Linear Actuator (Ball Screw)
Description
Working on a new project requiring (12) ballscrew actuators prompted R&D'ing cost effective solution.This led to many months of developing a 3D printed ball screw with an encoder and hardware cost of 35$/each. Multiple configurations posted for different travel lengths. Travel Configurations: 125-200mm 150-250mm 175-300mm 200-350mm Specifications: Designed around 0.125" (3.175mm) ball bearing Screw Pitch Diameter: 12mm Screw Pitch: 4.5mm Actuation Speed: 23.1mm/s Encoder: 62.66667P/mm Gearmotor: No Load 560RPM, 0.5A (See attached observations) Force: 105N @ 1.0A (assuming 75%e) Force: 367N @ 2.4A (assuming 75%e) I have not tested linear force simply because I don't have appropriate hardware to do so. At 1.5A, I am unable (or unwilling) to stop the actuator by hand in compression. Further testing will happen as I utilize the design. Example of encoder/pid positioning: https://www.youtube.com/watch?v=KTAoLJEhHUw Edit 2019.08.10: Updated bom, replaced bearing with delrin bearing. Cheaper and better wear for plastic on plastic.
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