Jul 27

DIY omni directional wheels by KeerBot

Beware,Tech stuff! KeerBot needs to move on the walls to all directions, so I developed a DIY Omni  directional wheel.

Omni directional wheel is a wheel that enables the moving to all sides, it is actually a ball that slides on the housing (as can be seen here in sparkfun). the other thing that can be seen in that link is the price…after I bought some wheels, that got stuck by the spray paint test here, I though of two issues:

  • To make it cheaper
  • To make it simpler (again, KISS principle), and use parts that are available and already in use. * It helped me that my wheel are not carrying any weight, but only support the chassis from being dragged on the painted wall.
KeerBot_omni_wheel2

DIY Omni directional wheels by KeerBot

 

As you can see it is some laser cut plywood (will work better with Perspex), some bolts and ping-pong balls (light, cheap and available).

KeerBot_omni_wheel1

DIY Omni directional wheels by KeerBot

I think that the solution with some minor changes (metal balls/PA balls/ Perspex chassis …)  can fit any need for omni-wheel, Enjoy!

 

 

Jul 20

Spray Paint mechanism for KeerBot

Using spray paint is the next step forward a full outdoors graffiti drawing bot, and I am working on making it versatile and simple for some time now, the mechanism shown is a development of a previous concept, that can probably work on any paint (no matter size or how hard do you need to press)

Spray Painter KeerBotThe idea of the spray paint mechanism is to use only of the shelf parts, laser cut parts and zip ties. the plywood used for the alpha model is much more flexible then needed, next model will use hopefully better material, (any offers ?) (BTW – many thanks to Ohadme for his support)

You can see it works in the video:

Next week the spray guns I mentioned here are arriving, I intend to test and decide which is the best solution. (maybe Dan’s solution ??)

s2

 

 

 

 

 

Jun 29

Can gun – Graffiti Paint Gun

Graffiti spray gun (can gun) will be a great addition to Keerbot, something that connects to a can and operates it.

KeerBot is great, that’s for sure. (I am completely objective), but it still needs to be able to draw on/draw off. I developed an mechanism for spraying (here), and it works great, but it is too clumsy, so I though – Someone probably already made something for that, some Graffiti spray gun, I searched the net, Amazon, AliExpress, MadeInChina and DealExtream and came out with few findings: the term for the search is “Can gun” and here are some products.

Can Gun

Can Gun

This product is meant to be mounted to a spray can and paint by pulling the trigger instead of pressing on the top of the can:

Can gun mounted to a spray can

Can gun mounted to a spray can

My idea is to get one of those (I ordered 2 from Amazon, rgds SElany!) and to hack them to be operated by Servo motor. If I will succeed, price wise it will be much more effective since it costs between 3.5-5.5$ and can be purchased easily, so stay tuned for my blog. much more will come soon!

(by the way – If someone saw/knows of an alternative solution to operate spray paint cans using servo, or any other simple way, or knows a hack for that, please reply in the post,

Jun 19

Robots in Architecture

I currently work on developing a better spray solution for the KeerBot (my current design), so I though “Why not just to ask the Google???” (or DuckDuckGo if you worry for your privacy), quite quick I found an article on “Robots in Architecture” in the site Shapeways.

Kuka robots draws graffiti - Architecture revolution ?

Kuka robots draws graffiti – Architecture revolution ?

Since there are no references to the actual parts used in the article, i was quite disappointed (if anyone find them please reply to the post). and in addition, I am trying to design a solution that will be based on laser cutting technology instead of 3D printing. (quicker, cheaper).

While reading the post, i was redirected to a very interesting site of the The international Association for Robots in Architecture, which is a group that tries to implement robotics in Architecture or (quote):” Robots in Architecture is engaged in applied research, soft- and hardware development, “robot pedagogics” – and in the question: how soon will robots revolutionize architecture?“, and they have quite an active and interesting blog. enjoy!.

Jun 06

PlotterBot? KeerBot? DrawBot?

I was just chillin’ round the web, and then suddenly I found this site, A guy that built a robot that draws on walls and called it PlotterBot. In addition, this nice guy made a list of similar projects around the web. so anyone can join the efforts at the current step and proceed.

MakerBlock Plot

I specially liked the project named “Der Kritzler” by Alex Weber, implemented DrawBot with Arduino and processing Language (Maybe I’ll run it on my unemployed Arduino Duemilanove ??)

So I see that there is very much already done in this project – I hope I can contribute some to it. gnite

Jun 01

Robotic spray – Now i can draw, graffiti robot

remote controlled spray ! finally I made it – graffiti robot

p1Many designs ran through my head, but I wanted to stick to the KISS methodology (Keep Is Simple, Stupid!), so I tried not to include any special manufactured parts, only staff i had at home (which I will find cheap replacements) so now the KeerBot has a on/off spray,

The pity is that I need to find walls now …

p2I will not explain since it is not needed – Just have a look at the sketch and the structure and you’ll figure everything.

