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Turntable Drawing Machine

Sketches

As previously mentioned, I’m working on a new drawing machine, and it’s based on a turntable. I’ve included some of the sketches here, as I continue to explore a few ideas.

Sketches

There’s a number of aesthetic choices to make in the design of this thing, including the material. Right now I’m focusing on wood for the majority of the build, but may also include some acrylic (which may allow for some LED lighting) and metal. I’d consider Alupanel, as that stuff is pretty nice, but it’s also a bit pricey, especially since I’d need a piece that is 19″ x 15″.

Sketches

There’s also the mechanical build to deal with. I’ve got a good idea of how that will work, and I should be prototyping the spinning platter mechanism this week. I have semi-working Arduino code already, but I’m still contemplating direct drive versus a belt system. (I have all the parts, just need to start experimenting.)

Turntable

I stopped by Bliffert Lumber last week to grab some 1/4″ Baltic Birch plywood, and I cut the top panel and turntable. These may just serve as test pieces and not final pieces, but it’s something to start working with. I used a 90 watt laser cutter as it’s quick and easy. I do have a 1/4″ end mill coming in this week, so I can cut 3/4″ wood on the big CNC router if needed. It’ll all depend on material and time. (This needs to be completed in about a month.)

Hopefully I can start working on the arm mechanism by next week, as there’s a few tricky bits involved there. I’m not sure if I will use limit switches, a servo, or make the pen placement a manual process. Hopefully a prototype will come together soon and answer some of those questions.

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A Brief History of Drawing Machines

Machine Drawing

I stumbled upon this project titled Machine Drawing Drawing Machines by Pablo Garcia a while ago, and then I found this great video of a talk he did at MIT about the history of drawing machines.

Pablo Garcia

Technology and art have always come together in some way…

It is a long video, and it was an hour into it before I realized Pablo was the guy behind the NeoLucida Kickstarter. I’m not as much a fan of drawing aids as I am machines, but there’s a ton of great info in the video.

There’s also a DrawingMachines twitter account worth checking out, as well as Pablo’s account, and his web site at pablogarcia.org

The video revealed a lot about machines and drawing that I’ll be thinking about for a while, especially in relation to my own work and views on these things. Good stuff!

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A New Drawing Machine

I’ve been designing a new drawing machine that is inspired by turntables. You know, those old-fashioned devices that old people used to listen to music…

I’ve made some progress on the electronics so far, and the controls will most likely consist of two potentiometers to control two stepper motors, and there may or may not be a servo involved for the pen lifting. (And yes, two steppers and a servo are sort of the common elements of many drawing machines.)

While many of my drawing machines are cobbled together with bits of wood and hot glue, I’m going to attempt to actually design this one. I’ve been looking at a number of turntables for design ideas, and wow, some of those things are just beautiful! Some examples below…

Turntable

Turntable

Turntable

Turntable

Wood Turntable

Belt Drive

I’ve started to collect other images/links over on a Pinterest board. Some are just interesting machines or mechanisms, but a lot of them are turntables or drawing machine related.

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Polargraph Experiment #1

Motor Mounts

I needed a few motor mounts for a project and since I was at Milwaukee Makerspace it seemed quicker/faster to just laser cut a few since I had files on my laptop. (I could have 3D printed them as well.)

Polargraph

I assembled a quick and dirty polargraph, and while I attempted to use an Adafruit Motor Shield I had on hand, it did not work. The steppers were not moving, just humming and stuttering.

I then grabbed the CNC Shield I’ve been testing and put that in place. The steppers worked fine with a test sketch, but the firmware I wanted to load (Dan’s Makelangelo code) expects either an Adafruit Motor Shield or a RUMBA board. I thought about trying to rewrite things to work with the Pololu motor drivers, but it was also after 11pm.

(I later realized that I should have looked at the RUMBA firmware, as that supposedly works with RAMPS. And yes, while I do have a spare RAMPS board, it’s across town at my studio. I decided to punt and see what I could do with what was in my workshop.)

Shapes

I figured I’d throw Grbl on it and see what happened. I used Grbl Controller to connect to the board and loaded some G-code to run. I knew it would not work (as expected) but I tried anyway.

Drawing

Grbl supports machines that use Cartesian coordinates, but not those that use polar coordinates, like a polargraph. Still, I was surprised at what I got. It basically worked, except for flipping the image and running it diagonally up to the left.

Grbl Controller

I then took my original vector file and flipped it, and skewed it up and to the left, to match (somewhat) how it was drawn by the machine.

Shapes skewed

It actually sort of worked! I think it was after midnight by now so I gave up on it. My lack of math skills prevent me from converting between coordinate systems, but I think there’s a few things to explore here, and if I get time (uhhh) it may be something I play with a bit in the future. Also, if anyone wants to add polar coordinate support to Grbl that would be lovely. :)

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Prusa i3 Progress

RepRap Prusa i3

We’re making good progress on our RepRap Prusa i3 in our Machines that Make class at UWM.

We cut the Lexan frames on the large CNC router after we wrote the G-code in RhinoCam. There was an engraving, and then one inside cut, one outside cut, and some center drill spots we marked before drilling the holes on the drill press and then tapping them for 3mm screws.

We also cut all the threaded and smooth rods on the horizontal bandsaw and then cleaned them all up on the belt sander. I learned a few new tricks for cutting threaded rod as well.

I’m a bit tempted to rebuild my Prusa i2 as a (laser-cut) Prusa i3, or maybe just build a second printer. I’d like to have a 1.75mm machine at some point instead of just 3mm so I can experiment with more filaments.

I’ve also been working on a few new machine design ideas, one will be a drawing machine, and another is a platform for building CNC machines that trade in precision for low-cost. More on those in future posts.