theoretical calculation of the radius of a curve of a component

[Elet88]

Hello everyone,
I hope to post this question in the right section.

I have always followed the world of cad with passion and it seems that it can finally turn everything into a profession. for this I am informing myself about every manual at my disposal. but I am forced to intervene with a post because I need your help from expert designers on a topic that if you have to see it with the theory before going to the cad program.

Let's imagine that I am required to draw a simple 100 mm long pipe in cad, which was folded exactly in half (i.e. 50 mm) with a 90° angle. I have all these data and I can draw this pipe in cad without thoughts, but if it were put in my hand this tube of which I I don't know, how can I find exactly its bending radius and calculate exactly its length to prepare a design in which specific angle and bending point? what procedures and tools should I use? (because the eye fold might look 90°, but actually be 85° or 95°).

and said this, how can you perform these calculations on much more complex pieces (such as a crane load hook, which at least will have ten different rays)?

thanks in advance,
Marco:finger:

 

[MassiVonWeizen]

You simply cannot draw something that ignores the constructive data.
when drawings you give the data to the program, data you need to know and what hypothetically accurate drawings. if you need a radius of 47.6 drawings with that value and if the fold is 88,37° that must be in the drawing. in the workshop they will do it from 90° to the eye that so much serves to download oil.
as no element is fine to itself the data revenues from the context in which it is inserted or from the calculations that result in the design.

 

[Elet88]

Thank you for your answer, perhaps obvious, but not entirely discounted
so no one can ever give me the hook of a crane and tell me: "Take out all the precise measures of the various beams of the fold forming the hook", but at the most you can give me general measures, and then you will see together whether to change or not the draft design that I will make.

 

[MassiVonWeizen]

the hook of a crane I have no idea how it is designed, if the shape responds to precise parameters resulting from calculations and structural analysis.
I don't understand your question. .
- if you have to design it you have the basic knowledge to develop the design of a hook and then you also know how to draw it
- if you need to detect it from a hook in the workshop you don't do it with any manual tool, at most stick it on a sheet of paper and rip the shape, the scan and import it into a cad to repass it with curves and lines
- if they already give it to you and you have to quote it you just have to put the quotas of the various entities.

 

[Elet88]

I'm sorry, Mass, I thought I was a good expression.
My question finds answer in point 2, i.e. the possibility to re-pass the shape on a sheet and then scan it. I had already thought about this but I didn't know if there were more methods... how to say... conventional

Thank you!

 

[MassiVonWeizen]

with tactor or optical scanner but it's a topic I know little about.
However, with a precise backdrop, you will have little. but a crane hook if instead of a 100 point radius has it from 120 changes very little. I also think it is wrong to talk about rays because it should be an evolving curve.

 

[Elet88]

Thank you