small wire rope sheaves free sample

Primarily, we are an engineering firm.  We take your technical requirements for wire rope sheaves and translate them into cost effective solutions to meet or exceed the performance required of your application.

For years, Sheaves Inc. (Esheaves) has been the number one source for the wire rope industry, developing and providing custom engineered wire rope QSheaves™ that meet your specific needs and rigors of your application. We also supply a large inventory of stock sheaves from the best known brands in the industry.

Our expertise is based on decades of engineering and supplying leading manufacturers, from the simplest applications to the most demanding. We’ve supplied sheaves for a range of applications, from industrial machines, manufacturing equipment, and military applications, to recreational equipment, theater rigging, and large commercial boat lifts.

We pride ourselves on our quality products and excellent customer service, as well as our continual desire to look for innovative ways to meet your needs; achieved, for example, in our patented line of steel sheaves that allow us to provide an extensive range of 6” to 12” QSheaves™ to be shipped the same day.

In this video you’re going to learn about a way to cut the time it takes sell sheaves by 50% and expand your sheaves offering by at least one hundred percent

Today the wire rope sheave business has one problem that no one wants to talk about and that’s been okay because up until now no one could do anything about

The problem is availability of sheaves which after a hundred years are still made to order and delivered on a timetable measured in weeks rather then days

Oh what’s more is in an age where most sheave manufacturers are owned by private equity companies it’s becoming ever more rare to keep these sheaves in stock

But that’s not the worst of it, if you have a 1000 variations of sheaves available you might sell 200 of them in a given year that leaves 800 variations of sheaves unsold at a carrying cost of whatever your profit margins

In the rest of this video you’re going to learn abut a system for selling sheaves that’s so simple and profitable that even a person with minimum training could set up a store

At a thousand different combinations of rope size, bearing type, shaft size, hub width, you can see how it could reduce the conversation between the inside sales person and the potential customer too well something like this (clip from who’s on first)

Again, they should have all this information ready, if he doesn’t all he needs is a ruler and one extra minute to get these numbers for you with these five simple measurements you can give him the right one of any of a thousand versions of sheaves

In the case of sheaves, the two critical dimensions are the ones that prove your sheave will stand the test of time are groove dimensions and the bearing bore

Our solid steel sheaves are based on patented technology backed by 50 years of experience and have been battled tested in the harshest real world environments on earth and off earth

To sum it up, I am offering you an opportunity to become a leading distributor of 6 to 12 inch wire rope sheaves by selling the only product line offering a thousand configurations and shipping within 24 hours

A large variety of wholesale wire rope sheaves can be found at Alibaba. The stainless-steel license frame with an aluminum sheet shines brilliantly on the back of the vehicles, making them noticeable and remarkable on the road. The license plate bracket is designed to hold the license frame on the front of the vehicle.

We also have wire rope sheaves that can be customized with different designs, logos, and tags. The personalized license plate frames are very appealing to company owners such as car dealers because they can market their trademarks using customized wire rope sheaves on their professional vehicles. For luxury and prestigious models, we recommend wire rope sheaves like rhinestone license plate frames, silicone license plate frames, and diamond license plate frames. The vintage license plate frames add a retro aesthetic to vehicles. Explore more stylish license frames available at amazing bargains.

Depending on the paper machine and position of the rope sheave, the sheave may face higher operating temperatures, which will reduce the grease life. To increase grease life, the use of hybrid bearings (ceramic balls instead of steel ones) of the same size can increase the grease life by at least a factor of two.

By changing the rope sheave hub design so that the bearing’s inner ring rotates instead of the outer ring, grease life is increased. The speed factor will be ndm = 131 000 instead of nD = 176 400.

SKF has developed a rope sheave hub to take the above consideration into account. The bearings have ceramic balls, and WT grease, and their inner rings rotate (fig. 2). An enhanced design has been created using special bearings. For additional information refer to the handbook .

Multi-layer drum systems should use strand- or swage compacted Python® rope constructions having a steel core. The higher fill factor of such rope constructions will offer a greater resistance to crushing and flattening than conventional rope types. This is particularly important for boom hoist ropes on lattice boom cranes at the cross over point from one rope winding to the next.

Cranes equipped with multi-layer drum systems which require rotation-resistant or non-rotating rope are best served with Python Compac® 18 and Python Compac® 35. To further reduce drum crushing have the rope layers wound onto the drum with about 5-10% of the WLL and avoid that the first layer unspools and re-spools without tension. This would cause a ‘soft’ bottom layer which will flatten rather quickly.

