POLAR DRAWBOT

thingiverse

This is my redesign of mechanical parts for a Wallmount Polar Drawbot. I built mine gathering various information available on the web. The electronics and firmware are from Dan Royer's Makelangelo project, which includes the software and firmware using the V1 version of Adafruit motor shield, but I used a DK Electronics motor shield instead. I conducted several test trials using parts found in multiple projects, but none met my requirements, so I completely redesigned all components. Following tests led to the development of 3 kinds of pulley: one for smooth cords and others for synchronous transmission made with ball chains. 3 types of ball chain are used: Ø 3.2 mm metal chain with a pitch of 4 mm , Ø 4.4 mm plastic ball and cord with a pitch of 6 mm, and Ø 4.4 mm plastic ball and cord with a pitch of 12 mm . They can be used interchangeably, but keep in mind to change pulley diameter in the machine setup to avoid unexpected results. Also, dimensions like stepper motor interaxes or drawing area can be adjusted at your convenience, remember to update them in the setup as well. As for counterweights, I used exhausted "D" type batteries and created multiple kinds of holders to hang them. Inspiration for mechanical parts also came from some photos on Kongorilla's Flickr page (https://www.flickr.com/photos/91789568@N00/). New additions can be viewed here: https://www.flickr.com/photos/133169798@N08/sets/72157652579199386. On August 12, I added a video of the drawbot in action at https://youtu.be/hQ8BQ0GsLiE. I anticipate developing an MK2 version next month.