DrawBot – Calibration

Polargraph Calibration by Sandy Noble

Polargraph Calibration by Sandy Noble

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.

  • Setup->MM per Rev = 50
    • Based on the actual spool center diameter, this should be 47.  But, with some line wound onto the spool, it should be more like 54.  So, of course, I chose something that was neither.
  • Setup->Steps Per Rev = 400
  • Setup->Machine Width = 844
    • Although the “Machine Width” is defined by Sandy as “The distance between the two closest points on the sprockets,” I used a different figure.1  Since my machine uses spools, rather than sprockets, and the spools are unwound on the far side of the spool, I measured from the far edge of the spool’s core the the other far edge of the other spool’s core.  I figure this is probably the best measurement of the width of the line available to the machine.
  • Setup->Machine Height = 848
    • This is a relatively arbitrary specification given that my spools have about four times as much filament than I could use in my current configuration.  I intended this to be 844, but must have typed it in wrong.  :)
  • Setup->Page Width = 216
    • Rounded up from 215.9, which is 8.5 inches converted to millimeters.
  • Setup->Page Height = 279
    • Rounded from 279.4, which is 11 inches converted to millimeters.
  • Setup->Pen Tip Size = 0.12
    • With my 2’x4’x0.5″ board covered in butcher paper, I’ve marked out on the paper the locations of the various important lines for my machine.

”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 - 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?
  13. DrawBot - The Delivery, Part II
  14. DrawBot – The Delivery, Part III
  15. DrawBot – The Assembly, Part I
  16. DrawBot – The Software, Part I (and an existential conversation)
  17. DrawBot – The Delivery, Part IV
  18. DrawBot – The Assembly, Part II
  19. DrawBot – The Assembly, Part III
  20. DrawBot – The Assembly, Part IV
  21. DrawBot – The Delivery, Part V
  22. i find i want to add more posts in some random series, just so i can use my new plugin
  23. Simple Series WordPress Plugin
  24. Now Simple Series will also add the series list to RSS feeds too!
  25. ZOMG! Simple Series is going viral!
  26. Simple Series with SEO! after just one day
  27. DrawBot – The Delivery, Part VI
  28. Anti-Virals
  29. Simple Series - Half-Life; Market Research
  30. DrawBot – The Assembly, Part VII
  31. DrawBot – The Operation, Part I
  32. DrawBot – The Assembly, Part VIII
  33. DrawBot – The Breakdown, Part II
  34. DrawBot – Printing!
  35. DrawBot – Calibration
  36. DrawBot – Pen Selection
  37. DrawBot – Onwards and Upwards!
  38. WordPress Plugin: Easy CC License
  39. WordPress plugin - OCD Plugin Stats
  40. TSP FTW!
  41. Two new DrawBot links! And an update!
  42. Another Drawing Robot!!!
  43. DrawBot Practice Tip: A Watched Pot
  44. DrawBot Aesthetic Re-Design Ideas
  45. Every Body Needs a Skull
  46. I think I know what I want to draw next...
  47. This project is not going to overengineer itself
  48. Overengineered Spools
  49. Overengineered Stepper Motor Mounts, Filament Guides
  50. Overengineered Bolt Endcaps, Case Holder
  51. DrawBot - A Preview
  52. Building an Arduino Drawing Robot - On The Cheap
  53. DrawBot - Printed Parts Tour
  54. Unidentified Foam Object
  55. Arduino Powered Drawing Robot - Take 2 (Or 3)
  56. DrawBot, now ACTUALLY wall mounted!
  57. Simple Series WordPress Plugin Update
  58. OCD Plugin Stats and the WordPress.org Statistics API
  59. How to add a custom button to the WordPress Visual TinyMCE Editor
  60. A Study of Drawing Robot Pen Holders and Design Considerations
  61. Drawing Robot Pen Holders, Calligraphy Pens, and Thought Experiments
  62. Ideal Qualities in a Drawing Robot Pen Holder
  63. PlotterBot.com - a new site dedicated to drawing robots

  1. Heaven forbid I do something normal, right? []

2 Responses to “DrawBot – Calibration”

  1. terance says:

    I just built a drbo. Any suggestions on how to calibrate it? I am trying to use the directions for the polargraph, but it seems wonky. In the drbo, the sprokets are below the drawing area and I can’t seem to find anything online.

  2. MakerBlock says:

    @terance: Have you reached out to Stuart Childs? He designed the DRBO robot to use Sandy Noble’s polargraph software. I would think that if you used Stuart’s design files and built yours accordingly, you could just use his setup?

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