This is the Polar Coaster Drawing Machine. It was designed as a demonstration of polar kinematics. This version draws things on round drink coasters. Blank drink coasters are available from many suppliers including Amazon.com. The bed has little "fingers" that securely hold the coasters without any need for clamping.
Check out the video.
You can use most 3 axis CAM programs to generate the GCode. You then run the GCode though a pre-processor that converts it to polar coordinates. This allows it to use basic CNC firmware. The firmware thinks it is running a standard 3 axis Cartesian machine.
You can use just any CNC controller that supports at least 2 axes and a servo. I use my pen/laser controller and the base has mounts for it. Other people have used 3D printer controllers like RAMPS.
I have written a few blog post regarding this machine.
I printed everything with standard settings on a TAZ 6. The only part that requires support is the radial axis carriage. You can buy the GT2 pulleys or print them. If you are adventurous, you can print the polar belt. I recommend PolyFlex from PolyMaker because it is the least stretchy flex filament I have foound.
In addition to the 3D printed parts you will need the following parts.
|NEMA14 Stepper Motor||2|
|GT2 Belt 186 Tooth||1|
|GT2 Belt Open xxLg||cut|
|Bearing 5mm Bore||2|
|Bearing 3mm Bore||3|
|Bearing 6mm Linear LM6LUU||2|
|Bearing 3mm Linear LM3UU||4|
|6mm Shaft xxLg||2|
|3mm Shaft xxLg||2|