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 Delivery, Part II
  11. DrawBot – The Assembly, Part III
  12. DrawBot – The Assembly, Part IV
  13. i find i want to add more posts in some random series, just so i can use my new plugin
  14. This is a test of the Simple Series post system... This is only a test
  15. Now Simple Series will also add the series list to RSS feeds too!
  16. DrawBot – Printed Parts
  17. DrawBot – The Assembly, Part VII
  18. DrawBot – Why are you crying?
  19. DrawBot – Calibration
  20. DrawBot – Pen Selection
  21. DrawBot – How to Recover from a Stalled Print!
  22. DrawBot – Drawing Success(ish)!!!
  23. DrawBot – Pen Selection, Part II
  24. DrawBot – Onwards and Upwards!
  25. DrawBot – Another Successful(ish) Drawing!, and an Update
  26. Plugin Considerations
  27. WordPress Plugin: Easy CC License
  28. TSP FTW!
  29. Two new DrawBot links! And an update!
  30. Excellent DrawBot Slides
  31. Another Drawing Robot!!!
  32. DrawBot Practice Tip: A Watched Pot
  33. Why do DrawBots draw on walls?
  34. Maze Code + Polargraph?
  35. I think I know what I want to draw next...
  36. Overengineered Spools
  37. Overengineered Stepper Motor Mounts, Filament Guides
  38. Sourcing DrawBot Parts
  39. Arduino Powered Drawing Robot Poll
  40. Building an Arduino Drawing Robot - On The Cheap
  41. How to add a custom button to the WordPress Visual TinyMCE Editor
  42. A Study of Drawing Robot Pen Holders and Design Considerations
  43. To Maker Faire!!!
  44. Drawing Robot Penmanship

  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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