OpenScan EMT - Photogrammetry Turntable

thingiverse

This is an expanded version of the ingenious OpenScan 3D Scanner, crafted using EMT conduit. In this setup, you can scan objects within a space of 18 inches or 455mm in diameter. To achieve this, you'll need to add another stepper motor and make some minor adjustments to the original Arduino code. Scaling up this design is possible by increasing the length of the EMT conduit. The NEMA 17 motors have sufficient torque to move an unweighted rotor, but counterweights are necessary for heavier objects. This project is still a work in progress. Although the frame is complete, there's room for improvement and refinement. A quick-release, modular turntable for holding objects is being developed as well as a system to balance the rotor. This version uses the original OpenScan electronics. To modify the Arduino sketch, simply double the motor steps for the rotor axis. **Key Changes:** * EMT Frame (3/4" ID, 23.5mm OD) * Dual NEMA 17 rotational axes * 608zz bearings at the axis of rotation * 8mm bolts with nylon locknuts for axle * Removal of all press-fit parts * Brass heat-set inserts for all threading **Additional Required Components:** * 2x 3/4" x 10ft EMT Conduit (Link: Home Depot) * 32x M3 x 0.50mm Brass Heat Set Inserts (Link: McMaster-Carr) * 32x M3 x 0.5mm x 10mm Button Head Screw (Link: McMaster-Carr) * 20x M3 x 0.5mm x 10mm Button Head Screw (Link: McMaster-Carr) * 2x M8 x 1.25mm x 65mm Hex Head Bolt (Link: McMaster-Carr) * 2x M8 x 1.25mm Nylon Locknut (Link: McMaster-Carr) * 2x M8 Washer (Link: McMaster-Carr) * 4x 608zz Ball Bearings (Link: Folger Tech) You can replace the M8 bolts, locknuts, and washers with 5/16" hardware. **EMT Lengths:** * 6X: 300mm (Triangle Framing) * 2X: 660mm (Cross Beams) * 2X: 220mm (Rotor Axis: Horizontal) * 2X: 740mm (Rotor Axis: Vertical) **Wiring:** Both rotor motors run on a single stepper driver. To synchronize the movement, you'll need to reverse polarity on one of the stepper pairs. A wiring diagram will be added shortly.