your video was very helpful, easy to understand, and well put. Thanks,

This is my favorite video on how to figure this out. Years later, I'm back to this no-frills explanation. Excellent.

Considering the Safety Factor is built into the rigging, this is a fantastic demonstration.

thanks for posting this, i truly understood now

For learner or safety personnel it's v informative...Thank sir.

Thank you. This helped.

Thank you. Easy to understand

Excellent way of explaining Love ❤

thank you for your work

Thank you..very clear explanation🌷

Great info - thanks!

Noted ..helped me with my elevator home work . Thank you

Thank u so much for your excellent way of explain for easy understand.

Thank You , very good information .

thanks for your information

Thank your video,really helped me

Thanks for video its make me easier to tell

I like the way you talk slightly slow sir. It provides me time to take notes 👍 thanks

I work construction rigging etc and this is basic thanks teacher you explained it a lot easier than how I learned it on the field lol

@LookOutForNumberOne

Жыл бұрын

But he is WRONG. I have proved mathematically in my other comment.

This vide is very helpful

Thanks for the clear tutorial. Sub'd to your channel as a result👍🏽

Thank you sir. Thank you very much

Thanks

Thank you sir 🤝

Thank you sir

good idea

How can I calculate the breaking strength/force.And how will I calculate or determine if the sling is correct one to use with calculations.

It's really nice video... Because, this video is more helpful for me... Special thanks a lot... ❤️

Nice vide

Do you have the problems that deal with figuring out the valume and weight of tanks, steel pipes beams etc....cant find anything the can help me me on steel pipes for the ncccco test

awesome- thanks

Hello I appreciate so much this video and can you please add one video for how to pass the interview for crane operator? thank you so muck for anyone who upload.

Plz make a video about centre of gravity of a weight.

Sir plz make video on 3 leg and 4 leg tension calculation formula

hi. thank you for tha video. please could you explain me, when we do these calculations ? because how can we know the distance between hook point and load....

@taylorstroud6426

4 жыл бұрын

Gabil Gurbanov tape measure

@LookOutForNumberOne

Жыл бұрын

There is a formula to determine the HH (Hook Height) The person in the video is doing in another way, still valid but he is missing the HH calculations.

Awesome

Good job cousin

Dustin Outlaw, Theknotman1964 is from the UK. When he talks about not going beyond 90 degrees, he means 90 degrees at the hook which translates into 45 degrees from the horizontal.

@mickeymaynor1888

5 жыл бұрын

Tom mMarley

Grate information, i would like to learn to calculate the load chart of a boom truck40 ton and under with a series 456b with a 18ft jib. ( the gross capacity, net capacity,what does they represent or mean. ) looking forward for another grate class one love thank you.

@dustinjones4910

4 жыл бұрын

Look at the load chart of the of the crane. It'll tell you the capacity at the radius of the boom, jib, trolley etc depending on company your with, a lift plan will be needed past a certain crane chart capacity...

@LordOfThunderUK

10 ай бұрын

@@dustinjones4910 This tells me that he works alone in his lorry, no operator should be necessarily forced to know this information. There are qualified personnel that make these evaluations and the information is then relayed to the crane operator via a liftplan.

Good

Apply resolution of forces..Tension on each sling = 6000 /Sine theta = 6000 /(4/6) = 9000 lbs

How do you calculate the sling loads in a four point system which is asymmetrical i.e. the COG is away from the centre of the object? Please provide solutions for this if you have. Thank you

@dontetidwell4867

4 жыл бұрын

Only 2 legs carry the load!

If 4 sling is divided by 4?

please I need more informaitn about Riggers safety and calculate

I start my apprenticeship with cranes tmr, and have a question, the straps vertical safe working load at 90Deg is 6000K . but on the diagram you draw the straps at 45 Deg. angles. from the hook. does that pose a problem ?

@dustinoutlaw2414

7 жыл бұрын

He's telling you towards the end of the video what the stress will be on each leg... Just remember at 30 degrees on a 2 leg lift, if the load weighs 2k then each leg, at 30 degrees will each have 2k lbs on it.

Tq

So if you use 3 strings instead of 2 to lift the weight it is X times 1/3 of the weight. Or am I reading this wrong?

@davidwoodward4431

6 жыл бұрын

no. when you do this calculation it's always based on 2 legs.

