EP also sells equipment tooth measuring products called GEAR GAGES! Gear Gages reduce mistakes, save money and time when identifying and ordering gears. These pitch templates are available in nine sets 
to recognize all the regular pitch sizes: Diametral Pitch “DP”, Circular Pitch “CP”, Exterior Involute Splines, Metric Module “MOD”, Stub Tooth, Good Pitches, Coarse Pitches and Uncommon Pitches. Refer to the section on GEAR GAGES for catalog quantities when ordering.
MATERIAL recommended for worms can be 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 steel and hardenedsteel, worms can be found in stainless, aluminum, bronze and nylon; worm gears are available in steel, hardened steel, stainless, aluminium, nylon and non-metallic (phenolic).
Protection PROVISION: Worm gearing should not be used as a locking mechanism to hold weighty weights where reversing action can cause harm or injury. In applications where potential damage is non-existent and self-locking is preferred against backward rotation after that use of a single thread worm with a minimal helix angle automatically locks the worm equipment drive against backward rotation.
RATIOS of worm gear sets are dependant on dividing the number of teeth in the apparatus by the number of threads. Thus solitary threads yield higher ratios than multiple threads. All EP inc. worm equipment sets are available with either remaining or right hands threads. EP inc. worm gear sets can be found with Single, Dual, Triple and Qua-druple Threads.
LUBRICATION can be an essential factor to improve performance in worm gearing. Worm gear action generates considerable heat, decreasing efficiency. The quantity of power transmitted at a given temperature raises as the performance of the gearing increases. Proper lubrication enhances performance by reducing friction and heat.
If this write-up didn’t meet your curiosity concerning Worm wheel gear, check these extra ones out.