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Polargraph - Parts and Instructions

by jolars Dec 3, 2014
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I think You can use metal chain to conduct power to the servo. Teoretically It's possible :)

Hey, this project looks great. I have a couple of questions though.

  1. Can I use svg's to create drawings of this kind: http://colouringbook.org/Holidays/Xmas/LEMMLING/lemmling_cartoon_owl_black_white_line_art_scalable_vector_graphics_svg_scalable_vector_graphics_svg_clip_art_christmas_xmas_stuffed_animal_coloring_book_colouring-999px.png
  2. Is it possible to adjust the dimensions of the gondola to hold a whiteboard marker

I have to make this for a job, and the boss wants these questions answered before I actually do make

Thanks so much, and Good work

Yes, it can do vector plots. There is a "Load Vector" button that loads a vector drawing from an SVG file.

I tested it and it works well.

You could feed it .jpg's to get something similar to the drawing you posted - but it does not take vector graphics, it is not a plotter. To do exactly what you are asking, you want a plotter.

I am sure you can adjust the dimensions of the gondola to hold a whiteboard marker - or you could find white board markers that fit the gondola.

Hey, I really liked your chain pulley design. However, when I had purchased 100' of bead chain, I purchased 3.2 mm which is not suited for your pulley. I had trouble finding 3.5 mm bead chain

Interesting - I purchased my chain at the local Hardware store (Lowe's) and designed the pulley based on the actual chain in my hand

Thanks. I wanted to ask what kind of 12v, 1.5a power supply are you using? I have a PSU from a computer that I hacked, and I am unsure if I should use it as the 12v packs 18amps. What is your recommendation?

I am using a computer power supply, seems to provide nice clean power

Do you have the model? I have been having issues the past two days with my power distribution that I might just go off what someone else has done .

Thx in advance!

Comments deleted.

hello i am in the process of building this project, i had a questions regarding the surface i can use. Can i use a small board ? i dont have the space to have a peace of plywood in my room and I don't wont to draw on such a large sheet of paper, i just wont to use printing paper.

I have only done this with the board specified, but in the software setup you enter start/stop locations and the size of the drawing surface - it should work (within reason)

Two models seem to have inside walls and in Cura the slicer gets confused.

  1. gondola.stl
    The support walls as shown in the screenshot have an inside wall, so Cura seperates those walls.

  2. Polargraph_CounterWeight.stl
    Not quite sure what these two pairs of spheres are all about at the top of the model. They too seem to have overlapping edges and Cura once again gets confused. What is the reason for these spheres? Will a simple shaft not suffice?


Thanks for your work!

I use Slic3r, this design didn't give me any trouble when slicing.

The balls are for the type of chain used for the polargraph, it fits into those locations.

I've noticed that my pulleys don't fit on the nema 17 shafts (5mm) without a bit of dremeling. Before dremel - the diameter hole was about 4.7-4.75mm (not the flat part).

Did you have to do any scaling on the pulleys to get the shafts to fit? Or did you dremel too?

Mine fit cleanly without any extra tooling. Each printer is different, so long as they worked after the tooling you should be good.

I have a printrbot simple metal with a heated bed. Your profile says you have a printrbot simple metal too. Do you have a heated bed?

I might try to not heat the bed - and see if it changes things. It would be interesting to compare your cura settings if you'd like to share them.

I do have a printrbot simple metal with a heated bed - I am sure I used the heated bed for this part.

I use Slic3r, perhaps that is the difference. When you print calibration cubes, do they print the correct size - ie does a 10cm cube print at 10cm cubed? my xy dimensions are within .05 my z is off a bit, only one decimal .5ish - so things like this print very well on my printrbot.

The part is quite snug on mine, but does fit without tooling.

Let me know if my slic3r settings would be of any help.

I'll test my cubes today or tomorrow - but yes it would be great if you posted your slicer ini - just to see if it improves my print out of the box.