Wire rope and cable are each considered a “machine”. The configuration and method of manufacture combined with the proper selection of material when designed for a specific purpose enables a wire rope or cable to transmit forces, motion and energy in some predetermined manner and to some desired end.

Two or more wires concentrically laid around a center wire is called a strand. It may consist of one or more layers. Typically, the number of wires in a strand is 7, 19 or 37. A group of strands laid around a core would be called a cable or wire rope. In terms of product designation, 7 strands with 19 wires in each strand would be a 7×19 cable: 7 strands with 7 wires in each strand would be a 7×7 cable.

Materials Different applications for wire rope present varying demands for strength, abrasion and corrosion resistance. In order to meet these requirements, wire rope is produced in a number of different materials.

Stainless Steel This is used where corrosion is a prime factor and the cost increase warrants its use. The 18% chromium, 8% nickel alloy known as type 302 is the most common grade accepted due to both corrosion resistance and high strength. Other types frequently used in wire rope are 304, 305, 316 and 321, each having its specific advantage over the other. Type 305 is used where non-magnetic properties are required, however, there is a slight loss of strength.

Galvanized Carbon Steel This is used where strength is a prime factor and corrosion resistance is not great enough to require the use of stainless steel. The lower cost is usually a consideration in the selection of galvanized carbon steel. Wires used in these wire ropes are individually coated with a layer of zinc which offers a good measure of protection from corrosive elements.

Cable Construction The greater the number of wires in a strand or cable of a given diameter, the more flexibility it has. A 1×7 or a 1×19 strand, having 7 and 19 wires respectively, is used principally as a fixed member, as a straight linkage, or where flexing is minimal.

Selecting Wire Rope When selecting a wire rope to give the best service, there are four requirements which should be given consideration. A proper choice is made by correctly estimating the relative importance of these requirements and selecting a rope which has the qualities best suited to withstand the effects of continued use. The rope should possess:Strength sufficient to take care of the maximum load that may be applied, with a proper safety factor.

Strength Wire rope in service is subjected to several kinds of stresses. The stresses most frequently encountered are direct tension, stress due to acceleration, stress due to sudden or shock loads, stress due to bending, and stress resulting from several forces acting at one time. For the most part, these stresses can be converted into terms of simple tension, and a rope of approximately the correct strength can be chosen. As the strength of a wire rope is determined by its, size, grade and construction, these three factors should be considered.

Safety Factors The safety factor is the ratio of the strength of the rope to the working load. A wire rope with a strength of 10,000 pounds and a total working load of 2,000 pounds would be operating with a safety factor of five.

It is not possible to set safety factors for the various types of wire rope using equipment, as this factor can vary with conditions on individual units of equipment.

The proper safety factor depends not only on the loads applied, but also on the speed of operation, shock load applied, the type of fittings used for securing the rope ends, the acceleration and deceleration, the length of rope, the number, size and location of sheaves and drums, the factors causing abrasion and corrosion and the facilities for inspection.

Fatigue Fatigue failure of the wires in a wire rope is the result of the propagation of small cracks under repeated applications of bending loads. It occurs when ropes operate over comparatively small sheaves or drums. The repeated bending of the individual wires, as the rope bends when passing over the sheaves or drums, and the straightening of the individual wires, as the rope leaves the sheaves or drums, causing fatigue. The effect of fatigue on wires is illustrated by bending a wire repeatedly back and forth until it breaks.

The best means of preventing early fatigue of wire ropes is to use sheaves and drums of adequate size. To increase the resistance to fatigue, a rope of more flexible construction should be used, as increased flexibility is secured through the use of smaller wires.

Abrasive Wear The ability of a wire rope to withstand abrasion is determined by the size, the carbon and manganese content, the heat treatment of the outer wires and the construction of the rope. The larger outer wires of the less flexible constructions are better able to withstand abrasion than the finer outer wires of the more flexible ropes. The higher carbon and manganese content and the heat treatment used in producing wire for the stronger ropes, make the higher grade ropes better able to withstand abrasive wear than the lower grade ropes.

Effects of Bending All wire ropes, except stationary ropes used as guys or supports, are subjected to bending around sheaves or drums. The service obtained from wire ropes is, to a large extent, dependent upon the proper choice and location of the sheaves and drums about which it operates.

A wire rope may be considered a machine in which the individual elements (wires and strands) slide upon each other when the rope is bent. Therefore, as a prerequisite to the satisfactory operation of wire rope over sheaves and drums, the rope must be properly lubricated.

