Worm Shafts

1 Module/ 16 D.P. to 10 Module/3 D.P.
Outer Diameter from 10 mm/0.40" to 300 mm/12"
Face Widths upto 500 mm/19"
In Single or multi starts
Center Distance from 25mm/1" to 500mm/20"
In Mild Steel, Alloy Steel, Hardened and Tempered Steels, or as specified
standard and custom made as per Specifications, Drawing or Sample
Worm shafts like for Worm Gear Boxes (most of the makes) of C.D. 50, 60, 75, 85, 100 mm, Ratio 30:1 or 40:1 are usually available Ex-Stock (Subject to conformation).
For Automobiles and Industrial uses
Worm Shaft and Worm Wheel Pairs suitable for power transmission in right angle
Reverse engineering of Gear sets and Gear Boxes

Worm Gears

1 Module/25 D.P. to 20 Module/1.5 D.P.
Outer Diameter from 20 mm/0.75" to 2100mm/80"
Face Widths upto 800 mm/31"
In Single or multi starts
Center Distance from 25mm/1" to 500mm/20"
In Cast Iron, Bronze (PB2S), or as specified
standard and custom made as per Specifications, Drawing or Sample
Worm Gears available on very tight delivery schedules, some Worm Wheel & Worm shafts Pairs like for Worm Gear Boxes (most of the makes) of C.D. 50, 60, 75, 85, 100 mm, Ratio 30:1 or 40:1 are usually available Ready-Stock. Other ratios are also available within One day of placing Order or on short notice (subject to conformation).
Gear Box Overhauling and Rebuilding Services

Worm Shaft Teeth Profile Grinding

Teeth Cutting of Worm Gear on Gear Hobbing machine

Key way slotting of Worm Gear on Slotter

Worm gear and worm shaft pair speed reducers are right angle speed reducers used in applications usually involving low horsepower. Worm gear set maintain high gear ratios, low or nearly nil gear play or backlash, high shock tolerance, and compact design.

A worm gear is used when a large speed reduction ratio is required between crossed axis shafts which do not intersect. A worm drive consists of a large diameter worm wheel with a worm screw meshing with teeth on the periphery of the worm wheel. The worm is similar to a screw and the worm wheel is similar to a section of a nut. As the worm is rotated the worm wheel is caused to rotate due to the screw like action of the worm. The size of the worm gear set is generally based on the centre distance between the worm and the worm wheel.

Worm gears provide a normal single reduction range of 5:1 to 100-1 and can go easily upto 127:1 or more under rare circumstances. The pitch line velocity is ideally up to 30 m/s. The efficiency of a worm gear ranges from 98% for the lowest ratios to 20% for the highest ratios. As the frictional heat generation is generally high the worm box is designed disperse heat to the surroundings and lubrication is and essential requirement. Worm gears are quiet in operation. Worm gears at the higher ratios are inherently self locking - the worm can drive the gear but the gear cannot drive the worm. A worm gear can provide a 50:1 speed reduction but not a 1:50 speed increase. In practice a worm should not be used a braking device for safety linked systems e.g hoists.