open the calculator open the calculator More Freight Tools and Resources Whether you need a freight classification code, to learn the basics of less-than-truckload (LTL) freight shipping, or to look for the latest offers and resources — you can find everything here that you need to make your LTL freight shipping easy. As the angle decreases the stress imposed on the leg of a sling increases. Wire rope and cable are each considered a "machine". asked by PSS on November 11, 2015; Physics. Scientific Calculator Simple Calculator. Ta – dah! Clothesline bath rug. The nichrome melts the nylon rope very well, but in testing, the rope sometimes melted and then adhered to the nichrome wire. In 1960, the Lehigh Group launched the first line of consumer packaged rope under the Lehigh® brand to major retailers. Excellent abrasion resistance and strength, wet or dry. See our other Electronics Calculators. Ingersoll-Rand has reviewed and used drum storage formulas offered in engineering hand books and those of various wire rope manufacturers. Safe Working Load Limits- Terminology. Slings should have a minimum design factor appropriate to the type of material asspecified in the appropriate section. A rope bridge is a form of suspension bridge. Top Rated Plus. The metre, symbol: m, is the basic unit of distance (or of "length", in the parlance of the physical sciences) in the International System of Units. To find the area of the remaining grazing area (including the area of the barn, which you subtract later), you use integration. Mobile cranes) we recommend 'Lebus' grooving. We stock easy-to-use, high quality products including stainless steel cable or galvanised cable, wire rope fittings, cable assemblies, and wire rope tools. You can also select units of measure for both input data and results. A good jump rope is one of the best investments you can make in your own fitness because it is an extremely effective form of cardiorespiratory exercise and doesn't require much more than a little space, a timer and some creativity. Above: the tan calculator output for increasing angle values in degrees. Let be the impact force quoted by the manufacturer, which is normally 12 kN for a single rope. Click on calculate at the bottom of the form for your calorie calculator personal report; Knowing the number of calories you burn in conjuction with a sensible diet can help you lose or gain weight. 81 m/s2) = 29. For instance, when a rope is attached on an iron bar at one end and a is pulled by a vehicle on the other end of the rope. Providing wire or cable on reels or spools is the most common method of packaging used today. The other end of the rope is attached to a pulley. First input your health details including gender & height. Wire rope used with cranes operates as running rope (which travels around drums or sheaves) and standing rope. The earliest evidence of wire rope used in construction was found in the. The load is split into 2. I am looking for a formula to calculate the deflection(sag) in steel wire that is supported between two points with a known tension. When you're. Appendix D Wire Rope 1. With high-elongation rope in a raising system, the haul team has to pull the stretch out of the rope before moving the load, thus reducing the team’s efficiency. 6m and strikes a wall. The thought of calculating UK import duty and taxes fills many with dread, but it is not such a difficult task once you understand the basics. Skipping Rope Doesn't Skip Workout. Rope bridges rely on their connections at each end. A bucket with mass m 2 and a block with mass m 1 are hung on a pulley system. No more guessing! Quickly find the length of a roll by using this convenient roll length calculator. For kernmantle rope systems it is reasonable to assume that the mass of the line will be swamped by the applied mass of the load. However, due to the logistics required for this method to be effective it is a lot less popular than suspension hanging as a form of suicide. The rope is spooled properly and positively. Then in their simplified model, the maximum tension in the rope is. Go to the Android Market place and look for Djembe Rope Calculator Djembes - Drum Skins and Hides - Djembe and Djunjun Rope - Kpanlogo, congas, more Djembe Drums & Skins provides high quality rope tuned djembe and Dunun drums, drum tuning supplies and drum accessories at reasonable costs, for the love of drumming. The top supplying countries are China, Pakistan, which supply 92%, 7% of calorie calculator jumping rope respectively. Rope is the overwhelming favorite, usually with a length of chain at the anchor end. Jumping rope is a cardiovascular exercise that burns a ton of calories, up to 1000 calories per hour (!), and it works the arms, legs and core, as well as strengthening your bones and improving your balance. We have gleaned the best of these methods and offer this electronic calculator for our customer's convenience. Structural stretch is the lengthening of the lay in the construction of cable and wire rope as the individual wires adjust under load. In actual practice, drum capacities may be 25-30% less than the values given by this formula due to uneven spacing, loose winding and overlapping. Pulling Tension. The results of this calculator are approximations only. The building inspector needs to find the angle of the ramp to see if it meets. From China. Study the graph "Strength Efficiency of Wire Rope. If the calculator above didn't work for you for some reason (please let us know!) you can use the below formula with any values that you want. The nature of these products renders them difficult to calculate accurately. 