DrawBot – The Assembly, Part VI

Okay!  It was a good day for drawing robots in the MakerBlock household!  Here’s what we got accomplished:

  • I designed some motor mounts, printed one… and had to redesign it.  Gotta love having a 3D printer!
  • I selected a long shallow pine box to hold the motors and electronics.
  • I tried a variety of sound insulating materials.  Bubble wrap was easily the most effective, but least practical.  I settled on some corrugated cardboard.  I placed some cardboard between the motor and the motor mount and between the motor mount and the wood.
  • I soldered some longer wires to the motor leads.
  • I drilled holes in the wooden box, attached some monofilament line to the spools, put the spools on the motors, mounted the motors, ran the leads to the Arduino, powered it up… and it moved around and stuff!

As this point the next step is to mount it on the wall and actually attempt to draw stuff.  Yay!

Posts in the DrawBot Adventure Series
  1. Wanna make a DrawBot?
  2. DrawBot Resources and Links: Updated 2012/04/19
  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 – Design Considerations
  22. DrawBot – Halp!!! No - seriously, a little help?
  23. DrawBot – The Face Palm
  24. DrawBot – The Delivery, Part V
  25. DrawBot – The Silver Lining of Failure
  26. DrawBot – The Delivery, Part VI
  27. DrawBot – The Assembly, Part V
  28. DrawBot – The Assembly, Part VI
  29. DrawBot – Printed Parts
  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 – Printing, Part II
  36. DrawBot – Why are you crying?
  37. DrawBot – Calibration
  38. DrawBot – Pen Selection
  39. DrawBot – How to Recover from a Stalled Print!
  40. DrawBot – Drawing Success(ish)!!!
  41. DrawBot – Pen Selection, Part II
  42. DrawBot – Onwards and Upwards!
  43. DrawBot – Another Successful(ish) Drawing!, and an Update
  44. Restarting a Stalled DrawBot Drawing
  45. TSP FTW!
  46. Speedier DrawBot Drawings
  47. Two new DrawBot links! And an update!
  48. Excellent DrawBot Slides
  49. Another Drawing Robot!!!

DrawBot – Design Considerations

This post isn’t really so much of an update as it is a way for me to jot down some thoughts about this DrawBot and to keep me occupied. 1 23

  1. Stepper motors mounts
    1. Right now I’m designing some rather mundane stepper motor mounts.  They’re inspired by Ed’s designs, but I’ve written the code myself.  I’ll post the code on Thingiverse once I’ve printed it.  It will output a good looking motor mount, but the design isn’t entirely parametric yet.
  2. Beaded cord, belts, and filament, oh my!
    1. If you check out this Polargraph video, you can see @ 0:22 where Sandy Noble shows a version of his Polargraph operating using two spools winding and unwinding filament.  The versions Sandy was producing for sale used a beaded cord.  The Der Kritzler uses a toothed belt.
    2. There are several downsides to using beaded cord4 or toothed belts.  First, they’re more expensive and slightly more work to obtain than simple mono filament line.  Secondly, they are both bulky.  If you’re using beaded cord or a toothed belt, they’re going to have to dangle off the side of your machine.  This means more moving and swinging parts – which is a whole other problem.
    3. One of the benefits to using a filament line is that you can easily route and redirect the line using pulleys.  This means that you could mount the motors and electronics in close proximity to each other – and then run the filament line through something like an eye bolt or a specially designed5 part.
    4. I don’t know how any of these options would affect the placement and usage of a servo for penlifts.
  3. In a box6
    1. I have this long shallow pine box, at least three feet in length, that may be perfect for this project.  I think I’ll be able to mount the motors, electronics, and just about everything I need entirely inside this box.  If I do, then all I’ll need to do later is mount the box to the wall, plug the USB cable into a computer, plus the power adapter into the wall, and start printing away!  Now, I realize that this implies a totally vertical drawing surface, but I think that is not as much of a problem as it could be.
  4. The Russians used a pencil
    1. Writing on a perfectly vertical surface with a pen can be challenging.  My thought is to create a gondola that has the weight farther back on the gondola – so that it is pushing the pen against the paper.  If the pen were angled down slightly, this might even work a little better.   But, obviously, I’ve never tried any of these variations.  I have to imagine that smarter men than me have considered and discarded these designs.  I have a crappy sketch for this, but I’m really tired and should get some sleep.

To sleep, perchance to dream.  Ay, there’s the rub.

Fear not gentle reader.  If history tells us anything, tomorrow shall bring your RSS feed another deluge of nonsense!

