LEGO Hydraulic Actuator for Technic & Mindstorms

thingiverse

OVERVIEW Bring a new level of mechanical movement to your LEGO creations with these hydraulic actuators. Add manual control and limitless motion to your next project. Watch in awe as kids grasp the fundamental principles of physics and mechanical movement that fuel their passion for STEM. A complete actuator consists of the BODY, where the syringe body is housed, and the PISTON, which fits on the end of the syringe piston. I've provided example photos and videos of a 4-axis arm to demonstrate how these actuators can be used. https://www.youtube.com/watch?v=IVip3lTGjbU Based on Mewalela's excellent "Hydraulic/Pneumatic arm with syringes" design - https://www.thingiverse.com/thing:1328020 LEGO STUFF Enhanced with files sourced from printabrick.org, these LEGO-compatible hydraulic actuators offer a new level of versatility. Use Technic Gear Rack to convert linear actuator motion into rotational movement - https://printabrick.org/bricks/?query=gear%20rack HYDRAULICS I acquired a box of 100 CareTouch 5ml syringes for approximately $12. Most disposable 5ml syringes share the same design, as I was able to directly adopt Mewalela's original design using 5ml syringes sourced in Europe. 5ml syringes - https://www.amazon.com/dp/B074MF3NMF/ Silicone tubing - https://www.amazon.com/gp/product/B01N8Y7UC0/ PRINTING NOTES When printing with a .4mm nozzle, some LEGO parts may not slice correctly. I printed with .4mm and have achieved successful results despite the issue. The missing thin walls do not affect fit or functionality. Supports are required, especially for the piston part. As it's designed for LEGO, you'll need to perform post-print adjustments to ensure a smooth-yet-tight fit. A round file back-and-forth in each hole will quickly prepare these parts for use with the rest of the LEGO system. Test-fit a Technic axle through the hole and if it fits and twists easily, you're ready. If not, repeat filing and try again.