0-kg person is being pulled away from a burning building as shown in the figure below. We use your calculator ideas to create new and useful online calculators. Scientific Calculator Simple Calculator. STEP 5: Check nut torque again after the rope has been in operation. 6 grams x 0. What does the flight profile look like? Something similar to this below. Wire rope, galvanized and ungalvanized is used for many kinds of projects and applications. Improve Calorie Calculator Calorie Calculator. 5X rope diameter clearance 1X rope diameter clearance Other -. ASM Weight Calculator. Use the calculator below to help work out what is the ideal rope for you. 1 This standard defines the minimum standards and performance specifications for lifting cables for sectional type doors when used as an integral component of a counterbalance system. People have constructed Yagi type antennas entirely of wire, hanging the elements from a rope between two trees. In physics, tension is the force exerted by a rope, string, cable, or similar object on one or more objects. The number of knots in the rope that were counted in 30 seconds, then, was equal to the speed of the ship in nautical miles per hour. 75 times the rope diameter. lbs of force. Calendars – online and print friendly – for any year and month. The rope selection calculator serves as an initial guide to selecting a rope. Forestry; Construction & Civil Works; Shipping & Marine. 5, then dividing that number by 200. of the desired stranded conductor and multiply this dimension by the indicated factor for the number of conductors to be in the cable. In this activity we will examine the precise relationship between tension (T) the force applied to the string, the wave speed (v w) and the linear mass density of the string (µ = m/L which is measured in kg/m). com for fast and easy ordering with next-day delivery available. The 3/8-inch sisal rope is thicker and more durable. For these applications, safety factors of 3. Moving Supply Calculator. 1983, STANDARDS FOR LIFE SAFETY ROPE AND EQUIPMENT FOR EMERGENCY SERVICES, 2006 Edition. Just enter the value of the circumference. This Jump Rope Circuit Workout includes a mix of both jumping rope and total body strength exercises for a fast-paced, whole-body workout. This calculator helps you to find cable or conductor length based on the cable span and cable sag. From statistics, to algebraic, to engineering, we have a scientific calculator that fits your every need. One idea is to use rope jumping after each weight lifting set or another circuit exercise. The first one is the simplest (and is also the formula used in the calculator above), and the second is almost as much so. Calculators for roofs and floors are also available. The Prop Protector is a simple shaft driven rope cutter, rotating with the shaft and instantly cutting any rope, weed or debris picked up or snagged by the propeller. Rope strength is the approximate average for new rope tested under ASTM test method D-6268. If not enough fleeting is allowed in the hardener, gradually through the day, the peak is tensioned to take up the creeping stretch till the hardener is block-a-block and the main still looks like a bag of spuds. Calculate the tension in the rope. Extra maintenance winding is to maintain at least three wraps of wire rope on the drum to anchor the end of the wire rope securely when unwinding entire wire rope. What are calories? A calorie is a measure of energy, just as a pound is a measure of weight and a mile is a measure of distance. Extra maintenance winding is to maintain at least three wraps of wire rope on the drum to anchor the end of the wire rope securely when unwinding entire wire rope. We use your calculator ideas to create new and useful online calculators. The Calorie Burned Calculator is used to estimate the number of calories burned after exercise. The length of a rope lay is the distance measured parallel to the center line of a wire rope in which a strand makes one complete spiral or turn around the rope. The rotation char-acteristics of wire rope are critically. So far on this page we have used kilograms to represent the loads in the illustrations. Although the RoPE score was not designed to predict treatment effect, other studies have looked at predictors of recurrence in PFO-related stroke (Thaler 2014), which may help in deciding which patients may be appropriate for PFO closure. Describe the tension in a rope held at more than two points. Do not use decimal values (unless entering metric values), do not include any bumps or other protruberances in the measured diameter Large End Diameter:. Engineering wire rope slings for your application is a highly specialized field. The