I’ve not done any drawing robots in a while and I got the bug again.
I drew Art-O-Matic up in Sketchup (and gear generator) then made the parts from hardboard using a CNC cutter. Added some bolts and presto! Instant art!
Of course I added a pair of stepper motors, controller and an Arduino. I’ve got 12V plugged right into the Arduino. Things get a little warm.
It’s really easy and fun to program, not to mention fun to watch.
David Warren made up a simulator so you can try different combinations of parameters! Art-O-Matic Simulator.
This machine has a magnetic paper holder, pen clamp, pen lift and home switches. It’s easier to operate than the first machine I made below. There are a few more parts to be made for it (start-stop button and mount the wires and controller) .
Sketchup files: draw-o-matic016
Starter Arduino sketch: ArduinoThings
The starter sketch is for the Arduino is assuming the lady ada motor shield. And a power supply (you can’t run this from the Arduino with just USB to your computer. Steppers need too much current.
Here’s the previous version of the machine.
accel stepper problems