@michaelboyer4474

6 жыл бұрын

Sardar Vlogs the third and forth leg are for balance of the load 2 slings have to be able to carry the load by there self. Just like using a 4 leg bridle, 2 of the 4 legs must be able to support the weight.

@Kumileimasin

5 жыл бұрын

Michael Boyer, nope, when you're lifting with 4 slings, you can calculate strength of your lift with 3 slings, not with 2

@jaybloggs8699

3 жыл бұрын

@@michaelboyer4474 2 "diagonally opposed" legs...

Estou a tirar o curso e o professor pede para assistir esse vídeo, não percebo inglês e não há legendas

I want to know how to convert this method of reference to metric? Or worse. Where do the number compound to the point that this method is not set in stone. Feet divide into twelve equal parts. Pounds divide into sixteen. Like celcius and Fahrenheit? Only works at -40°. Probably be close for a quick check though. Nice.

How come you dont compare the 9000 lb answer at SWL 45 degree angle.? Are all angle loads compared to 90 degree SWL?

@dustinjones4910

4 жыл бұрын

In this case. You take the length of your choker and the height to the hook from center... (Basically gives you the angle) then multiply half the load weight. Gives you the tension on the choker... You don't have to know the angle for this formula... Just look at your tag for load limits in a choke, straight, or basket and you'll be good to go... Assuming center of gravity is center of what you're lifting

An increase in the calculated load

Safety is our top priority..

These are the basic principles of rigging operation safetly.

This is part of the test when your doing your Sparrows Stage 2 Certificate in the UK So thanks for posting it As for Dragonf1sh below you need to go back to training school if you want to forget about the Angles because the bigger the angle the more weight is on the strop But 90 deg is the safest angle and i would never go beyond it

@dustinoutlaw2414

7 жыл бұрын

Never exceed 90 degrees? You're gonna put a hurting on your company with all of those spreader bars...

The step #2, isn't it supposed to be X times N (number of slings) times W instead? And, how about a 3-dimensional beams, the case with slings with different x-y-z coordinates, can we calculate it the same way?

@georgefdo825

4 жыл бұрын

Are you rigger i want some doubt i want learn possible you teach me

It's stupid to forget about the angle! An object lifted by 2 straps with an angle smaller than 30 degrees woulds require straps with more SWL than the weight of the object. In other words: if the angle is smaller than 30 degrees with 2 straps it is saver to use only one strap.

@Ranveer_Singh_Kahani

Жыл бұрын

How

How to get height between hook and load?

Please make video, how to calculate load with using block(s)

Sir i dont know how to calculate "H" please help.

@natemay6892

3 жыл бұрын

Pythagorean theory my friend A2+b2=c2 If you’re missing b, subtract a from c Then use your square root button on calculator on the end sum for b Same if you’re missing a Subtract b from c and you’ll have a

simply calculate 1.4 X single leg swl gives 2leg swl 2.1 X single leg swl gives 3 and 4 Leg swl

@antonygilbey7987

5 жыл бұрын

Thats all I ever use 1.4 and 2.1 lot easier than this and confusing to people that dont work with cranes at all.

@jackosullivan2949

4 жыл бұрын

Antony Gilbey 👍🏻😎

and using 4 legs slings?

@squirts1

4 жыл бұрын

divide by 4 instead of 2 basically.

tanxx

By the time you figure that out I'll have it lifted already

@RahubaatNeteru

6 жыл бұрын

Pedro Adriano lol exactly.

@jamalford961

5 жыл бұрын

Its more bout the science and math behind it. We all know the load can be lifted but how do we explain the possibility of it. U know 75/5=15, but how do you explain it and prove it. Always thought this was funny in construction.

@hbradar1

5 жыл бұрын

My old boss did what you are talking about, ( shooting from the hip ). Sling at 80 degrees, load 850 lbs ( 385 Kg ), no chafing gear , STRAP PARTED just before destination. DO YOUR HOMEWORK .

@dennisddiamond854

5 жыл бұрын

Yeah, that's a great idea if you survive the drop...........

@LookOutForNumberOne

Жыл бұрын

That may be the case, but it would be a Cowboy lift. Totally irresponsible. The lift plan is done before you do the lift and generally by a more qualified person than you. So you can lift safely.

if the horizontal angle of ur sling is 60 degree....then we should multiply 9000 with 1.155( loade angle facto for 60 degree). the answer would be bigger than SWL OF WEBSLING IN verticle position.am I right or not?

