DIYbio Orbital Shaker V 1.0

cults3d

UPDATE August 15, 2019: Version 2.5 is now available here: https://www.thingiverse.com/thing:2983846 UPDATE April 10, 2018: We uploaded a new platform with custom slots that allow users to secure straps for containers of various sizes. The file name is NewPlatform.stl. Alternative platforms have been designed and distributed by Thingiverse user Kabong here: https://www.thingiverse.com/thing:2812487 UPDATE March 2, 2018: We discovered a problem with the hex nut on the coupler slipping off. Hot gluing the coupler to the stepper motor shaft solves this issue, or you can remove the rest of the motion control assembly by unscrewing the retainer holding the bearing above the stepper. We completely overhauled the motion control system using M3 bolts (3mm diameter threading, 12mm long threading, 2mm thick head, 5mm diameter head). This design allows for easy assembly and disassembly. We also created a shaft coupler for the stepper motor utilizing an M3 bolt & corresponding hex nuts. We found that friction welding along the edge of the nuts keeps them in place when tightening the bolts. Hot glue is not sufficient to hold them. Close-up photos of the shaft coupling show before and after friction welding the nuts into place. Assembly and wiring diagrams will be posted later. This new design requires only one less 608zz bearing, making it a total of five necessary bearings. Our DIYbio orbital shaker project is underway. A video demo is available here: https://www.youtube.com/watch?v=TnfxUq-xGas A video explaining the assembly process for the motion control is accessible here: https://www.youtube.com/watch?v=FlnDQZjm9aY Using 608ZZ bearings, the motion control system is smooth, reliable, and quiet. Wiring diagram and assembly instructions will be available soon. The files are provided for those who want to attempt building it or start modifying the design. The SketchUp file is also included. Components: 12V stepper motor Pololu DRV8825 stepper driver Arduino Micro Pro Potentiometer Rocker Switch DC Adapter (Female) 608ZZ bearings (x5) 3mm bolts (x3) 3mm nuts (x3) 3mm screws (x3) We used a combination of friction welding and hot glue to assemble the motion system. Hot glue is applied after inserting the bearings with a thin bead placed around the edge, allowing for easy removal later if desired. Nuts are friction welded in place. Arduino sketch: // Simple Stepper Motor Control // // by Achim pieters, www.studiopieters.nl // // Defines pins numbers const int stepPin = 7; const int dirPin = 8; int customDelay,customDelayMapped; // Defines variables void setup() { // Sets the two pins as Outputs pinMode(stepPin,OUTPUT); pinMode(dirPin,OUTPUT); digitalWrite(dirPin,HIGH); // Enables the motor to move in a particular direction } void loop() { customDelayMapped = speedUp(); // Gets custom delay values from the custom speedUp function digitalWrite(stepPin, HIGH); delayMicroseconds(customDelayMapped); digitalWrite(stepPin, LOW); delayMicroseconds(customDelayMapped); } // Function for reading the Potentiometer int speedUp() { int customDelay = analogRead(A0); // Reads the potentiometer int newCustom = map(customDelay, 0, 1023, 300,4000); // Converts the read values of the potentiometer from 0 to 1023 into desired delay values (300 to 4000) return newCustom; }