How Do I Make a Load Chart for Telescopic Crane

Not sure what you need, this is basic...

http://www.skyazul.com/english/resources/What%20is%20Load%20Moment.pdf

my primary boom length would be of 120cm and secondary boom length is 80cm. i need to know at what boom length and at what boom angle i would be having maximum load capacity of 40kg.

0° and 2m this comes out if you make the intellectual effort to read and may be to understand what you were given as hint.

I am amazed that you want to do a project without trying first to understand what you want to do.

This is the load capacity with the boom vertically positioned. When extending the boom, you will need:

-to know how the weight of the telescopes evolve away from this point.

-recalculate your stability, related to the moment you create, always from your start point. (center vertically)

-wind loads, specially for long booms.

To give you an idea: with 60 feet horizontally extended boom a 18 ton crane has not a lot left, somewhat between 850- and 1000 kg, depending how the outriggers are calculated and the weight of the crane.

These determine the kipp moment. This also changes a little bit between the legs, since your base isn't a circle.

That should only take a few moments....

Start with some sketches

Analyse the extremeties of operation to establish boundaries.

Fill in the bits in between

Plot.

Hint: You will have to read a bit and do some math.

Final year project? Maybe review what you should have learned from the first year! Good luck! Another outstanding crop of new "engineers" ready to graduate.

Final year project in what discipline? Presumably it is engineering and not model-making. If it is engineering and you are in your final year, then you should have the ability to identify the necessary design elements and perform the calculations related to them.

To reiterate my answer to a previous poster with a question regarding his final year project, I ask you to whom you will turn for help when you have secured an employment position in your chosen field? Will you then share your salary in that instance? Perhaps you should chose the model-making field and then you can simply copy the work that someone who is properly educated, and who has applied himself to that education, has done and you won't have to be bothered with those pesky calculations.

I assume that it is a mobile crane you are considering.

You have two balancing moments namely the counter moment which is the weight of the crane multiplied by the distance of the center of gravity to the point of contact on the ground, whether that be a wheel or an outrigger, and the other is the load moment which is the weight of the load multiplied by the center of gravity distance to the point of contact. Obviously the former moment must be the bigger.

All you now have to do is calculate the maximum distance of the load for each position of the boom without exceeding the counter moment.

Johan.

For a final year project it might be required to take into consideration that the boom fulcrum is not coincident with the slewing center, that the force is applied to a slewing bearing that may be of significant diameter (in a real situation) and that the center of gravity may be located well behind the slewing center.