My first attempt in motorizing my India made IGUS slider. I was very lucky to find all the components I need. I got the PWM controller off Ebay and the high torque motor locally. Found a rubberized pulley that is used in factory automation in a recycling parts store and it proved to be great for providing enough traction to grip the braided nylon cord. Its still not perfect though, it stutters on a particular section and I think I know how to solve the problem, I suspect there is not enough traction on a single cord, I'm going to experiment to see if 2 nylon cords will provide enough traction. I'll be uploading the video taken by my 550D after I uploaded this one.
Time lapse video of Winter Solstice Lunar Eclipse on December 21, 2010 from 1:10 AM EST (6:10 GMT) to 5:03 AM EST (10:03 GMT) from Gainesville Florida. The music is Claude Debussy's Nocturnes: Sirènes.
A stabilized version of this video has been posted at: vimeo.com/18239117