profile of the groove in a sheave should support the entire rope. By signing up, you'll get. Fiber line and wire rope were discussed in chapters 4 and 5. The mobile app has more customization options. Moving Supply Calculator. HOW TO SIZE YOUR RX JUMP ROPE: Figuring out the right jump rope size can be a tricky task. Wire rope design and construction characteristics shown in this. torque factor Verotop and Verotop P are rotation resistant ropes with a steel core closed in the opposite direction to the outer strands. asked by PSS on November 11, 2015; Physics. Wire gauge calculator Voltage drop calculations DC / single phase calculation. Our new Log Impact Force Calculator is a great tool for estimating peak loads on your rigging lines. Don't hold me responsible if you come up short. Along the top side, five meters of rope will be stretched along the side, leaving another three meters "in play"; along the right-hand side, four meters will have been used, leaving another four meters:. Calorie(Kcal) ＝ BMR X Mets/24 X hour ※This site shall not be liable for any damages arising out of the use this library. Used in a basket hitch with the legs at a 90° angle to the load, it would have a working load limit of 1,000 lbs. Calculate. The calculator's calculations are based on the Circumference Method, developed by the military (U. Use the calculator below to find the total wattage and amperage requirements of your lighting project! Example: An upcoming project requires 20 ft of 120 Volt LED Rope Light. The Prop Protector is a simple shaft driven rope cutter, rotating with the shaft and instantly cutting any rope, weed or debris picked up or snagged by the propeller. The source for medical equations, algorithms, scores, and guidelines. has been a leader in the wire rope and rigging industry. 58, calculate the tension in the table. Pull down on the rope as you take a small jump. Here is an example of how the calculator works on a gold conversion. Guy wires are used to keep poles from leaning when a power line goes around a curve in the road or along a right of way. Horizontal Pulley with Friction Application of Newton's second law to a horizontal pulley. A Barrel diameter: B Flange diameter: C Drum length: D Freeboard: Full_Drum ANSI B30. Our calculations (below) show, that slopes of more than 5° already need large hauling teams and a slope of 10° needs over 400 men!. Yes, you’ll look ridiculous, but this is a great way to practice your jump and proper form. A wire rope that has been subjected to repeated bending over sheaves under normal loads. The 3/8-inch sisal rope is thicker and more durable. Win $100 towards teaching supplies! We want to see your websites and blogs. The drum width, cable wrapping diameter, drum, diameter, and rope diameter should all be in inches. Calculate the tension T in the rope if the gymnast slides down the rope with a downward acceleration of magnitude 1. In this scenario, if the nichrome wire does not cut the rope cleanly, you've got the payload attached to the balloon via the lead wires and things go topsy-turvy. Try taking an imaginary jump rope and pretending to turn it over your head and jump rope with it. You calculate it by determining the force of gravity from the load, plus the effect of any accelerations and other forces acting on the rope. com for fast and easy ordering with next-day delivery available. What size rope should I use? 1/4-inch and 3/8-inch are the typical sizes used for scratching posts. Import duty and taxes – what are they?. Anything pulled, hung, supported, or swung from a rope, string, cable, etc. After 30 minutes, rope A will be completely burned up and there will be 30 minutes of rope B left. 141592653589793 Therefore, the circumference depends only on the size of r. For the noseband measurement, start underneath one cheekbone, and measure all the way around the nose back to the same cheekbone. I want to be able to calculate the deflection(sag) at any point along the wire. Breaking strength for all three wire core halyards is only as strong as the wire inside which is 900 lbs. Use this R Value Calculator to determine the effective R value and cost of wall assemblies quickly and easily. I'm looking into buying a rope for rock climbing, and I know that I need a dynamic rope for lead climbing. After you have made your decisions on outlet locations and cable types, you need to determine how much cable you need for wiring the home. Free shipping. For group play with two rope turners, you need a long rope or two long ropes of equal length to jump double Dutch. It mainly plays a role in improving, traction, tension and carrying. , in the above example, the 100-pound load is generating approximately 380 pounds of force). Not all holes have a rope spot, and not all rope spots are under a hole. A gymnast of mass 66. lbs of force. Above: the tan calculator output for increasing angle values in degrees. Study the graph "Strength Efficiency of Wire Rope. The Konecranes range of CXT wire rope hoist cranes are ideal in nearly any industrial setting where you need a lifting capacity of up to 80 tons. Use this free online calculator to determine your score on the UBRR (Upper Body Round Robin) PT test. Clair Kilby. Diameter Tolerances. Navy and U. The number of calories you burn from jumping rope 600. the handcrank, the paddle attached to the driven pulley will move 1 revolution. In this demonstration you can see that winching with an extreme side angle for a long period without correctly spooling the winch line causes the line to bunch on one side of the drum. Improved Plow Steel Wire Rope Improved plow steel wire rope is one of the best grades of rope available and is the most common rope used in the NCF. Do not use decimal values (unless entering metric values), do not include any bumps or other protruberances in the measured diameter Large End Diameter:. You understand that the calculator provided is for general sling length and size suggestions. Many internal-gear hubs listed and some of the cassettes are no longer in production. Page 2 of 7 Pigeon Mountain Industries, Inc. Calculate the tension T in the rope if the gymnast climbs the rope at a constant rate. The force gain would be extreme besides being counter-productive since there is risk of a riding turn, result being that the sheet will foul, form a knot and not run out when eased (by slacking grip on the tail (free end)). , in the above example, the 100-pound load is generating approximately 380 pounds of force). ITT Enidine Capabilities Brochure [972 kb]. Cable length in any transmission line between two point will always be larger than the original length between the two points as there will be certain sag involved. This is a great tool to use when teaching fall protection courses or trying to determine the proper lanyard lenght and fall limiting device combination. Calories burned jumping rope calculator on Captain Calculator | Calories burned by the person 's body weight in kg and 3. A Union sling can meet or exceed the most exacting specifications. 00 mt 5 10 11 6 x 19 sc 1. We have one mat in our master bath, but when it’s in the wash I usually just use a towel on the floor. The calculator's calculations are based on the Circumference Method, developed by the military (U. Endless wire rope Endless-shape wire rope manufactured by using a special process. has been a leader in the wire rope and rigging industry. This can make it confusing to determine the length of rope light that you will need for your project needs. In a short amount of time you can size your jump rope to your height and be ready to workout. Countdown of skipping times: Set the fixed skipping time to calculate the time consumed. Looping the rope over the head of the reel or pulling the rope off a coil while it is lying on the ground, will create loops in the line. is subject to the. It would be nice if I could have a little help with this physics question I have, it's driving me crazy @ _ @. Use the grams per meter number and the length of a rope to calculate a rope's overall weight. There are three equivalent ways to determine this torque, as shown in the diagram below. The rotation char-acteristics of wire rope are critically. To account for the effect of bend radius on wire rope strength when selecting a sheave, use the table below: Fatigue Life Repeated bending and straightening of wire rope causes a cyclic change of stress called "fatiguing. like the other strands of the rope. Win $100 towards teaching supplies! We want to see your websites and blogs. Does Sizing Change For Someone With Long Or Short Arms? Actually, no. Use a tape measure then enter your waist, hip, and neck measurements. Adding a splice to your rope will ensure your rope loop is as strong as possible. For group play with two rope turners, you need a long rope or two long ropes of equal length to jump double Dutch. Download this document in PDF format. This calculator estimates the pulling tension necessary to pull cable through inputted sections. It can help to determine your more precise calorie consumptions by specify heart. Lumber can be used in a variety of home projects, from framing to building a deck. Force and Tension in Rope due to Angle - Reduced load capacity in ropes, cables or lines - due to angle; Manila Rope - Strength - Manila 3-strand rope - minimum breaking strength and safe load; Nylon Rope - Strength - Nylon 3-strand and 8-strand rope - minimum breaking strength and safe load. Depending on the drum/rope diameter relationship helix-grooved drums can be used for up to 3 layers without excessive rope wear. Wire Rope tension (force) is efficiently transferred over a significant distance, which is the length of the rope. Apr 1, 2016- Explore wahinevet's board "Nautical Pilings" on Pinterest. The first one is the simplest (and is also the formula used in the calculator above), and the second is almost as much so. See How Much weight can you lose doing popular things like… Having Sex. DRAKO Rope Elongation Calculator (Login) If you do not have a username and password to access the program please use the PDF-form first. It is expressed in the D/d ratio mentioned earlier in which D is the pitch diameter of the sheave and d is the diameter of the rope. Three strands are then wound together to form the rope. Consult cardiology for patients in whom suspicion