Reply to "cr0sh": Yes I am planning to release more details. You can subscribe to my Youtube profile, and you will get a notice, when more stuff is available.
Reply to "CSingleton": I also work at a company where we use delta robots (commercial models) - this is what has triggered my interest for this type of robot. I have not added the rotary 4th axis to this prototype, because the control of this axis is trivial. It is mathematically simple, whereas the physical aspects of it is more complex, when you are on a low budget, like I am.
Reply to "Parcanman": You're right. There is one arduino for each axis. I have tried to use 1 arduino for all three axes, and it can be done. However, I like to run the servo control loops at the highest possible frequency, because it improves the regulation (less oscillations, overshoot, etc.). With only 1 Arduino, the processor is pushed to the limit, and consequently, future extensions to the control loop are limited.
Reply to "designer2k2": Once I have calculated the correct dynamical parameters, it will run much faster than this. I will show some videos later.
"incu": ... It also blows me away.
Didn't think the result would be that good when I started.