Description
Specifications
The flexibility of Wood’s engineering, foundry and machine shop facilities allows us to design and manufacture special non-standard sheaves and pulleys to meet a variety of customer requirements. Sheaves and pulleys up to 108 inches O.D., with any face width can be built to customer designs or can be designed by Wood’s experienced engineers to customer specification.
The flexibility of Wood’s engineering, foundry and machine shop facilities allows us to design and manufacture special non-standard sheaves and pulleys to meet a variety of customer requirements. Sheaves and pulleys up to 108 inches O.D., with any face width can be built to customer designs or can be designed by Wood’s experienced engineers to customer specification.
BALANCE
STATIC – All sheaves and pulleys are statically (one plane) balanced.
DYNAMIC – The need for dynamic (two plane) balance is based on both rim speed and face width.
All pulleys and sheaves are given either a static or dynamic balance which is equal to or better than the standards established by The Mechanical Power Trans mission Association.
STATIC – All sheaves and pulleys are statically (one plane) balanced.
DYNAMIC – The need for dynamic (two plane) balance is based on both rim speed and face width.
All pulleys and sheaves are given either a static or dynamic balance which is equal to or better than the standards established by The Mechanical Power Trans mission Association.
BELT LOADS
Single arm pulleys, with standard rims, are designed for 80 lbs. maximum effective belt tension per inch of width. Multiple arm pulleys are designed for and have rims for 120 lbs. maximum effective belt tension per inch of width (extra heavy construction). Both single arm and multiple arm pulleys can be furnished for belts having higher effective tensions than indicated above. See table below.
Single arm pulleys, with standard rims, are designed for 80 lbs. maximum effective belt tension per inch of width. Multiple arm pulleys are designed for and have rims for 120 lbs. maximum effective belt tension per inch of width (extra heavy construction). Both single arm and multiple arm pulleys can be furnished for belts having higher effective tensions than indicated above. See table below.
| Effective Tension | Construction |
| 80 lb. | DB |
| 120 lb. | XH |
| 160 lb. | XXH |
| 200 lb. | XXXH |
| over 200 lb. | SPECIAL |
If pulley is used with Nylon belting imposed belt loads or manufacturer’s belt code, belt width, horsepower, rpm, and installation tension must be furnished to establish construction needed.
BORE
Sheaves and pulleys may be furnished bored-to-size or with mating hubs to accept Sure-Grip bushings at slight extra cost. Sure-Grip bushings are equivalent to a press f it and are preferable to straight machined bores. Straight machined bores, unless otherwise specified, are furnished with tolerances in accordance to MPTA standards. Actual tolerances will be furnished upon application for the specific hub length and bore size.
Sheaves and pulleys may be furnished bored-to-size or with mating hubs to accept Sure-Grip bushings at slight extra cost. Sure-Grip bushings are equivalent to a press f it and are preferable to straight machined bores. Straight machined bores, unless otherwise specified, are furnished with tolerances in accordance to MPTA standards. Actual tolerances will be furnished upon application for the specific hub length and bore size.
CAST IRON
Unless specified otherwise, all made-to-order sheaves and pulleys are constructed of fine grain, high tensile cast iron, and have been carefully engineered to assure maximum performance. Wood’s cast iron sheaves and pulleys are designed for safe operation up to 6500 feet per minute rim speed.
Unless specified otherwise, all made-to-order sheaves and pulleys are constructed of fine grain, high tensile cast iron, and have been carefully engineered to assure maximum performance. Wood’s cast iron sheaves and pulleys are designed for safe operation up to 6500 feet per minute rim speed.
CONSTRUCTION
The number and type of arms, including web centers, is determined by the diameter, face width, rim speed and type of service for which the sheave or pulley is intended. Split pulleys to operate at rim speeds of 4,000 fpm and faster must be made split-thru-the-arm construction. All ductile iron split-type pulleys are furnished only with split-thru-the-arm construction.
The number and type of arms, including web centers, is determined by the diameter, face width, rim speed and type of service for which the sheave or pulley is intended. Split pulleys to operate at rim speeds of 4,000 fpm and faster must be made split-thru-the-arm construction. All ductile iron split-type pulleys are furnished only with split-thru-the-arm construction.
For heavy-duty application and where specifications are such that arm construction cannot be used, web center construction is recommended.
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