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. The term cable is often used interchangeably with wire rope. Sizes smaller than this are designated as cable or cords. Typically, the number of wires in a strand is 7, 19 or A group of strands laid around a core would be called a cable or wire rope.
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Minimum breaking strength and safe load for Bright wire, uncoated, fiber core FC wire rope, improved plow steel IPS :.
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Our community is FREE to join. To participate you must either login or register for an account. Login or Register. COM Enter keywords or a search phrase below: Search. Order Ascending Order Descending. Member since August From: Toronto. Help, please. Posted by bondoman on Friday, October 30, PM.
Buy some really thin armature wire- should always have a supply anyhow. Three strands, twist and there you go. Plus unlike thread it will go where you want it to. That sounds perfect.
BGuy wrote: That sounds perfect. I buy at an electronics store, the kind where the genius geeks go, but they aren't hard to find. It comes all the way down to 40 gauge, which is 3 thousands. Great stuff for ignition harness, cockpit pipe. Member since May Posted by tucchase on Saturday, October 31, AM. It's strand wire, usually Stainless, in various diameters like 0.
Find Jobs. We don't save this data. I think I will never do a towing dio though, even if I can remember all the steps, method, and names. It would be an honor indeed, and a once in a lifetime experience; to sail on that tow. In fact I assisted another U-Boat author in his theory on how that boat was really killed. For reasons of competitive fairness, direct communication between proposers and topic authors is not allowed starting May 31, when DoD begins accepting proposals for this BAA.
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6x19 & 6x36 Classification Wire Rope - Wire Rope - Products
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. The term cable is often used interchangeably with wire rope. Sizes smaller than this are designated as cable or cords.
Typically, the number of wires in a strand is 7, 19 or 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 7x19 cable: 7 strands with 7 wires in each strand would be a 7x7 cable. 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.
This is used where corrosion is a prime factor and the cost increase warrants its use. Type is used where non-magnetic properties are required, however, there is a slight loss of strength. 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. A 1x7 or a 1x19 strand, having 7 and 19 wires respectively, is used principally as a fixed member, as a straight linkage, or where flexing is minimal.
Cables designed with 3x7, 7x7 and 7x19 construction provide for increasing degrees of flexibility but decreased abrasion resistance. These designs would be incorporated where continuous flexing is a requirement. 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:. Wire rope in service is subjected to several kinds of stresses. As the strength of a wire rope is determined by its, size, grade and construction, these three factors should be considered. The safety factor is the ratio of the strength of the rope to the working load.
A wire rope with a strength of 10, pounds and a total working load of 2, 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 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. 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 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.
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. 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. 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 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 times the diameter of the outer wires in the rope for heavily loaded fast-moving ropes.
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. 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. If loads are light, one-quarter percent or. With heavy loads, this stretch may approach one percent, or. 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. 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.
The performing operation removes the natural tendency of the wires and strands to straighten, and causes them to retain their proper positions.
Cable Construction Description Basic strand for all concentric cable, relatively stiff in larger diameters, offers the least stretch. Stiffest construction in small diameters. Durable, higher flexibility and abrasion resistance. Good general purpose construction for strength and flexibility. Can be used over pulleys. The rope should possess: Strength sufficient to take care of the maximum load that may be applied, with a proper safety factor.
Ability to withstand repeated bending without failure of the wire from fatigue. Ability to withstand abrasive wear. Ability to withstand distortion and crushing, otherwise known as abuse. 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. With this in mind, the effects of bending may be classified as: Loss of strength due to bending. Fatigue effect of bending.
This may be expressed as:. Broken rope ends do not untwist, as do the ends of the non-preformed ropes. This increases the salvage value of broken 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. Removal of internal stresses increase resistance to fatigue from bending. It also permits the use of ropes with larger outer wires, when increased wear resistance is desired.
Basic strand for all concentric cable, relatively stiff in larger diameters, offers the least stretch.