As another expansion to my GOPRO TIMELAPSE SHIELD (http://www.instructables.com/id/ARDUINO-GOPRO-TIMELAPSE-SHIELD/) , i built a cable-dolly.
The axles are made of skateboard bearings and M8 bolts, like in the GOPRO SLIDER (http://www.instructables.com/id/ARDUINO-GOPRO-TIMELAPSE-SLIDER/)
I used spare parts i had lying around, so i didnt have enough of the small distance pipes from the skateboard wheels.
What this means is that i had to use other stuff to get the right distance, which in my case, are more bearings and shims, but i will change that at a later point.
Step 1: THE AXLES
The axle itself is an M8 bolt, from the outside of the axle it goes:
--A skateboard bearing
--A small shim for the right distance between the first bearing and another
--2x distance pipes from inside a skateboard wheel.
--Another bearing, a very cheap one that already has the distance element built into it, so it looks like a distance pipe, but its part of the bearing
--A smaller shim
--A big shim
That whole axle is then screwed to the middle part of the dolly.
Step 2: MOUNTING THE SHIELD
The shield is mounted to the dolly, with a metal part i had from an old beamer mounting.
I put some felt pieces on it to not shorten anything on the shield.
Step 3: DRIVING
I used the same endless servo that i used in the last project, and tried to mount it as close as possible to tha main axis.
For now i used a clamp i had from a third hand (soldering help).