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 in the DrawBot Adventure Series
  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 - The Breakdown
  7. DrawBot - Parts Shipped!!!
  8. DrawBot - What would you draw?
  9. DrawBot - The Plan!
  10. DrawBot - The Hacks
  11. DrawBot - Giant Unicorn?
  12. DrawBot - The Delivery, Part II
  13. DrawBot – The Assembly, Part I
  14. DrawBot – The Software, Part I (and an existential conversation)
  15. DrawBot – The Delivery, Part IV
  16. DrawBot – The Assembly, Part II
  17. DrawBot – The Assembly, Part III
  18. DrawBot – The Assembly, Part IV
  19. DrawBot – Design Considerations
  20. DrawBot – Halp!!! No - seriously, a little help?
  21. DrawBot – The Face Palm
  22. DrawBot – The Delivery, Part V
  23. DrawBot – The Silver Lining of Failure
  24. DrawBot – The Delivery, Part VI
  25. DrawBot – The Assembly, Part V
  26. DrawBot – The Assembly, Part VI
  27. DrawBot – Printed Parts
  28. DrawBot – The Assembly, Part VII
  29. DrawBot – The Operation, Part I
  30. DrawBot – The Assembly, Part VIII
  31. DrawBot – Printing!
  32. DrawBot – Printing, Part II
  33. DrawBot – Why are you crying?
  34. DrawBot – Calibration
  35. DrawBot – Pen Selection
  36. DrawBot – How to Recover from a Stalled Print!
  37. DrawBot – Drawing Success(ish)!!!
  38. DrawBot – Pen Selection, Part II
  39. Restarting a Stalled DrawBot Drawing
  40. Speedier DrawBot Drawings
  41. Two new DrawBot links! And an update!
  42. Excellent DrawBot Slides
  43. Another Drawing Robot!!!
  44. DrawBot Practice Tip: A Watched Pot
  45. The biggest inkjet printer ever
  46. Why do DrawBots draw on walls?
  47. Maze Code + Polargraph?
  48. All New Polargraph on the way!!!
  49. Ideas for improving my DrawBot
  50. DrawBot Aesthetic Re-Design Ideas
  51. The Eagle Has Landed
  52. I think I know what I want to draw next...
  53. Overengineered Spools
  54. Overengineered Stepper Motor Mounts, Filament Guides
  55. Overengineered Bolt Endcaps, Case Holder
  56. Sourcing DrawBot Parts
  57. DrawBot - A Tour!
  58. DrawBot - A Preview
  59. Arduino Powered Drawing Robot Poll
  60. Building an Arduino Drawing Robot - On The Cheap
  61. DrawBot - Printed Parts Tour
  62. Unidentified Foam Object
  63. Arduino Powered Drawing Robot - Take 2 (Or 3)
  64. DrawBot, now ACTUALLY wall mounted!
  65. A Study of Drawing Robot Pen Holders and Design Considerations
  66. Drawing Robot Pen Holders, Calligraphy Pens, and Thought Experiments
  67. Ideal Qualities in a Drawing Robot Pen Holder
  68. Enough talk! Finally a pen holder!
  69. DrawBot Pen Holder Post Mortem
  70. To Maker Faire!!!
  71. Skipping! How could I forget the skipping?!
  72. Drawing Robot Penmanship
  73. PlotterBot at Maker Faire Bay Area 2013!
  74. PlotterBot.com - a new site dedicated to drawing robots

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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