A Hand-Driven Endless-Loop Turntable Drive
One person turning a handcrank can easily move a lightly loaded turntable, and a turntable driven by an endless-loop cable can rotate clockwise or counterclockwise any number of times. The device described here embodies both of those principles in a simple, inexpensive turntable drive.
The welded tube steel drive frame shown in Figure 1 holds a handcrank about 3 feet off the floor, a comfortable working height for most people. With this frame, a stagehand might typically be expected to turn a foot-long handcrank at about 60 to 90 rpm.
To allow the use of a simplified endless loop, all the sheaves in the drive frame are standard cast-iron A-size V-belt sheaves. In ...