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To convert breaking strain to safe working load you must establish a safety factor (SF). Assume SF of 10. If a line has a breaking strain of 1 tonne then you should only suspend or load the line to a strain of 100Kg (1000Kg/10) A common SF for normal use is 6. If human loads are in use then SF 10 is more common.
Wiki User
∙ 15y ago
Wiki User
∙ 13y agoNo. There should always be a margin between safe working load and breaking strain, in case the load is heavier than you thought, or if the rope is beginning to get a bit frayed and worn.
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What will be the breaking strength of wire rope sling if SWL of wire rope sling 8T and factor of safety is 5?
1.6 ton The answer would be 40T, 1.6T is the WLL or SWL of an 8T nominal breaking strength rope.
How do you measure breaking strength of rope?
Suspend a weight on the rope and slowly increase the weight untill the rope breaks. If you want a more scientific approach you can use a tensile testing machine.
What size cable do you need to support 4000 pounds with four points of contact?
Using 6x19 fiber core steel rope, you need only 1/4" which has a breaking strength of 6,020 pounds. Each cable must be able to support the full weight of the load; however, shock loading also needs to be considered. With this in mind you should use 1/2" steel rope (23,600 pound) to lift/suspend this load.
How do you calculate the mechanical advantage of block and tackle?
Let's look at a simple system. A block with three wheels is attached to the ceiling and a block with three wheels is attached to a load to be lifted off the floor. As well as the block attached to the ceiling, we have a hook there also near to the block and we start by knotting one end of our rope onto that hook. We now run the free end of the rope through the bottom block, back up through the top block, back down to the bottom block and so on, finishing up with the free end of the rope coming out of the third wheel at the top and hanging down. Now for the physics. Physics says that a well oiled pulley wheel cannot alter the load in a rope passing over it. Therefore, we have to accept that the load in any part of the rope is the same. Now we count how many lengths of rope are going to be lifting the load. I see six. Three wheels in the bottom block and two lengths of rope to each wheel. As these six ropes are all pulling upwards when we pull down on the free end, and the load in each rope is the same, the load in the rope is one sixth of the weight to be lifted. This is the pull required on the free end just to hold the load off the floor. A sightly greater pull will overcome any friction in the pulleys and start the load moving upwards. The mechanical advantage of the system we have here is 6. An interesting variation is when we have four wheels in the bottom block and pass what was the free end hanging down through the fourth wheel. We now have the free end to be pulled upwards and it will be contributing to the lifting forces on the weight. There are now eight lengths of rope lifting the weight and the pull required will be just a tad more than one eighth (1/8) of the weight to be lifted.
How do you measure tensile strength of a solid?
The same way that you test the tensile strength of anything - break it in a universal testing machine! You have to be careful how you hold the rope though - you obviously cannot grip it the way you would grip a metal specimen (since the grips will cut the rope). Therefore the rope may be locked into special rope-testing grips or tied around a T-bar or pin in a particuar way. As long as the rope breaks n the central "guage length", you have a good result. If it breaks in the region where it is gripped or tied, the result is probably not correct.
What is the safe working load for a 1 diameter IWRC 6 19 wire rope?
The safe working load can be calculated using the 6 x 19 &. 6 x 36 classification.
A wire rope sling with a strength of 10000 pounds and a total working load of 2000 pounds has a design factor of what?
5
How do you calculate SWL?
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)
What is the design factor of a wire rope sling with a strength of 10000 pounds and a total working load of 2000 pounds?
a multiplier of 5
What is the tension of the rope in a tug-of-war?
It can be very great. In one sad incident in India years ago, a mass tug 'o war with two thousand men snapped a 2 inch nylon cable. The broken ends flew back like a giant whip, tearing off fingers and inflicting other injuries.Every rope is rated in breaking strength and safe working load, which is typically10-15% of the breaking strength. (It depends on the rope material). In countries using the American System, this is expressed in pounds; in those on the Metric System, in either kilograms or newtons.
Which is stronger a long rope or short rope?
Technically it doesn't matter. The length of a rope has no impact upon its breaking point and its strength. How the rope is anchored and any knots used is most important and usually will be responsible for the breaking point.
How do you calculate safe working load of a ship's bollard?
SWL = Ultimate (Breaking) Strength/Design (Safety) Factor Usually the safety factor used in lifting equipment is 5:1. Example: If you are using a 0.5" Improved Plow Wire Rope the ultimate strength is 11.5 tons. SWL = 11.5/5 = 2.3 tons The safety factor should go higher if there is possibility of injury or death. Example: Elevators use a 20:1 safety factor.
What is tensile load?
Think of a tensile load as a "pulling" force. A tensile load is the only type of load that can be taken by a rope, for instance.
Where is the load arm on a pulley?
The load arm is the radius of the pulley. This is the distance from the fulcrum to the load-carrying side of the rope.
What will be the breaking strength of wire rope sling if SWL of wire rope sling 8T and factor of safety is 5?
1.6 ton The answer would be 40T, 1.6T is the WLL or SWL of an 8T nominal breaking strength rope.
If you suspend a load from a fixed support by means of a rope what downward force acts on the load?
Gravity
Does a winch with more rope lift a load with least effort?
NO
