trave np o ipe

[Guido]

hello to all and good 2011,

I have to make 2 large workshop stands to support us over heavy mechanical parts.

the choice, for rapid construction, is relapsed on the use of commercial beams, for horizontal elements, of the type ipe.

However, by observing the prontuary of the beams I was doubtful whether to use ipe beams or np.

apart from the "light" difference in geometric form, can you tell me what to choose a beam from the other??

Thank you!
guide

 

[stefanobruno]

What makes you choose a beam compared to the other??

the bending resistance module w, the weight to the mt, the spaces you have available and the ease of composition of the frame ( + what you possibly have available in the workshop :biggrin: ) with an order of importance that you establish.
looking only at the height of the iron the ipe is better than the np, weighs less, more salts of size and more increases the advantage.
on the other hand it is less easy to make crossroads of the various knots, but this is dependent on what you have to do.

Bye.

before answering you I took in hand the " manual of mechanics " hoepli and I caught a nice error in the page of the upn ferries uni 5786 and 5680 (page h-109 ) where they reversed the mass with the quota d.

 

[Guido]

Thanks for the answer.

I would like to stand on a h = 300 . yes the ipe weighs less but comparing the maximum permitted loads the np beam is higher.

I need the beam that is less inflected (hypotized leaning to the extremes) at equal height but for concentrated load towards the center and not evenly distributed as indicated in the technical sheet....so ipe or np ?

Thank you.
guide

 

[Fulvio Romano]

if you care that you flet less, it is not important that the load be distributed or concentrated. the parameter of "resistance" to the bending is always the same, that is the moment of inertia i, or the module of resistance w (which then is equal to i/y). So the biggest one wins.
the np beams have the wings a little thicker, therefore they resist more to bending, but they weigh more. I don't have the technical cards under my hand, but I don't think the differences are then exorbitant. If I had to dimension the structure I would choose without doubt the beam that the workshop has already in stock. which is then one of the parameters proposed by stefanobruno

 

[JUMPY_75]

If you are interested in my opinion choose an ipe profile as the ipn profile is increasingly "accepted" by the suppliers of iron and steel products and therefore risk hearing you say that they cannot provide you with the requested profile or risk of getting a price/kilo salty.

 

[Guido]

Okay, thanks for the comments.

However, as an ipe wing or ipn must be milled to bring it to the floor, the ipe has little material than the ipn. choosing the ipe I should probably add/soak a dish and then fresare....for this reason the ipn may do to my case also because I have to recover 2 beams from 6 meters only, not to make a palace :smile:

guide

 

[stefanobruno]

as an ipe wing or ipn will have to be milled to take it to the floor....

a comparative advice between the two profiles can also give it blindly.
when we go specifically to your project, without seeing anything you want to do, how can we give you further assistance?
If you do a stand that only supports the piece, it is important that you hold the load safely,
If you say you have to work the wing I assume you have some extra precision needs, it will not only be a support to paint the piece.
How big and heavy is the piece?

 

[Exatem]

a comparative advice between the two profiles can also give it blindly.
when we go specifically to your project, without seeing anything you want to do, how can we give you further assistance?
If you do a stand that only supports the piece, it is important that you hold the load safely,
If you say you have to work the wing I assume you have some extra precision needs, it will not only be a support to paint the piece.
How big and heavy is the piece?

I agree with stefanobruno for what he said. if you have to fresare a wing you need special needs.
You want to talk to us?

 

[Guido]

nothing special. when we build something, even a simple easel, we cut all the couplings. as the structure will not be welded but bolted, all interfaces will be milled. here the consideration of the poor "kick" of the Ipe.

guide

 

[Likesteel]

fresare le ali?

 

[stefanobruno]

when we build something, even a simple easel, we cut all couplings

They are chosen, huh?

 

[Fulvio Romano]

Forgive me for ignorance, but since the bolted couplings need surface preparation? less than large surfaces and starting from very rough materials.

 

[numero1]

no, it is not about surface preparation, if I have understood well to fresare the wings is the cut of the upper and lower part of the beam 1 (the wings), in this way his soul will be set in a perfect way in the beam 2, the one that welcomes it.
in practice between wing and wing.
which (trave 2) will have welded a handkerchief (or team) near the soul of the beam 1 and then you will have a fastening by piercing the soul of the beam 1.
I have written by dogs I know, but I think I have understood that it is so:biggrin:
If you can understand what I wrote you are great.:finger:
Hi.

 

[Fulvio Romano]

no, it is not about surface preparation, if I have understood well to fresare the wings is the cut of the upper and lower part of the beam 1 (the wings), in this way his soul will be set in a perfect way in the beam 2, the one that welcomes it.
in practice between wing and wing.
which (trave 2) will have welded a handkerchief (or team) near the soul of the beam 1 and then you will have a fastening by piercing the soul of the beam 1.
I have written by dogs I know, but I think I have understood that it is so:biggrin:
If you can understand what I wrote you are great.:finger:
Hi.

I'm a magician, and I figured out what you wrote...:finger:
If so, okay, it's right, but more than fresare I would have given us more fluffy cannello than cleaning.. .

 

[Exatem]

no, it is not about surface preparation, if I have understood well to fresare the wings is the cut of the upper and lower part of the beam 1 (the wings), in this way his soul will be set in a perfect way in the beam 2, the one that welcomes it.
in practice between wing and wing.
which (trave 2) will have welded a handkerchief (or team) near the soul of the beam 1 and then you will have a fastening by piercing the soul of the beam 1.
I have written by dogs I know, but I think I have understood that it is so:biggrin:
If you can understand what I wrote you are great.:finger:
Hi.

But you mean something like that?

 

[michele81]

I'm a magician, and I figured out what you wrote...:finger:
If so, okay, it's right, but more than fresare I would have given us more fluffy cannello than cleaning.. .

If you want to do the exact, you can use a laser sohttp://www.mazaklaser.it/web/products/3d-fabri-gear.aspx/itWe just bought a... absolutely spectacular one. :wink:
maybe it's an exaggerated expense to make 4 pieces...:tongue:

 

[numero1]

But you mean something like that?

not really, you used angles for bolting, and this goes well if you want a completely removable structure, I talked about welded tissues is a little different.
but above all we miss, in your design a line, see attached.
Hi.

 

[maxopus]

Since the joint is welded to what is the work done on the beam?
I have always seen them cut by saw (or kaltenbach), coupled and welded with the plates.