for PFO-attributable stroke is high based on the RoPE score. HOW TO SIZE YOUR RX JUMP ROPE: Figuring out the right jump rope size can be a tricky task. Breaking strength for all three wire core halyards is only as strong as the wire inside which is 900 lbs. 1 This standard defines the minimum standards and performance specifications for lifting cables for sectional type doors when used as an integral component of a counterbalance system. I have found several discussions on how to calculate the sag of rope that is tied off at two points (like a tightrope), and I understand it to a certain extent. The standard long rope for one jumper is 12 feet. For a 26mm wire rope to escape bend fatigue the winch drum or block sheaves over which it runs would need a mini-mum diameter of over 1. Use nylon rope only. Sort by: Dyneema® ropes are made from Ultra High Molecular Weight Polyethylene, or UHMWPE fibers. Enter your capacity Amp-Hours and your discharge in Amps in the form below and press the "Compute" button. We have two 18" lengths to wrap completely by coiling the rope around it. Calorie Intake Calculator. Wire rope is an essential ingredient in most modern construction, and historically served a variety of purposes, leading to the development of shipping, railroading, elevators, telegraphs, mining, cable cars and airplanes. If you want to stick to rope, an alternative rope that can be used for the same purpose is the hemp rope, though it has no significant advantage compared to sisal. The faster the ship was sailing, more knots and a longer length of rope were played out. The drum width, cable wrapping diameter, drum, diameter, and rope diameter should all be in inches. You agree that your ultimate purchase and use of Lift-All slings must be determined by you to be appropriate for your specific applications. This calculator estimates the amount of elastic stretch experienced by 7x7 stranded wire rope constructed from 302/304 stainless steel that has been proof loaded to 60% of its breaking strength to remove constructional stretch. Attaway Abstract This paper presents an analysis of the loads in a typical climbing rope system subjected to a dynamic loading from a fall. And since most of us forget our formula and calculator on how to calculate the tension (related to tensile strength - breaking of rope or cable ) because we seldom use it. Online STS Risk Calculator. See our other Electronics Calculators. Calculate your keto macros in less than a minute. Example: If a rope has a diameter of. Highly demanded for material handling, ship building, defense ports, shipping and other several industries, this rope is manufactured well using optimum quality polypropylene. WIRE ROPE SLINGS GENERAL INFORMATION 2-1 2 Figure 1. For example all wire rope suffers from being bent and the smaller the bend radius the shorter the rope life. Posted Friday, 16 October, 2009. We provide a broad range of products including valves, flanges, fittings, tubing and couplings in metric JIS and DIN, and ANSI standards. All of the efficiencies listed herein either correspond with or take precedence over previously published figures. Apr 1, 2016- Explore wahinevet's board "Nautical Pilings" on Pinterest. Re: Convert falling pounds to kilonewtons Hi, I just came across this thread as I was looking for something to calculate the compressive force produced with a climber landing on a bouldering mat. Some winches come from factory with a synthetic rope such as AmSteel braided Rope, which has many advantages over wire rope including increased strength, lighter weight and does not recoil like steel rope if it breaks during a pull. Resulting plotted points landing within a wire rope class band indicate uncertain stability for that rope class. A wide variety of calculator with rope options are available to you, such as plastic, rubber. The earliest evidence of wire rope used in construction was found in the. In 1974 a basic patent for miniature electronic calculators has been issued to Texas Instruments Incorporated. The Friction Calculator an online tool which shows Friction for the given input. Although each cat is different from another and has preferences, overall most of the cats prefer sisal rope to any other materials and on top of this, sisal rope has a lot of advantages. Lumber Calculator. in a vertical hitch. Determine the minimum length of the rope l, between A and B, so that the tension in either AB or AC equals the tension in Newtons given in P9. Bend Radius Calculator. Points above the band will most likely be unstable. Besides, the step by step calculation for each calculation performed by using this calculator let the users to know how to perform belt or rope friction calculation. Bend Radius. Sling Pro is an excel spreadsheet for the design of 4 leg wire rope and chain lifting slings in accordance with DNV and EN onshore and offshore international codes. Used to lift parallel loads, both lengths have the same amount of tension. Age, usage, and type of termination used. Calculate The Right Scope. Mechanics and Machines Calculations Menu. 01X Fall Term 2002 SOLUTIONS TO PROBLEM SET 4 1 Young & Friedman 526 A box of bananas weighing 