The procedure is:
- using your CNC router, create a spherical stencil that fits on to a ball.
- spray paint each ball
- CNC router, or better yet a 3-d printer.
- a hunk of 3/4" wood
- spray paint
- some balls
In the next step, you'll see how I created the 3-d model.
Step 1: Create Your 3D Model
I used 3/4" wood to create the stencil. Simply make a 3/4" sheet, and scoop sphere out of it. Tennis balls are 6.7cm in diameter. Leave a mm or two of thickness at the bottom so you don't cut through.
Grab the attached inventor file if you don't want to make your own.
I added all design and g-code files to the attached .zip file. Just download and carve :-)
Step 2: Create the G-Code
Create the g-code from the 3-d model. I divided carving the sphere into a separate step from carving the smiley face. That way I can make a few spherical templates, then carve different patterns.
Step 3: Carve!
I carved the sphere, then the smiley.
Step 4: Cut Out the Smiley Face!
Using the attached smiley.ngc, you can carve the smiley face :-)
Step 5: Paint
Now, it's a simple matter of holding the tenns ball onto the stencil while spray painting :-)
Wash rince repeat!