Worm gear shaft

Worm Gear Lubrication
Compounded
Compounded oil has a mineral base that has rust and oxidation inhibitors blended with four to six percent acidless tallow or synthetic fatty acid. They have the ability to adhere to cylinder walls with a temperature limitation of 180o F (82o C). The additives form a protective barrier between the contacting surfaces when conditions go beyond the bulk oil's film strength.
The viscosity of the lubricant depends on the worm’s size, type, speed, and operating conditions. American Gear Manufacturer Association (AGMA) compounded oils classes 7 and 8 are normally used.
Extreme Pressure (EP)
In conditions of high pressure and temperature, an EP oil reacts with a metal surface to form a chemical layer that prevents wear and welding. EP lubricants work well in conditions where there is shock or vibration and are ideal protection of steel. EP gear oils have the same temperature restrictions as compounded oils and are AGMA grades 7 and 8.
Synthetic
Two types of synthetic gear oils have found success with worm gear applications: polyalphaolefin (PAO) and polyalkylene glycol (PAG). PAO and PAG have excellent lubricity qualities and characteristics.
PAO is adaptable to low and high temperature applications and is compatible with mineral oils. Unlike typical synthetics, PAO does not attack seals or paint and has an anti-wear mineral added to improve its boundaries. The only disadvantage of PAO is its cost.
PAG has the same capabilities as PAO with a higher viscosity index than other synthetics. It has anti-wear properties but no EP additives. PAG does not interact well with other fluids and does attack paints and seals.
Conclusion
A worm gear is a staggered shaft gear that creates motion between shafts using threads that are cut into a cylindrical bar to provide speed reduction.
The advantages of worm gears include noise and vibration reduction as well as compactness.
A worm gear system is the most compact type of gearing system; this makes it capable of being placed in very small spaces and still providing high ratio speed reduction.
One of the major benefits of worm gears is their ability to offer gear reduction and torque multiplication in a small footprint.
The assortment of dimensions, shapes, and designs make worm gears adaptable for any number of devices and machines.