Posts in the DrawBot Adventure Series
  1. Wanna make a DrawBot?
  2. DrawBot Resources and Links: Updated 2012/04/19
  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 – Design Considerations
  22. DrawBot – Halp!!! No - seriously, a little help?
  23. DrawBot – The Face Palm
  24. DrawBot – The Delivery, Part V
  25. DrawBot – The Silver Lining of Failure
  26. DrawBot – The Delivery, Part VI
  27. DrawBot – The Assembly, Part V
  28. DrawBot – The Assembly, Part VI
  29. DrawBot – Printed Parts
  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 – Printing, Part II
  36. DrawBot – Why are you crying?
  37. DrawBot – Calibration
  38. DrawBot – Pen Selection
  39. DrawBot – How to Recover from a Stalled Print!
  40. DrawBot – Drawing Success(ish)!!!
  41. DrawBot – Pen Selection, Part II
  42. DrawBot – Onwards and Upwards!
  43. DrawBot – Another Successful(ish) Drawing!, and an Update
  44. Restarting a Stalled DrawBot Drawing
  45. TSP FTW!
  46. Speedier DrawBot Drawings
  47. Two new DrawBot links! And an update!
  48. Excellent DrawBot Slides
  49. Another Drawing Robot!!!
  1. I don’t feel like working, even though the hour grows late and I will need to get a bunch of things done one way or another. []
  2. And, really making a drawing robot is SO much more productive than what I do on a daily basis. []
  3. I wish I were kidding. []
  4. Either metal or plastic []
  5. Perhaps printed?! []
  6. With a fox! []

My Ultimate Bag

Bag without notes

Bag without notes

In college I used to carry a camera bag where I kept my stuff.  Car keys, notebook, pens, pencils, etc.  This was an old faux-leather camera bag my dad used to use years ago.  I loved that thing.  Unfortunately, it was stolen out of a friend’s car while we were at a concert.

Over the next few years I thought about what I liked about that bag, what I liked about other bags I had seen, and what I would want in an ultimate bag.  I wanted a bag made from tough canvas, hopefully as tough or tougher as denim, and preferably a khaki color.  I ended up going with a relatively thick canvas from a fabric store.

I also wanted a bag that was big enough to accommodate a full size 3″ binder (the type I thought I might use in grad school), small pockets, wide pockets, a large pocket, and a spot for pens and pencils.  It has thick nylon straps around the bag for holding it together and surprisingly expensive plastic buckles.  I sewed the entire thing with khaki colored upholstery thread.

Bag with notes

Bag with notes

If I were to re-make this bag, I would change several things:

  1. I would try to put the pen holder flaps horizontally rather than vertically.  When the bag is mostly empty the vertical pens poke the bag flap upwards.  I think the bag would probably fit better if pen holders were horizontal.  It would also make it easier to reach in and grab a pen when the top flap is buckled down.
  2. I think it would be pretty useful to have one or two small pockets on either side for stowing away a pen on the outside of the bag.
  3. I don’t really ever use both long pockets.  I’d probably nix one.
  4. I’m always using the four small pockets – they’re incredibly useful.  I’d definitely keep those.  However, I think they might be even more useful if they had a velcro flap to keep them closed.  I have a feeling velcro is a lot easier to attach than zippers.  On top of that, zippers can jam – velcro is basically all good.
  5. I would make the large interior pocket a little wider.  It’s about four inches wide – it could be widened to about six or so.
  6. I would absolutely, positively print all of the plastic buckles on my MakerBot.
  7. I would add a plastic lanyard/carabineer/key hook.  Sometimes I want to toss my keys in and don’t want to worry about them bouncing out (not that they ever have).
  8. When I sewed it together I used a setting on the sewing machine that put the thread seams really close together.  With the thickness of the thread and the closeness of the seams, this ended up essentially making perforations in the cloth.  I would still use thick canvas and thick upholstery thread, but I would set the seams to be wider apart.
  9. I’ve often thought that the bag would be a little better if it were lined or reverseable.  If I’m going to line the bag, I might as well make it reverseable anyhow.  If I did this, I would make one side black and one side khaki color.  I’ve used this bag as a pillow more than once – and having two layers would make it more…  fluffy.
  10. I’ve been caught in the rain with this bag on more than one occasion.  While this has never been much of a problem, I think a thicker canvas (perhaps the kind used as a painter’s tarp – the kind that’s partially sealed with plastic and/or rubber) would make an excellent water repellent version.
  11. I’ve taken to carrying zip ties in my laptop backpack.  They’re just always useful.  I think it would be nifty to have a long thin pocket where I could stash a few of these.  They would take up practically no room and also act like ribbing.
  12. Have you ever taken a good look at those luggage tags at the airport?  Whenever I go to an airport, I always snag several of them.  They are springy and very very difficult to break.
  13. I would definitely use a much wider carrying strap.  I think something about three inches thick would be ideal.  Perhaps seat belt strap material?
  14. What about a spot for sticky notes (already there in the small pockets), a cell phone, sunglasses, bluetooth, or camera?  Maybe a spot for my sonic screwdriver…