@johnnyhaiku8521

5 жыл бұрын

agreed! but great video

@squirts1

4 жыл бұрын

that calculation was already made, he just used a different method to get there.

How to get the sling height

@andrews9547

6 жыл бұрын

Tape measure.

@awsmustafa4895

6 жыл бұрын

or presumption

How you know weight is 12000?

@jason95449

5 жыл бұрын

Examples

Sr. Why do you ad 1000 lb to 9000 lb. Thanks. To work in x,y,z plane I have to vectorize the forze on each componentes, and if I require a dinamic movemen i have to consider the graivity force. Isn´t it? And Thanks for all.

@squirts1

4 жыл бұрын

he did not add 1000 lbs... the 10,000lb number is the example safe working load limit of the sling legs. The force applied by the load in his example is 9,000lbs per leg. thus, the load is safe.

This is not a 90°lift, right?

Can't you just multiply by the sine of the angle? Say a vertical sling is considered to be at 90º and you have two slings at 30º and each sling has a SWL of 1000lbs; you would calculate the sine of 30 (0.5) and multiply it by the SWL, giving you a SWL of 500lbs per sling. Is this accurate?

@1cy3

9 жыл бұрын

It's accurate but useless unless if you don't know the angle. In this video he does not assume you know the angle.

@ElectricityTaster

9 жыл бұрын

1cy3 But can't the angle be easily measured?

@antonygilbey7987

5 жыл бұрын

You can do it with one sling , 1.4 times the SWL of one sling gives you the answer for 1to 2 slings for 3 to 4 slings use 2.1 thats what most of us riggers will do.

1. Please don't call them "straps". What you show in the video is a "Web Sling". 2. The Load Angle Factor (LAF) can be calculated by this method from any point on the sling, not necessarily all the way to the hook, (which would be difficult with a very long sling. 3. For practical purposes the rigger should remember the 3 main angles he is concerned with a. 60 degrees is preferred, 1.155 b. 45 degrees is next option, 1.414 and the low limit when going into a hook, and c. 30 degrees which is worst case 2.0 and the low limit going into a shackle or master link.. And for James Kutty Joseph, please do not rig any load until you understand the stress factor. Try holding a 5 gal bucket of water straight down, then at a 45 degree angle and see if your arm feels any additional stress at 45 degrees.

@squirts1

4 жыл бұрын

holding a weight at angles with your arm operates under COMPLETELY different principles. Please do not try to correct people with incorrect analogies... The vernacular difference between straps or web slings is effectively irrelevant. Not to mention the fact that it could be chains, ropes, wire rope (steel cable), etc...

@PedroSanchez-uj8st

4 жыл бұрын

That's an endless not a web sling

@GOLDVIOLINbowofdeath

2 жыл бұрын

@@squirts1 Yes, your arms are not ropes that can only resist pure tension and your joints are not pin connections that can’t resist any torsion.

@LordOfThunderUK

10 ай бұрын

@@squirts1 There are a couple of issues here, first, that weight is almost 5.5 tonnes, so the webbing sling would NOT be adequate for the lift, Chains would be the preferred method. Another issue is that that sling had miss information, because 90 degrees, is talking about included angle and therefore Uniform Load Method calculation should be applied. Handwritten information on the sling tag is doggy to say the least. I get it that the video is 14 years old, and now we have better methods to get a correct calculation. BTW, Gary was right. His analogy stands because it reflects the extra work the arm has to endure to maintain the angle.

@squirts1

10 ай бұрын

@@LordOfThunderUKThere are no issues with my comment at all. His analogy is completely incorrect and conflates 2 very different principles. Torque vs tension. While it is more difficult to hold an object at arms length or at an angle, that is a completely different mechanism than suspending an object between two or multiple points. The application of force vectors is very different. In his analogy, the biggest factor is reducing the length of the arms to reduce torque or load on the joint. While reducing the length of a sling leg (and keeping the same angles) would have zero impact on the forces. As far as the type of sling used... There absolutely are web/strap slings rated for and capable of holding that load. Although, didn't say anything about the type or rating of sling. It's an irrelevant comment in which you try to imply "problems" with my reply.

