The Sphere-O-Bot is a simple 2 axis CNC machine that can draw on most spherical surfaces. You can use it to decorate ping pong balls or eggs.This design is based on the 3D printable Sphere-O-Bot. By building your Sphere-O-Bot using a laser cutter, you can achieve a clean look while also reducing the production time of your parts. This design also features an electronics bay for your wires, micro-controller, and motor drivers.
The Sphere-O-Bot described in this tutorial was designed for a workshop in which kids get to build their own motor controllers. For more projects by the Maker Corps interns at the Children's Museum of Houston, visit our site: kidmakers.org
If you like this project, please consider voting for me in the epilog challenge. My internship at the Children's Museum of Houston will end in a couple of weeks and so will my unlimited laser cutter access. Having a laser cutter of my own will allow me to keep developing more instructables for you. Thanks.
Step 1: Materials
You will need:
- 1/4'' plywood
- Access to a laser cutter and 3D printer
- 9 6-32 screws/nuts
- 8 M3 screws
- Micro sized servo motor
- 2 NEMA 17 stepper motors
- Arduino Uno or comparable board
- Polulu A4988 stepper motor drivers
- Marker (Sharpies work well)
- 8mm threaded rod
- Soldering iron
- Small spherical objects (ping pong balls, eggs, etc...)
- A metal spring
Step 2: Laser Cut & 3D Print
Download the design file here and cut it out of the 1/4'' wood using a laser cutter.You could probably also cut these out of plexiglass except for the curved part, since it would not be flexible enough.
The 3D printable files can also be found under the same Thingiverse post. The printable files are actually borrowed from this 3D printable Sphere-O-Bot design.
Disclaimer: It's ok if the renders/pictures in this Instructable don't exactly match the design file on thingiverse. That just means that I've been doing some design changes to help things fit better.