DrawBot – Printing, Part II

After actually calibrating my machine, the results are MUCH better.  I still need to adjust the settings a little, but otherwise I’m very very happy with this result.  As you can see, the drawing is flipped.  Once flipped back, I think it is reasonably apparent this is Van Gogh’s Starry Night.  Here are a few things I’m going to try:

  • The pen I was using seemed to stop working in certain regions of the drawing.  I bought a few new pens on my lunch break today.  Both are art marker pens – one blue and one red.  Unfortunately, both are too wide to fit in my current gondola.  For now I’ll use a thin sharpie.
  • There is a slight curvature on the top and bottom of the drawing.  This is probably due to a miscalculation in the mm per rotation.  The downside to using a spool, rather than a sprocket/ball chain or gear/toothed belt, is that as the spool contains more cord, the diameter of the spool actually grows larger.  This means that when there’s a lot of line on the spool each rotation releases more line and when there’s very little line left on the spool, each rotate releases less line.  However, given the diminished space requirements, I don’t think this is going to be such a big deal.
  • I mostly measured the machine width.  Basically what that means is that I did measure it, but then got distracted, then used what I recalled the width to be inches to calculate the width in mm.  Clearly, there is room for increased precision.
  • For weights I’m using a bunch of spent batteries in a ziplock baggie tied with a wire to the gondola.  Too many batteries were causing the line to be too jagged.

”Posts
  1. Wanna make a DrawBot?
  2. DrawBot Resources and Links
  3. DrawBot, the Adventure Begins
  4. DrawBots for the slow learner
  5. DrawBot - Parts Ordered!!!
  6. DrawBot - What would you draw?
  7. DrawBot - The Plan!
  8. DrawBot - The Hacks
  9. DrawBot - The Delivery, Part II
  10. DrawBot – The Software, Part I (and an existential conversation)
  11. DrawBot – The Delivery, Part IV
  12. DrawBot – The Assembly, Part III
  13. DrawBot – Design Considerations
  14. A nifty little WordPress plugin...
  15. i find i want to add more posts in some random series, just so i can use my new plugin
  16. Simple Series WordPress Plugin
  17. Now Simple Series will also add the series list to RSS feeds too!
  18. ZOMG! Simple Series is going viral!
  19. DrawBot – The Assembly, Part VI
  20. DrawBot – Printed Parts
  21. DrawBot – The Operation, Part I
  22. DrawBot – The Assembly, Part VIII
  23. DrawBot – The Breakdown, Part II
  24. DrawBot – Printing!
  25. DrawBot – Printing, Part II
  26. DrawBot – Calibration
  27. DrawBot – Drawing Success(ish)!!!
  28. Plugin Considerations
  29. WordPress Plugin: Easy CC License
  30. All New Polargraph on the way!!!
  31. Sourcing DrawBot Parts
  32. DrawBot - A Preview
  33. Arduino Powered Drawing Robot Poll
  34. Building an Arduino Drawing Robot - On The Cheap
  35. DrawBot - Printed Parts Tour
  36. Unidentified Foam Object
  37. OCD Plugin Stats and the WordPress.org Statistics API
  38. How to add a custom button to the WordPress Visual TinyMCE Editor
  39. A Study of Drawing Robot Pen Holders and Design Considerations
  40. Drawing Robot Pen Holders, Calligraphy Pens, and Thought Experiments
  41. Ideal Qualities in a Drawing Robot Pen Holder
  42. Enough talk! Finally a pen holder!
  43. DrawBot Pen Holder Post Mortem
  44. Drawing Robot Penmanship
  45. PlotterBot at Maker Faire Bay Area 2013!

2 Responses to “DrawBot – Printing, Part II”

  1. […] Calibrating my DrawBot was apparently important to its operation.  Who knew?!  If you’re following along at home, you’ll definitely want to check out Sandy Noble’s instructible on Polargraph calibration.  I’ll put my settings here, but they probably won’t be that helpful to you unless you’re using the same exact equipment and hardware as I am. […]

  2. […] DrawBot – Printing, Part II […]

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