40. Use at your own risk. You can use a calculator to find this value, but make sure your calculator is set to the same unit as your angle measurement (degrees or radians). Standard for Lifting Cables for Sectional Type Doors 1. If the calculator above didn't work for you for some reason (please let us know!) you can use the below formula with any values that you want. The standard long rope for one jumper is 12 feet. You won’t have to tie knots that will shorten your rope and might not hold. Further more the only external force. Calculates the rolled length of a roll of material when the outside diameter of the material, thickness of the material, and the diameter of the hole in the center or the tube on which the material is wound are given. Calculator Ideas. Start by entering the length of rope light that you would ideally like to have, then enter the cutting interval for the product and color that you are looking at. Wire rope design and construction characteristics shown in this. to calculate the swl of lifting wire rope the formulae can be used- 8*d2 where 'd' is the diameter of wire rope in 'mm' this will give the approx swl (safe working load capacity). The hanging weight has a mass of 3. Wire rope is not termed oversize until its diameter exceeds the allowable maximum. Typically an actuate model would ask for weight, fall factor, top piece friction coefficient (or is fixed at 0. Rope is the overwhelming favorite, usually with a length of chain at the anchor end. In this class of problems, we are given a slope or ramp with some dimensions known, and we are asked to find the angle of the slope or ramp. Find calories burned from hundreds of activities in MyFitnessPal. The calculator displays the cable sag in absolute units as well as a percentage of total cable length ("measurement error"). This rope has a moderate elasticity which allows it to arrest a climber fall without large shock loading thus minimizing the force on the climber. In this problem, you are asked to relate motion (the acceleration of the two blocks) to force (tension in the rope, friction). Used in a choker hitch, it would have a capacity of 375 lbs. Determine whether the rope has 6, 8 or 9 strands by looking at the shackles where the stranding is easier to see. Wire rope is an essential ingredient in most modern construction, and historically served a variety of purposes, leading to the development of shipping, railroading, elevators, telegraphs, mining, cable cars and airplanes. The Safe Working Load is the mass that lifting equipment, usually a wire cable, can safely hold without fear of breaking. Lumber Calculator. Points above the band will most likely be unstable. We derive values for axial stiffness in different ways for fibre and wire ropes. 1983, STANDARDS FOR LIFE SAFETY ROPE AND EQUIPMENT FOR EMERGENCY SERVICES, 2006 Edition. Scientific Calculator Simple Calculator. They are also used in robotics to calculate robot arm kinematics. Also see side view. Use this free online calculator to determine your score on the UBRR (Upper Body Round Robin) PT test. X-Ray Barrier Calculator. In an everyday kind of situation, if you are cutting down a tree and want to tether the top to the ground with rope at an X angle, use the tan function to calculate how much rope you would need. Wire Rope Calculator. We are the high-performance stainless steel and galvanized wire rope manufacturer from China and specializing in wire rope, crane ropes and rope sling. com's exercise database. Sling Calculator Mobile app now available, search for Sling calculator and download for free! William Hackett Sling Calculator is a free app that lets you configure your chain or wire rope sling by taking you through a number of steps. This calculator calculates an estimate of the number of calories burned in various activities. Use the gold gram calculator to see how much your items are worth per gram of gold, or to figure what you might be willing to pay based on the cost of gold per gram. After 30 minutes, rope A will be completely burned up and there will be 30 minutes of rope B left. single-family home is a 4 bed, 3. Get the result. Bend Radius Calculator. This form of stretch can be completely removed by applying a cable or wire rope prestretching operation prior to shipment. Primary barrier thickness (concrete): cm. The wizard determines the current limiting resistor value for each portion of. Can be traded with the Twin Crows at Firelink Shrine for a Titanite Chunk. Wire rope refers to the steel cable included with most winches. Calculate The Right Scope. A horizontal steel cable is used to drag a bucket filled with coal along the grould at a constant speed. Gunnebo Johnson Corporation furnishes ForgeFab™ sheaves both as popular products in their own right and as the original equipment most preferred by major O. Lift-All makes no guarantees that the information provided in the calculator is correct. For this to happen, it is best to use a jump rope that will give the jumper the most control over the rope. Call this factor n. ‘V’ groove sheaves should be avoided since they compress the rope and have points of local friction reducing the life of the rope.