...
This is meant (largely) to serve as an easily-replicated, well known machine that can be put to use on a range of common fab processes: pcb milling (or light milling: i.e. molds), 3d printing (swappable extruder heads would be cool), pen plotting (etc), and knife-cutting.
A few design goals are held in mind for this machine that could make or break the possibility of this machine:
This machine is meant to be made with plastic using mainly a laser cutter and set of 3D printers. The first version of this was made using acrylic. Moving forward, Delrin will be used to prevent cracking, however, both are useable depending on your specific machine needs.
To do this, I'm going to develop in parts. The top (CA), a low-profile plotter using (1) of [these pulley axis](https://gitlab.cba.mit.edu/jakeread/rctgantries/tree/master/gantries/n17_linearPulley) on the spanning x-direction, with a modified set of (2) of them on the y-axis (split). The bed (T) a gear-reduced [similar but more-gusto-having axis](https://gitlab.cba.mit.edu/jakeread/rctgantries/tree/master/gantries/n17_heavyPinion).
Total lasercut runtime: ~ 5 hrs
Total 3D print runtime: ~50 hrs
I'd like to take this chance to develop some chassis practice. I have been working through [making decent structures from plastics](https://gitlab.cba.mit.edu/jakeread/rctgantries/tree/master/beams) and I'd love to develop a tool (probably rhino/gh) to 'tab-out' arbitrary planes. I think if I simplify these worlds so that (1) only one 'type' of intersection exists and one type of printed part. The part should be small, leaving most of the 'work' to be done with shear through the insert. As a revolve, I can make this world thickness-agnostic as well. Feels like a worthwhile, easy-ish rhino/gh project, that I hope would serve me in the future.
The machine CAD is also parametric, meaning you can tune the width, length, depth, structural strength, height, etc.
## Dev Log
Ok well here's the idea of a machine, lots to do.
## Material Selection
A few different plastics can be used. We can talk here about the Pros and Cons of each one to help you better select a material to use.
At this point, notes are for the haystack instance.
Since we are laser cutting, Acrylic and Delrin are the two main options. If you have access to something like a router, perhaps different plastics can be considered.
To scale, I'm going to fit the width to a 24" sheet, so the hoop gets 18" of travel (roughly) (update: 15.8").
Delrin ultimately would be the best option if you can. The thing about Delrin is that it's a bit tedious to cut 1/4" on a not-so-hot laser. If you have the ability to do 1/4" Delrin, that's definitely the best option as Acrylic can crack quite a bit. Another thing that we must take into account is hardness. Acrylic is harder than Delrin, and for the bearing rails, there is worry that use will cause heavy wear on Delrin. This will be something to keep an eye on towards the future.
OK ... motors to the back: out of harm's way when loading clay etc, do by flipping motor - pulley-tensioning axis -> also nice for tensioning and mod tracking pulleys.
## CAT 0020
This is prototype version 2 of the CAT. The first attempt ended up being not quite so rigid.
Watch that bonus ~ 60mm on the back y-bar ...
![firstrun](media/CAT0020firstrun.mp4)
I had some trouble annealing something that feels like a solid structural loop. It still feels a bit kludged, but I think the best way to rev is to make one. So.
### Joining plastic sheets
In order to join the plastic laser cut sheets, 3d printed joinery is made. There is a few types of joinery. The bed uses HexTrompo joints. Named that because they look like the toy commonly used in Mexico: [Trompo](https://en.wikipedia.org/wiki/Trompo). These little dudes help tension the two bed sheets together with the webbing pieces sandwiched in the middle. There is a male one which lies on the top and a female one with a heat insert on the bottom sheet. An M4x55 bolt runs between them and keeps it all nice and taught. This way, all the loads that go on to the bed first come through a 3d printed part softening the load on the acrylic hopefully preventing some of the cracking if you use acrylic. A whole bed's worth should take about 10 printer hours to make.
Next task is to try this rhino/gh tab-geometry-proliferating device.
Still needs:
- beam geometry
- headgear (front set: pin the U-mode)
### Making the parts
From the fusion model, you can create dxfs of all the required pieces along with STLS for all the 3d prints.
### Assembly
First up, you want to assemble the bed part.
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