Helical Gear Speed Reducers
Provide high-efficiency speed reduction through 1, 2, 3, or 4 pieces of gears. Power can be transmitted from a high-acceleration pinion to a slower-speed gear. Helical gears generally operate with their shafts parallel to each other. The two most common types will be the concentric (input and result shafts are in collection) and parallel shaft (insight and output shafts are offset). Single-stage helical equipment reducers are usually used for equipment ratios up to about 8:1. Where cheaper speeds and higher ratios are necessary, double, triple, and quadruple equipment reduction stages can be used.
Worm Gear Speed Reducers
A single reduction quickness reducer can achieve up to a 100:1 decrease ratio in a small package. Known as right position right angle worm gearbox drives, these consist of a cylindrical worm with screw threads and a worm. With an individual start worm, the worm gear advances 
only 1 tooth for each 360-degree turn of the worm. So, whatever the worm's size, the gear ratio may be the ‘size of the worm gear to 1′. Higher decrease ratios can be created through the use of double and triple reduction ratios.
Basic Types of Gearboxes
The purpose of a gearbox is to improve or reduce speed. As a result, torque output will be the inverse of the function. If the enclosed drive can be a rate reducer, the torque result will increase; if the drive boosts speed, the torque output will reduce. Gear drive selection elements include: shaft orientation, acceleration ratio, design type, character of load, gear ranking, environment, mounting position, operating temperature range, and lubrication.
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