Update September 2013: What started as a hobby has turned into something pretty serious. We are readying the launch of an open-source cinematic motion-control rig. If you wanna stay up on the futue of cinematography "like" us at facebook.com/openmoco

Click here to see my latest modification: Jib arm
farm7.static.flickr.com/6079/6091226379_019d2b5207_b.jpg

farm7.static.flickr.com/6186/6091773198_b831eee47d_b.jpg

Trolley:
-2 Sets of Roller Blades (16 wheels/32 ball bearings) from Goodwill
flickr.com/photos/bradjustinen/5882721666/in/photostream
-Aluminum angle
-All-thread
-Nuts/Washers
-Thread Locker

Motorized Pan Tilt:
-Meade motorized telescope arm
-90 degree angle bracket for connecting the camera to the telescope arm
-1/4 20 bolt/screw or regular tripod head
amazon.com/Meade-Coronado-Telescope-Mount-Milapse/dp/B0056ZYD3O

Track:
Something long, straight, and rigid. Obviously aluminum is the best choice, both for it's rigidity and portability. Because the trolley is built with all-thread the width can be adjusted to fit almost any track - so you can use aluminum extension ladder or a 2x6 from Home Depot. I am currently using to two rails from an aluminum server rack. I cut some strips of perforated steel plate to attach the two rails with exact spacing.
fullcompass.com/product/343632.html?gclid=CPWQ55vqrKoCFQFubAod7hPuXQ

Motorized Trolley Movement:
-Traxxas Transmitter/Receiver
-Parallax (Fubatu) Continuous Rotation Server
-Parallax SumoBot Wheel & Tire
-6v AA Battery Holder (Holds Four AA's)
I usually move the dolly by hand but for time lapse or slow movement I use a Parallax continuous rotation servo with a wheel that is attached to the trolley. The servo is control via a Traxxas radio and receiver. The Traxxas radio also has speed/direction potentiometers on it - so you dont have to hold the radio during movement if you dont want to.
traxxas.com/products/parts/transmitters/2228tq24ghz2ch
parallax.com/Store/Accessories/MotorServos/tabid/163/CategoryID/57/List/0/SortField/0/Level/a/ProductID/102/Default.aspx
parallax.com/Store/Robots/AllRobots/tabid/755/CategoryID/57/List/0/SortField/0/Level/a/ProductID/412/Default.aspx
ledlight.com/battery_holder_aa_1x4_with_wires.aspx

This project contains some remixed elements from the these projects:
DIY video & timelaps electrical dolly
vimeo.com/9179128
DIY Inexpensive Camera Slider
vimeo.com/15891760

music credits, in order:
Ror-Shak - Interlude #1
youtube.com/watch?v=pj59p73URFw
Pretty Lights - Forever Lost
youtube.com/watch?v=a_XZNN1rsOM
BT - Flaming June (Chicane Remix)'
youtube.com/watch?v=HjtYVFXM270
Bear Hands - Crime Pays
youtube.com/watch?v=97W_mgA8Ytg&ob=av3e

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