I am an Appointed Person, trained to make lift plans. The only thing good about this video is that you can find out the "sling load" but this should NOT be used to calculate the actual lift, because it is WRONG. A Load Weight of 12,000 lbs is, 5443 kg so, 5.45 Tonnes. This is very heavy to be using “slings” or better called Webbing Slings. You will be using a sling that it is too wide and may need shackles to attach to the lifting points of the load, making it unreasonable. Red Lifting Slings are for up to 5 tonnes, Brown Lifting Slings up to 6 tonnes, but these are rated for vertical lifts, angled loads require a much higher vertical rating. Instead, chains should be used in this example. An 8t rated chain can do the job safely. Calculating the Safe Working Load (SWL) - i.e. Rated Capacity - of multi-leg sling/lifting accessory arrangements using Uniform Load Method. The measurement of the HH (hook height) is a bit ambiguous to say the least. The correct way of calculating the HH is based on the desired (included angle, in the UK, is 90 degrees or lower) Or up to 45 degrees on the vertical angle from the load point (vertical) to the angle to the hook of the crane. The most important factor is the desired angle of the chains in relation to the hooking points of the load, which is called (included angle). In this example, I used my Trigonometry Calculator App and I input the known values that this person in this video gave. We know that the right angle from the HH to the base of the centre of the load is 4ft which is (a) side. We know the hypotenuse (c) 6ft, with this information we can now know the angles and (b) distance, which is half of the distance of the load. So, side b is 4.472 ft (1.36 m) x 2 = 8.94 ft (2.72 m) is the total length of the load. The angle beta, which is the angle between the vertical side of the HH and the distance of the sling is 48,18 degrees, making the included angle of 96.35 degrees. I will refuse or not allow this lift given these characteristics because we don't know the sling tension for an included angle greater than 90 degrees. Making numbers out is not the professional way to teach lifting operations.

THANKS ... I thought it will actually reduce force when it is at an angle ..still i am not convinced , the resultant force should be the wt of the load , and the sling would divide the total wt of the load in to half ... sharing ... where this extra tension comes from ? since there is no horizontal component in a vertical load!!!!

@Skrimtar82

9 жыл бұрын

90 degrees is verticle and that's the rating for the sling. You go off center and the weight dynamic is different

@jkj1459

9 жыл бұрын

ok thank you ,

@alexpeters

9 жыл бұрын

james kutty Joseph The extra tension comes from the effect of horizontal load that comes from the slings not lifting vertically (90degrees). If the angle is 60degrees the sling is pulling sideways on the anchor and vertically. A 170degree angle could put as much as 1153% of the total sling load weight on each anchor. Try holding a 30lb weight straight above your head, then try holding it straight out in front of you or straight out sideways.

@lucashoward2270

8 жыл бұрын

+james kutty Joseph the best way to understand this is to hang from an object with both of your arms straight up at first, then with your arms spread as far apart as you can reach. You will feel more strain with your arms spread.

@jkj1459

8 жыл бұрын

Lucas Howard GOOD EXAMPLE...THOUGH

So rigging is liiiike a box of chocolates?

Ok.... So not confuse anybody when you do the calculations for foce of each sling, and compair it to the safety rating on the sling (weight) I and it falls short, of safety for a single sling,...... But you are using 4 slings instead of the single so u got the single sling rating ×4 will that be considered a proper and safe lift ...........🤔

I really want to know all of you... Q:what is the meaning of injection molding machine clamping tonnage 1600KN?? plz give ans and calculation. help me

@antonygilbey7987

5 жыл бұрын

KN is newtons 10 kn = 1000kg they now put this on all ratchet straps for securing loads !

Not understand last point.

you did not calculate the sling angle inorder to determine the exact force on each leg, and that my friend is a deadly mistake.

@squirts1

4 жыл бұрын

yes he did... his example is using 2 sling legs.

#accesstoenergy

Each SWL of your slings should be at least equal to or more than the full load at 90 degs...................forget working out the angle!!

@dustinoutlaw2414

7 жыл бұрын

That's a lazy ass comment. Ignorant as well. Take all of the thought out of it? Jesus...

@antonygilbey7987

5 жыл бұрын

Correct then just use 1.4 and 2.1 method on one sling

I dont understand

wrong computation

I really want to say u unstand whatyou said

Presentation is very slow and poor

geeesh can you talk any slower and dry

@dennisddiamond854

5 жыл бұрын

Geesh, did you want the Avengers theme playing in the background? Maybe that would make it more exciting?? This stuff is brain dead easy stuff anyway but most wanna be operators have to have it broken down to the lowest and slowest in order to understand.

Thanks