Worm Gears are right angle drives providing large velocity ratios on comparatively short center distances from 1/4” to 11”. When correctly installed and lubricated they Nylon Gear Rack function as the quietist and smoothest running type of gearing. Because of the high ratios feasible with worm gearing, optimum speed reduction can be accomplished in less space than a great many other types of gearing.
EFFICIENCY of worm gear drives depends to a big degree on the helix angle of the worm. Multiple thread worms and gears with higher helix position prove 25% to 50% better than one thread worms. The mesh or engagement of worms with worm gears creates a sliding action causing considerable friction and better lack of efficiency beyond other styles of gearing. The utilization of hardened and floor worm swith bronze worm gears boosts efficiency.
LUBRICATION can be an essential factor to boost efficiency in worm gearing. Worm equipment action generates considerable warmth, decreasing efficiency. The quantity of power transmitted at a given temperature increases as the performance of the gearing improves. Proper lubrication enhances efficiency by reducing friction and high temperature.
RATIOS of worm equipment sets are determined by dividing the number of teeth in the apparatus by the number of threads. Thus one threads yield higher ratios than multiple threads.
Protection PROVISION: Worm gearing should not be used because a locking mechanism to hold large weights where reversing actions could cause harm or damage. In applications where potential damage is non-existent and self-locking is preferred against backward rotation after that use of an individual thread worm with a low helix angle automatically locks the worm equipment drive against backward rotation.
MATERIAL recommended for worms is definitely hardened steel and bronze for worm gears. However, depending on the application unhardened metal worms operate adequately and more economically with cast iron worm gears at 50% horsepower ratings. Furthermore to steel and hardenedsteel, worms can be found in stainless, aluminum, bronze and nylon; worm gears are available in steel, hardened metal, stainless, light weight aluminum, nylon and non-metallic (phenolic).
Gear racks are utilized to convert rotating movement into linear motion. A equipment rack has straight the teeth cut into one surface of 
a square or round section of rod and operates with a pinion, which is usually a small cylindrical gear meshing with the gear rack. Generally, equipment rack and pinion are collectively known as “rack and pinion”. There are many methods to use gears.
There are applications where in fact the gear rack is stationary, while the pinion traverses and others where the pinion rotates on a fixed axis as the gear rack moves. The previous is used widely in conveying systems while the latter can be utilized in extrusion systems and lifting/lowering applications.