About Sherman + Reilly Distribution Sheaves
The sheaves described below are those that fit Sherman + Reilly XS-100B (and XS-200B) blocks. Each is interchangeable with any other in an XS-100B frame. All have identical 7 in. x 3 in. outside dimensions and have profiles to match their usage. All are made from the best materials for their purpose and are manufactured to render high performance, durability, and long life. All turn on low-friction, sealed, lubricated-for-life ball bearings, which render 98% efficiency and assure long-term reliability and smooth, minimum-load stringing.
Polished Groove Sheave – Standard (Original):
The 7” x 3” aluminum alloy sheave is a permanent mold casting that is heat treated for strength and extended life for multiple applications of conductor stringing and cable placement. The sheave has anti-friction sealed ball bearings lubricated for life under normal conditions. This sheave will provide a constant 98% effi ciency during stringing to reduce the amount of force during pulling and tensioning operations. This reduces the strain on the conductor.
Effective grounding of stringing blocks is extremely important in areas where induced, static, or impulse voltages might be encountered during construction. Establishment of typical values of the conductivity of the entire block including the neoprene lining were needed. Having a value expressing the conductivity of neoprene per cubic centimeter as it is usually measured is meaningless in this application. This sheave is also interchangeable with all XS-100 frames.
Urethane Lined Sheave: This sheave has the same profile as the polished groove and neoprene but has a cast-in-place polymer urethane. S+R Urethane is a polymer that has a special kind of thermo-setting characteristic. It combines in one material the resiliency of rubber and the hardness of structural plastics and possesses the additional important properties such as high load bearing capacities, resistance to impact, abrasion, compression set, ozone, oil, and many chemicals. Sherman + Reilly premium grade urethane elastomer should be very much distinguished from the weaker urethanes, which are better suited for filling voids, insulation and other uses not requiring great structural strength. In addition to its unique accommodation of properties, it also differs from conventional elastomers in several ways. It is a liquid polymer, which is compounded chemically (to initiate curing), and from which sheave linings are fabricated by casting with a 90 – 92 “A” scale durometer hardness.
Sherman + Reilly urethane possess the important property of elasticity, which makes it ideal for use as a sheave lining. When the wire rope pulling line or conductor is in the sheave under load, the material will fl ow in accordance with the force exerted on it. This makes an ideal application for conductor, static wire or even fi ber optic cables. This sheave is also interchangeable with the XS-100 Frame. This same material is currently used on all S+R bullwheel tensioners.
Ductile Iron Sheave:
The toughest and most durable of all the sheaves is the 60-45-10 ductile iron-galvanized sheave. This sheave has the same profi le as all the other 7” x 3” sizes and is totally interchangeable in any XS-100 Frame. This sheave is ideal for stringing steel static, new or reconductoring. The block weight will increase approximately 7 lb. when using the ductile iron sheave. This sheave is not recommended for aluminum conductor.
Nylatron Sheave: Nylatron is one of the oldest and most widely used engineered mechanical plastics. Its combination of toughness, dimensional stability, wear resistance, and versatility make it a natural choice for conductor stringing sheaves. Nylatron has performed well in replacing many metals and offers a long life. This sheave has the same profile as all the other 7” x 3” sheaves and it is also totally interchangeable with all S+R XS-100 frames. This material can be extruded or machined from solid stock and has excellent resistance to abrasion, impact, and compression. The entire sheave is manufactured from nylatron which has the following qualities: tough, wear resistant, high heat distortion temperature, vibration resistant, dimensional stability, chemical resistant. Therefore, this sheave can be used for almost all stringing applications, and cable placement.
For More Information about the XS-100-B Sheave Linings contact your local Sherman + Reilly Representative or call Sherman + Reilly directly at 1-800-251-7780.
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Please refer to the Product Sheet found on this page under Downloads