DIY Drawing Robot Project Unassembled Arduino Uno + CNC Shield

DIY Drawing Robot Project Draw Bot is similar to the commercially available AxiDraw. It is powered by an Arduino Uno controller, uses a CNC Shield, and GRBL firmware. The approximate cost to build the Draw Bot is $150.

Here’s what is new for Draw Bot Version 1.1 DIY Drawing Robot Project
I’ve improved many parts, but all new parts are compatible with all of the old robot parts. Here’s what has changed:

How to assemble:

1. There’s a new Pen Holder which is sturdier but still maintains the ability to hold a pen at an angle. The new pen holder works with the current robot.
2. Stronger version of the pen sliding mechanism. It is compatible with the original pen holder and robot. The extra strength will hold the pen more firmly and allow more accurate movement of the pen.
3. User Gasp pointed out that Arduino Vin can’t handle more than 1A. There is a new slide showing how to connect power from the Arduino barrel connector to the CNC Shield.
4. There’s a new bracket designed to attach the Arduino enclosure to the right hand of the robot. See the new front page photo! The bracket uses existing holes so no other parts need to be modified.
5. I have designed a cable management system that uses a 500 mm x 9mm large wire tie to support the Z axis servo wiring.
6. I just found out that the DrawBot works with some of the AxiDraw software. I will document what works and how to use it. This is really cool and will make the DrawBot even more useful.
   All new parts will have a newer suffix to the old part name (V4 becomes V5, etc..). You may use the new design or you are welcome to print the older versions.Upload GRBL to your Arduino Uno using these instructions
   https://github.com/grbl/grbl/wiki/Compiling-Grbl
   (Ignore references to GRBL V1.1)
   You must copy the config.h which I supply here to the directory where GRBL resides and then do the upload. The new config.h will be used for the compile of the GRBL code. Failure to copy this file will result in your robot plotting at a 45 degree angle. Seems like I said that doesn’t it? Well I get messages weekly from people wondering why this design doesn’t work and why it prints at a 45 degree angle. I’m getting old

   Firmware Used

   Firmware customization of GRBL comes from Robottini
   https://github.com/robottini/grbl-servo

   Inkscape to draw/import/convert and generate Gcode files (from extensions menu)
   https://inkscape.org/

   Inkscape extension for creating Gcode
   https://jtechphotonics.com/?page_id=2012

   Sourcerabbit Gcode sender
   https://www.sourcerabbit.com/GCode-Sender/

Package Include  hardware:

1. All 3D printed Parts Shown in Images
2. 2x Nema 17 Stepper Motors
3. 2x Linear bearing rod M8 x 450mm, X Axis
4. 2x Linear bearing rod M8 x 350mm, Y axis
5. 2x Linear rod M3 x 75mm, Z Axis
6. 1x M8 x 480mm threaded rod
7. 8x LM8UU linear bearings or printed bearings
8. 1x sg90 Servo
9. 2x GT2 Pulley 16 teeth
10. 5x Bearing 624zz
11. 1x 2000mm GT2 belt
12. misc. M3 and M4 screws and nuts
13. M8 nuts
14. Arduino Uno
15. CNC Shield for UNO
16. 2 A4988 Stepper Drivers plus jumpers
17. 12V 5A Adapter

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