WORM REDUCTION GEAR BOX
	Single reduction gear units are the result of many years of experience. Completely re-designed gear case with liberal ribbing increases heat dissipating area, streamlined sump carrying more oil and larger capacity of fan enhance the thermal rating of the gearbox. All this means that the continuous load carrying capacity is increased without substantial rise in temperature.
	Design Standards
	British as well as Indian standards are used. Worm conforms to casehardening alloy steel, worm wheel conforms to phosphor-bronze PB2-C as per British Standard B.S. 1400, while gear case conforms to C.1 grade FG 220 and for heavy duty FG 250, Indian Standard I.S. 210.
Gear Case
Gear case is of streamlined design, rugged in construction, made of close-grain cast iron. It is completely oil-tight, dust-proof and capable of being installed in the open without a separate cover. The faces and bores are accurately bored and machined on latest precision machines to ensure perfect alignment and interchangeability.
Worm / Worm Wheel
The worm is made of case-hardening alloy steel, carburised, ground and polished and is integral with the shaft. Bearing Journals are accurately ground. Worm wheel is made of centrifugally cast phosphor-bronze rims, shrink fitted and brazed with C.I. centers. Worms are gas carburised and ground Worm wheels are hobbed with high accuracy hobs. Each and every wheel is checked to match with the master worms to ensure complete interchangeability. Right-hand threads are provided, unless otherwise specified.
Bearings
The worms and worm wheels are supported on ball or roller anti-friction bearings of ample margin of safety to allow adequate journal as well as thrust loads. Overhung loads arising out of sprocket or pinion drive are generally permissible because the gear case and bearings are designed for this duty. In cases of heavy overhung loads, an extra roller bearing can be provided.
Wheel Shaft
The wheel shaft is made of high tensile carbon steel, It is of large diameter to carry the torsional as well as bending loads which may be induced by overhung drives.
Lubrication
Lubrication to gears and bearings is by splash of oil from the sump. Thus, no special care is required except for the occasional topping up of the oil to the required level. A large oil filler-cum-breather and inspection cover is provided together with a drain plug and ventilator. Neoprene lip-type oil seals are fitted on input and output shaft. For very low input speed below 50 rpm. And heavy loads in sizes larger than 14" size forced lubrication is required.
Cooling
Air cooling is effected by means of standard polypropylene or metal fans which direct a continuous flow of air over the ribbed surface of the gear unit. The fan is designed to operate in both directions of rotation, and is so arranged in conjunction with the ribbing on the gear unit as to allow maximum heat dissipation.
HoldBack
Sprag type holdback can be fitted on all sizes of gears to prevent reverse rotation. In cases where holdback is required, the direction of rotation of the shaft should be mentioned.
Overloads
All the components of the reduction gears are so designed that they can withstand. 100 per cent overload for 15 seconds 50 per cent overload for one minute 40 per cent overload for 30 minutes and 25 per cent overload for two hours.