PWM Servo Powder Dispenser

thingiverse

You will need: 1) 100mm x 38.2mm (1.5") OD x 35mm ID Acrylic Tubing 1) 40mm x 38.2mm (1.5") OD x 35mm ID Acrylic Tubing 1) 58mm x 7mm Brass Tubing 1) 32mm x 7mm Brass Tubing 1) 3 1/2" Dacro Deck Screw -- grind off the threads for ~10mm from the tip and superglue it into the sheetrock anchor 1) Sheetrock Self Drilling Anchor -- this is your Auger 2) 6mm x 1mm panhead screws (to mount spindle assembly to servo arm) 4) 16mm servo screws Drive the servo with an Arduino, or your favorite controller. Assemble the two small cylinder halves around the deck screw head. One end of the cylinder pieces is chamfered to receive it. Hold with pliers. Drive the screw end of that assemblage into the short retaining ring, using a narrowly opened vice or what have you as a stop block. Next drive the tubing coupler on to the head end of the deck screw assemblage. You wind up with the spindle coupling you see inside the large acrylic tube. Press fit the long brass tube into spindle assembly head. Press fit the short brass tube into the cone. Drill out a bit of the plastic (1/4" bit) from the inside of the cone to receive the tip of your sheetrock anchor. There are different sizes, so drill for what you have. You may also change the length of the acrylic tubing, or the brass tubing coupler to get things to fit to your liking. Mount the servo to the servo block. Mount the servo arm to the servo. Mount the spindel assembly to the servo arm. Slip the servo block assembly on to the acrylic tube. Slip the cone assembly on to the screw end of the acrylic tube. ------------ Slide the lid off of the hopper to fill the tube with any granulated powder of your choosing. Use a servo controller to dispense powder as needed. Hack a servo to spin 360* and then calibrate running the servo x number of seconds to dispense y amount of your powder.