twin-path® slings in action - Hanes Supply, Inc

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YOUR SLING AND RIGGING SPECIALISTWire RopesSHEAVES SHOULD BE CHECKED FOR:1. Correct groove diameter2. Roundness or contour to give proper support to the rope3. Small holes, cracks, uneven surfaces, or other defects thatmight be detrimental to the rope4. Extreme deep wearA sheave should also be checked to make sure it turns freely,is properly aligned, has no broken or cracked flanges, and hasbearings that work properly.Drums should also be inspected for signs of wear that coulddamage rope. Plain-faced or smooth drums can developgrooves or impressions that prevent rope from winding properly.Repair by resurfacing the face or replacing the lagging.Scrubbing will occur if the rope tends to close wind. If the tendencyis to open winding, the rope will encounter abnormalabuse as the second layer forces itself down between the openwraps of the first layer on the drum.RIGHt WaY. Set the machinist's caliper to read thewidest diameter. Vernier scale reads to 1/128th of aninch.Operating with a smooth drum calls for special care. Be surethe rope is always tightly wound and thread laid on the firstlayer. Any loosening of the line is easily observed as the windingwill be bad and the rope will be coming off with a series of"bad spots."Grooved drums should be examined for tight or corrugatedgrooves and for differences in depth or pitch that could damagethe second and subsequent layers. Worn grooves can developextremely sharp edges that shave away small particles of steelfrom the rope. Correct this condition by grinding or filing a radiusto replace the sharp edge.Drum flanges, as well as the starter, filler and riser strips,should be checked. Excessive wear here often causes unnecessaryrope abuse at the change of layers and cross-overpoints.Other places of contact such as rollers, scrub boards, guidesand end-attachments should also be inspected.MEASURE THE WIDEST DIAMETERRopes and sheave grooves must be precisely fitted to eachother to get the most service out of your wire rope dollar. Makemeasurement of rope diameter a normal part of your inspectionprogram.There's only one right way to measure rope diameter: use machinist'scalipers and be sure to measure the widest diameter.The drawings at the left compare the right way with the wrongway.WRonG WaY. This is the wrong way to measurewire rope diameter. Widest diameter is not beingread.This method is not only useful for measuring the diameter of anew rope, but also for determining the amount of wear andcompression that has occurred while the rope has been in use.Accurate recording of this information is essential in helping todecide when to replace wire rope.HEADQUARTERS: 55 James E. Casey Drive • Buffalo, NY 14206 PHONE: 716.826.2636 FAX: 716.826.4412 www.hanessupply.com144
Wire RopesYOUR SLING AND RIGGING SPECIALISTCOMMON WIRE ROPE ABUSESNeglect and abuse are the two chief enemies ofwire rope life. One costly form of neglect is lack ofproper field lubrication. Abuse takes many forms:improper reeling or unreeling, wrong size or wornsheaves, improper storage, and bad splicing are afew.CONDITION OF MACHINERYWire rope performance depends upon the conditionof the equipment on which it operates; poorly maintainedequipment will usually result in reduced ropelife.EFFECTS OF SHOCK-LOADING ANDVIBRATIONThe destructive effects of jerking or shock-loadingare visually noticeable. Vibration has somewhat thesame effect, and is equally destructive. An individualshock may be slight, but many rapidly repeatedslight shocks can have the effect of several largeshocks.Vibration which occurs directly above a load is oftenunavoidable. "Whipping" of the section of rope immediatelyabove the load is also common. In thesecases, rapid wire fatigue is possible. For reasons ofsafety, this section should be examined regularly.Wire rope failure is usually cumulative. Each repeatedoverstress brings the rope nearer to failure.Thus, a wire rope may become fatigued to a pointclose to failure under a heavy load, and actually failunder a much lighter load.OVERSTRESSINGIn any hoisting operation, there should be no slackin the wire rope when the load is applied. Otherwise,the resulting stress will be excessive.Overstressing can also be the result of too-rapid accelerationor deceleration. Wire rope will withstandconsiderable stress if the load is applied slowly. Aswith ordinary twine, a quick snap will cause overstressingand breakage. This applies both whenstarting to lift a load, and when bringing it to a stop.CORROSIONCorrosion can seriously shorten wire rope life, bothby metal loss & by formation of corrosion pits in thewires. These pits act as stress-concentration pointsin the wires in much the same manner as do nicks.cRUsHInG. Because of loose winding on drum, rope was pulled inbetweenunderlying wraps and crushed out of shape.too sUDDen loaD Release. The sudden release of a load causedbirdcaging. Here individual strands open away from each other, displacingthe core.lack of lUbRIcatIon. Premature breakage of wires resulted from"locking" of strands, which was caused by insufficient lubrication.InfReQUent InsPectIon. Neglect of periodical inspection left thisrope in service too long, resulting in considerable abrasion.IMPRoPeR HanDlInG. Kink or "dog leg" was caused by improperhandling and/or installation. A kink causes excessive localized or spotabrasion.continued...HEADQUARTERS: 55 James E. Casey Drive • Buffalo, NY 14206 PHONE: 716.826.2636 FAX: 716.826.4412 www.hanessupply.com145
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twin-path® slings in action - Hanes Supply, Inc

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