Loss of strength due to bending is caused by the inability of the individual strands and wires to adjust themselves to their changed position when the rope is bent. Tests made by the National Institute of Standards and Technology show that the rope strength decreases in a marked degree as the sheave diameter grows smaller with respect to the diameter of the rope. The loss of strength due to bending wire ropes over the sheaves found in common use will not exceed 6% and will usually be about 4%.

The bending of a wire rope is accompanied by readjustment in the positions of the strands and wires and results in actual bending of the wires. Repetitive flexing of the wires develops bending loads which, even though well within the elastic limit of the wires, set up points of stress concentration.

The fatigue effect of bending appears in the form of small cracks in the wires at these over-stressed foci. These cracks propagate under repeated stress cycles, until the remaining sound metal is inadequate to withstand the bending load. This results in broken wires showing no apparent contraction of cross section.

Experience has established the fact that from the service view-point, a very definite relationship exists between the size of the individual outer wires of a wire rope and the size of the sheave or drum about which it operates. Sheaves and drums smaller than 200 times the diameter of the outer wires will cause permanent set in a heavily loaded rope. Good practice requires the use of sheaves and drums with diameters 800 times the diameter of the outer wires in the rope for heavily loaded fast-moving ropes.

It is impossible to give a definite minimum size of sheave or drum about which a wire rope will operate with satisfactory results, because of the other factors affecting the useful life of the rope. If the loads are light or the speed slow, smaller sheaves and drums can be used without causing early fatigue of the wires than if the loads are heavy or the speed is fast. Reverse bends, where a rope is bent in one direction and then in the opposite direction, cause excessive fatigue and should be avoided whenever possible. When a reverse bend is necessary larger sheaves are required than would be the case if the rope were bent in one direction only.

Stretch of Wire Rope The stretch of a wire rope under load is the result of two components: the structural stretch and the elastic stretch. Structural stretch of wire rope is caused by the lengthening of the rope lay, compression of the core and adjustment of the wires and strands to the load placed upon the wire rope. The elastic stretch is caused by elongation of the wires.

The structural stretch varies with the size of core, the lengths of lays and the construction of the rope. This stretch also varies with the loads imposed and the amount of bending to which the rope is subjected. For estimating this stretch the value of one-half percent, or .005 times the length of the rope under load, gives an approximate figure. If loads are light, one-quarter percent or .0025 times the rope length may be used. With heavy loads, this stretch may approach one percent, or .01 times the rope length.

The elastic stretch of a wire rope is directly proportional to the load and the length of rope under load, and inversely proportional to the metallic area and modulus of elasticity. This applies only to loads that do not exceed the elastic limit of a wire rope. The elastic limit of stainless steel wire rope is approximately 60% of its breaking strength and for galvanized ropes it is approximately 50%.

Preformed Wire Ropes Preformed ropes differ from the standard, or non-preformed ropes, in that the individual wires in the strands and the strands in the rope are preformed, or pre-shaped to their proper shape before they are assembled in the finished rope.

This, in turn, results in preformed wire ropes having the following characteristics:They can be cut without the seizings necessary to retain the rope structure of non-preformed ropes.

They are substantially free from liveliness and twisting tendencies. This makes installation and handling easier, and lessens the likelihood of damage to the rope from kinking or fouling. Preforming permits the more general use of Lang lay and wire core constructions.

Removal of internal stresses increase resistance to fatigue from bending. This results in increased service where ability to withstand bending is the important requirement. It also permits the use of ropes with larger outer wires, when increased wear resistance is desired.

Outer wires will wear thinner before breaking, and broken wire ends will not protrude from the rope to injure worker’s hands, to nick and distort adjacent wires, or to wear sheaves and drums. Because of the fact that broken wire ends do not porcupine, they are not as noticeable as they are in non-preformed ropes. This necessitates the use of greater care when inspecting worn preformed ropes, to determine their true condition.

(a) Factor of Safety. All rope to be used for regular hoisting shall be wire rope providing a factor of safety not less than five to one for material hoist and ten to one for personnel hoist when new, which shall be calculated by dividing the breaking strength of the wire rope as given in the manufacturer"s published tables, by the total load to be hoisted including the total weight of the wire rope in the shaft when fully let out, plus a proper allowance for impact and acceleration.

(b) Wire Rope Fastenings. Every wire rope used for hoisting shall be securely fastened at both ends and when in use shall not be fully unwound; at least three full turns shall remain on the drum so as to protect the end fastening at drum from overload. The wire rope end at the cage, skip or bucket shall be securely fastened by a properly made tapered socket joint, by an eye in the wire rope made with an oval thimble and wire rope clips, or by another method acceptable to the Division for this or similar service. If the wire rope clip method is used, the spacing and number used shall be as shown in Table - 1 for U-Bolts and in Table - 2 for Fist-Grip clips based upon using RRL or RLL wire rope, 6 x 19 or 6 x 37 Class, FC or IWRC; IPS or XIP. If Seale construction or similar large outer wire type construction in the 6 x 19 Class is to be used for sizes 1 inch and larger, add one additional clip. If a pulley (sheave) is used for turning back the wire rope, add one additional clip.

