Design Example: Ring Turntable¶
This example demonstrates actuating an aluminum ring lazy-susan bearing using a stepper motor with friction roller drive.
200 mm Version¶
The turntable comprises a commercial ring bearing and a support structure laser-cut from 6 mm plywood. The outer diameter of the bearing is 200mm, and the OD of the drive roller is typically 15.47mm, for an approximate ratio of 12.93 motor revolutions per ring rotation. With a 200-step NEMA17 stepper motor, a full rotation is about 2590 counts.
The SolidWorks model files and individual DXF cutting files may be found in the FlatPackExamples/Ring-Turntable folder, or may be downloaded as a single file as Ring-Turntable.zip.
The specific bearing tested is a VXB Kit12879, although the form factor is available from multiple sources.
392 mm Version¶
The larger version is designed for CNC fabrication, milled from 9mm plywood. It is drawn as an alternate configuration in the same SolidWorks files. It features a lazy-Susan bearing with a 392mm outer diameter and uses a NEMA17 stepper motor with planetary reduction gear.
The specific bearing tested is a VXB Kit11281, although the form factor is available from multiple sources.