Parametric - LittleTurntable - Kleiner Drehtisch

thingiverse

Since I liked my hollow mask (https://www.thingiverse.com/thing:4042661) very much, the desire arose to present it rotating in my bookshelf. So the idea for this little rotating table was born. I designed it with OpenSCAD, the OpenSCAD file is included, and you can set the dimensions yourself or make other changes. With the help of the OpenSCAD file, the individual parts can be rendered and saved as an STL file. To understand the assembly, an exploded view of all parts can also be created. The finished STL files in the download form a turntable with 115mm diameter and 40mm height. The upper turntable is mounted on a ball bearing. 6 steel balls with a diameter of 12mm form the ball circulation. A distance plate keeps the single balls at a distance. The coupling of the rotary plate with the motor axis is magnetic. Therefore, 6 round magnets (4mm diameter, 4mm height) are embedded in the rotary plate. The same number of magnets are embedded in the magnet carrier, which is fixed to the motor axle. Since the magnets absolutely, with correct polarity, want to form a common magnetic field, the contactless coupling occurs. Printed with: - 30% filling density - 0,2mm layer height - 4 vertical contours - 4 horizontal contours - 60mm/s print speed. - Support is not required - With the ball plate, a filament change must be set at a height of 5.0mm to insert the magnets. - At the magnet carrier, a filament change must be set at a height of 4.8mm in order to insert the magnets. You can certainly adjust the drive easier than I did, for example with a small gear motor. But I had the small stepper motor 28BYJ-48 with driver lying around here, so I installed it. Also, the Arduino-Nano3 is from the tinkering box, as well as the 3 TTP223 touch sensors. The enclosed circuit diagram shows how to connect the individual components. The software is available for both Arduino and PlatformIO. If you want to know more about the stepper motor and its control, I recommend to have a look at https://www.kollino.de/arduino/schrittmotor-28byj-48/. The touch sensors are pre-wired and then glued into the case as shown in the picture. I have fixed the connectors with some additional silicone, so that they can't break off at the soldering points. Material list: - 1 * Stepper motor 28BYJ-48 with ULN2003 driver board - 1 * Arduino Nano3 - 3 * TTP223 touch sensors - 6 * steel balls 12mm - 12 * Neodyne round magnets 4x4mm - 1 * 5.5x2.1mm DC power socket All individual parts are easy to obtain on eBay. With a successful print I would be very happy about a Like! Greetings Hardy