EP also sells equipment tooth measuring devices called Equipment GAGES! Gear Gages reduce mistakes, save money and time when identifying and ordering gears. These pitch templates are available in nine sets to identify all the standard pitch sizes: Diametral Pitch “DP”, Circular Pitch “CP”, Exterior Involute Splines, Metric Module “MOD”, Stub Tooth, Great Pitches, Coarse Pitches and Unusual Pitches. Refer to the section on GEAR GAGES for catalog quantities when ordering.
MATERIAL recommended for worms is definitely hardened steel and bronze for worm gears. Nevertheless, depending on the application form unhardened steel worms operate adequately and more economically with cast iron worm gears at 50% horsepower ratings. In addition to metal 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 nonmetallic (phenolic).
Protection PROVISION: Worm gearing should not be used because a locking mechanism to carry large weights where reversing actions can cause harm or injury. In applications where potential harm 
is non-existent and self-locking is desired against backward rotation then use of a single thread worm with a low helix angle instantly locks the worm gear drive against backward rotation.
RATIOS of worm equipment sets are dependant on dividing the amount of teeth in the gear by the amount of threads. Thus one threads yield higher ratios than multiple threads. All EP inc. worm gear sets can be found with either still left or right hands threads. EP inc. worm gear sets are offered with Single, Dual, Triple and Qua-druple Threads.
LUBRICATION can be an essential factor to improve effectiveness in worm gearing. Worm gear action generates considerable high temperature, decreasing efficiency. The amount of power transmitted at a given temperature improves as the efficiency of the gearing raises. Proper lubrication enhances performance by reducing friction and high temperature.
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