The number of clips shown also applies to rotation-resistant RRL wire rope, 8 x 19 Class, IPS, XIP, sizes 1-1/2 inch and smaller; and to rotation-resistant RRL wire rope, 19 x 7 Class, IPS, XIP (sizes 1-3/4 inch and smaller for U-Bolts and size 1-1/2 inch and smaller for Fist Grips).

(d) Splicing. Spliced wire rope shall not be used, except that the end may be attached to the load by the thimble and/or clip method, as provided in subsection (b) of this section.

(1) A safety hook, shackle or other means providing closed design protection shall form the attachment between rope and a bucket, cage, skip or load. The attachment shall be made so that the force of the hoist pull, vibration, misalignment, release of lift force, or impact will not disengage the connection. Moused or open-throat hooks with light safety latches do not meet this requirement.

(2) All wire rope fittings and connections shall be in accordance with the manufacturers" specifications and compatible with the type of wire rope used.

(g) Drum Flanges. The drum of any hoist used for hoisting shall have flanges which extend at least 2 inches radially beyond the last layer of rope when all the rope is coiled on the drum.

While sheaves may be a relatively small piece of hardware, they play a crucial part in mechanical engineering and lifting equipment. They are used in tandem with a rope, belt, or cable to lift items with a crane.

Essentially, a sheave is a wheel with an open groove that a rope or cable fits around so it can rotate around the exterior. One end of the cable is attached to an item that needs to be moved, while the other is attached to a fixed object, like the base of a crane. The cable smoothly moves over the wheel of the sheave as it is wound up on the fixed object, lifting the other object into the air.

Sheaves are also commonly known as pulleys, and when two or more pulleys are used together for extra strength, this is known as a sheave block. Rope pulleys were actually used as far back as the 1500s in order to hoist water out of wells, and they were likely used to lift and move heavy rocks that created Stonehenge in the UK.

You certainly want to purchase a sheave block that is durable and strong enough for whatever task you will be using it on. You also want to look out for a sheave with a smooth radius to reduce friction between the pulley metal and the cable or rope. It is also best to buy a sheave with rounded outside diameters as any sharp corners could damage or wear down the rope as it slides over the pulley.

A bearing is an axle inside of the pulley which helps to minimize friction as the cable or rope moves back and forth within the sheave block. There are several different types of bearings that are used for different applications.

There are also different shapes and styles of the grooves within the sheaves. These different styles are made to accommodate different types of ropes or cables, and it is best to choose a groove size that is 5% to 10% wider than the diameter of the rope used.

It is also very important to keep tabs on the groove’s wear and tear. Over time, it can wear down, especially if they are used with wire rope products – which cause additional abrasions. Excessive wear can break down ropes and cables much quicker.

There are also different shape styles of grooves. U-shared profiles are best for use with ropes since it prevents any pinching and allows the rounded shape to glide smoothly. V-shaped profiles are best for wire slings and cables.

As the name implies, normal duty sheaves are designed for moderate weight loads and “normal” duty applications. These sheaves are available in 76mm through 406mm (3” to 16”) wide sheaves and are often protected with sheave guards so the rope or wire being used stays in place.

There are five distinct types of bearing options on normal duty sheaves. Bearings are smaller circular pieces of metal that fit inside of the pulley to help it rotate.

Normal duty sheaves are made from machined ductile iron, which offers distinct advantages over other types of metals –, particularly steel. Ductile iron has a higher silicon content, which offers it more machinability and will often last longer than tools made of steel.

Heavy-duty sheave blocks are best for heavy-duty applications with thicker ropes and cables and heavier weight bearings. They are available in 102 mm through 305 mm (4” through 12”), and are often used in work environments where the sheave block will be operating continuously.

Heavy-duty sheaves use closed die forging, which means that the hot metal is poured on dies (or molds) and forged into particular shapes. This helps to strengthen the shape of the tool since it does not need to be welded together in multiple pieces.

Domed sheaves are reinforced for extreme duty applications. These sheave blocks are welded in a circular pattern, which reduces additional stresses made by welding ribs. Domed sheaves are also the largest and are available in 610 mm (24”) and larger sizes.