Servo Controlled Blast Gate + AC sensor

thingiverse

I printed gears and mount in ABS, and it works flawlessly. I also printed a second set with the gears made from armadillo filament, so time will tell if there's any noticeable difference. Travel covers a 4-inch blast gate, and all three pieces print on a single 200x200 bed. For smaller gates, you can trim off the end of the geared rack. You'll likely want to lubricate the gears/slider mechanism for smooth operation. For servos, you need something with significant torque. I used these: https://www.aliexpress.com/item/1-pieces-MG946R-upgrade-RC-Metal-Gear-Torque-Servo-For-Boat-CAR-13KG-Torque-Metal-Servo/32854187745.html?spm=a2g0s.9042311.0.0.3da24c4d3N29DO I highly recommend them - metal gears and screw holes make them easy to install, just mount the horn that matches the indentation on the wheel and use a longer bolt. It's running powered off an Arduino Uno from a 7-volt power supply. Don't even think about powering these servos from a 5-volt USB. If you want these to automatically open when power is detected on your tool, get the sensors and my case for them here: https://www.thingiverse.com/thing:3368330 See Arduino source code here: https://github.com/Tailslide/BlastGateServo