Sorry about the movie – can anyone recommend about a good and simple Windows/Linux software that edits videos (.mp4) movie maker doesn’t. (hey – But you can enjoy Mark Ronson !)

If anybody is interested the small profiles are by MicroRax (Bought them for another project, find them expensive but very useful)

 

May 28

KeerBot Will Win

The Victory is in the hands of KeerBot !!! that’s for sure.victory

So I drew the famous V sign… for your amusement

By the way – you can see that in the current video the robot slide on balls instead of on the clumsy tube that used to support the robot – I used ball wheels and an original assembly (All from pre-made parts, I drilled 2 holes. The engineers between my readers will recognize the exploded view (It is easier in Solidworks…)

p0p1

May 25

Generating GCode using Inkscape

Generating G-code (using Inkscape) for the Keerbot means taking a drawing and translating it so the Keerbot will know where to go on the drawing board (X Y terms) and whether to lift or lower the pen servo (Z axis)

Since Dan introduced me to InkScape that can generate the drawings, and then prepared it with CamBam, I searched for a solution that will eliminate the need for Cambam – and I found it !

—————————

Generation of G-Code InkScape and G-Code plugin:

Software:

  1. InkScape: http://inkscape.org/ (might be already with the G-code plugin in the installation)

  2. GCodetools: http://www.cnc-club.ru/forum/viewtopic.php?t=35

 

Steps:

  1. Have a drawing on the InkScapboard.

  2. Select it

  3. Goto: “Extensions-Gcodetools-orientation points”

  4. Select “3 points Mode…” (in “orientation” tab)

  5. Click “Apply” wait… Click “Close”

  6. Goto: “Extensions-Gcodetools-Tools library”

  7. Select “Cylinder” (in “Tools library” tab)

  8. Click “Apply” wait… Click “Close” ( you should get something like that – with big green rectangle)

  9. Goto: “Extensions-Gcodetools-Engraving”

  10. Goto “Options” tab

  11. Fill box “Offset along Z-axis” with the Servo down (drawing ON) position of your KeerBot (Makelangelo)

  12. Goto “Preferences” tab

  13. Fill box “Z-Safe height for G00 move over blank” with the DELTA of Servo up (drawing OFF) position of your KeerBot (Makelangelo)

Example:
Servo down value=50
Servo up value=70
Fill
“Offset along Z-axis”= 50
“Z-Safe height for G00 move over blank”= 20

* Note: the low position will not be 50 but 49.99943 or something similar.

  1. Fill “File” and “Directory” for your convenience.

  2. Goto “Engraving” tab

  3. Click “Apply” wait… ,Click “OK” on popup window , Click “Close”

  4. You should have your G-Code (.ngc) file ready for use !

G00 Z33.000000

G00 X75.502770 Y66.560391

 G01 Z24.633422 F100.0(Penetrate)

G01 X75.796818 Y66.926998 Z25.000000 F400.000000

G01 X75.502770 Y66.560391 Z24.633422

G01 X75.652235 Y66.746743 Z24.819745

G01 X75.035664 Y65.742398 Z24.000002

G01 X79.443693 Y45.906296 Z24.000002

G01 X79.702830 Y45.303216 Z24.122148

G01 X80.634925 Y45.155557 Z25.000000

G01 X79.702830 Y45.303216 Z24.122148

G01 X79.702830 Y45.303216 Z24.122148

G01 X79.473298 Y45.287327 Z24.000002

G01 X79.500307 Y45.298841 Z24.000002

G01 X78.737489 Y44.973298 Z24.000002

G01 X78.312321 Y44.886261 Z24.000002

G01 X78.193251 Y44.864925 Z24.000002

 

Enjoy !

 

KeerBot.com

May 18

IOIO micro controller plotter

Finally IOIO drawing robot!
Drawing robot based on IOIO micro controller that draws amazing artistic sketches – home made plotter, (and similar concept to KeerBot), see here.

IOIO micro controller drawing robot

IOIO micro controller drawing robot

Few months ago I found a very interesting piece of hardware, a micro controller called “IOIO” which was developed by a very talented engineer named Ytai Ben Tzvi. I even had the chance to join a free session he gave on the design and concept of it. Currently I am running my KeerBot project with Arduino, and it works, draws and can keep doing that forever – so why to bother and move the complete project to IOIO board (which instead of simple C code of Arduino works with Android) ??? (and I need to learn programming in Android too for that)

The thing is the great advantage of IOIO concept over Arduino – the lack of computer. after building a robot that is using an IOIO there is no need for computer in the loop !!! (the android device can do the job) which makes it just right for simple and light weight needs. I think now, after Ytai made it cleat that the IOIO can be used as a motor control hardware, Ill have to learn how to do it and implement it on the future of the KeerBot.


In the meanwhile – have a look at Ytai’s project, its really really nice, and if you are in the bay makers faire – this weekend, say hi for me.