DIY motorized belt driven IGUS slider
After finishing my DIY belt-driven backpack-sized IGUS slider I discovered that no matter how carefully I turned the crank or pushed the carriage I could not get completely smooth motion across the full length of the slider. Since I had a few servo components lying around from a previously unfinished project I decided to replace the handwheel with a continuous rotation servo.
The servo and the controller are from ServoCity.com. The fancy controller box is not necessary to the project - it is a way for me to add my own potentiometer to the ServoCity controller so as to have a larger knob.
The power comes from an iGo USB battery pack. It provides 5.5V of power to a servo that can handle between 4 and 6V.
The servo mount was the only part that needed to be fabricated. I had it laser cat by Pololu.com. The mount concept is very simple: since the servo is lightweight and is already mated to the shaft the only thing the mount has to do is keep the servo from rotating. It is made from several pieces of 1/4" acrylic and is designed to hold the bearing block on 3 sides. A PDF of the mount is attached below. The top plate needs to be tapped for #4-40 screws. The other holes are sized for #10-24 screws. I used metal standoffs to create proper spacing between the top plate and the parts holding the bearing block.