Vertical Shaft Worm Drive Gearbox (http://www.servocity.com/html/vertical_shaft_worm_drive_gear.html) only $59.99
Introducing our new Vertical Shaft Worm-Drive Gearbox! This gearbox utilizes a 30:1 ratio worm-drive reduction for applications that require extremely slow and smooth rotational motion. The Vertical Shaft Worm-Drive Gearbox is perfect for turn-tables, time-lapse systems and low-speed applications that require high precision and torque.

The worm-drive design not only minimizes backlash but also eliminates back-driving the gearmotor so a position can be held even when power is not applied. The precision ground 3/8” stainless steel output shaft is supported by dual 3/8” ABEC 5 ball bearings to support a load from any orientation. The ¼” ABS plastic and aluminum structure provides a rigid framework without adding unnecessary weight and is easily mounted to any flat surface by utilizing the base mounting tabs. We offer a wide range of compatible gearmotors to choose from - both our Precision Gearmotors and our Standard 3-12V Gearmotors will work with this gearbox (motor sold separately).

Motor RPM required = 1 / (minutes per rotation desired / 30)
Example: 1 / (10 minutes per rotation / 30) = 3 RPM motor needed to achieve 10 minutes per rotation (at max speed)

For more information visit: Vertical Shaft Worm Drive Gearbox (http://www.servocity.com/html/vertical_shaft_worm_drive_gear.html)

Here is a short clip of the gearbox in action: ServoCity - Worm Drive Gearbox - YouTube