the mystery of the "strange" vines

[cesius79]

I didn't say it was...

If things are so then I absolutely do not understand how to place the screws...something does not come back!

On the contrary, no.senti this...the compasses are threaded into the fglangia (as you do with flanges and tubes in hydraulic applications) and welded with corner cord... at this point the structure is monolithic, there is no problem you indicated and the layout serves for the proper alignment to the assembly.

 

[cesius79]

If things are so then I absolutely do not understand how to place the screws...something does not come back!

On the contrary, no.senti this...the compasses are threaded into the fglangia (as you do with flanges and tubes in hydraulic applications) and welded with corner cord... at this point the structure is monolithic, there is no problem you indicated and the layout serves for the proper alignment to the assembly.

They don't sound. This is a real weirdo.

 

[Nicola De Stefano]

Hello, I've just been inscribed.

reading the discussion I read about a treatment of deidrogenazine, I wanted to know if anyone can give me more detailed information about this process.
I knew the existence of this treatment for the screws but now, I needed to understand something more since I have to apply this treatment to curves drawn into aisi....to avoid the break after welding... .


Thank you!

 

[Er Presidente]

is a heat treatment, in the oven at about 200°c and then slow cooling.
If you are looking for iso 2081 you should find all the details.

 

[Exatem]

with regard to the "strange screws" of the photo, since except the president no one took into account the possibility that the hardware had only partially threaded screws :biggrin:, I found the following:"The attached bolt-elements set is an elastic set whose stiffness depends on the stiffness of both components. in particular the rigidity of the elements depends on the width of the zone affected by compression and from the connection heightCut
in the threaded connections it is necessary to have:High connection heightspace around the appropriate bolt
adequate bolt support surface
eccentricity of the load action line compared to the symmetry axis of the limited link...."Cut.
all accompanied by drawings (including a connection of a biella with its foot made with "distantial" on the type of the photo), that I cannot attach you as I discarded the scanner, but that there are, trust me.
Will it be?

 

[Nicola De Stefano]

Grazie![/QUOTE]

 

[myface]

As regards the answer to the first question (because there are spacers) it is unleashed: as was said vine+long=less concentrations of stress.

It would remain curiosity about the curious alternating arrangement:
1 solution- perhaps simply the worker underpaid in black had asked for clarifications to the judiciary, receiving dubious answer: here is then these that, with the support of a couple of beers, disguising in if , he mounted them alternating, giving also free vent to his never fully expressed artistic vein.
solution 2- the judiciary had entrusted the work to two subjects as above that after furious quarrel on the position of the spacers sign ( sealing it with the two famous beers) the harmony: tones mount them from above and bees mount them from below.
solution 3- there's a hurry, the sagra begins the evening itself and the ride has not yet been mounted. Romi has already set the lock of half prisoners when, however, caught by the thirst decides for a fresh beer... Two.

back when the crane has already discharged the base, which in the transport traveled legs up. after some blasphemy of settlement then continues with the remaining prisoners, always putting the space from above, to make less effort.

p.s. the names are fancy! :biggrin:

 

[davide75]

solution 4 - there are beams that can be mounted from other parts using the same holes

 

[Exatem]

"I have... seeing things that you humans cannot imagine. . .

Fighting ships in flames off the bay ramparts. . .
and I saw the rays b whale in the dark near the gates of tannhäuser.. . .
and all those moments will be lost in time.. .
Like tears... in the rain...


It's time to die.... »

 

[vale61]

If that's good?

While turning around the net trying to understand the tightening pairs of the screws between different materials (e.g. steel screw - aluminium screws) I found these slides of the polytechnic of torino and I think that on page 13 tav. 25 there is an explanation of the advantage of having long screws, as well as already ' anticipated by other forumists.

http://corsiadistanza.polito.it/corsi/pdf/04asbp/ecm_8_collegamenti_filettati.pdf

ciao vale.

 

[Er Presidente]

If that's good?

While turning around the net trying to understand the tightening pairs of the screws between different materials (e.g. steel screw - aluminium screws) I found these slides of the polytechnic of torino and I think that on page 13 tav. 25 there is an explanation of the advantage of having long screws, as well as already ' anticipated by other forumists.

http://corsiadistanza.polito.it/corsi/pdf/04asbp/ecm_8_collegamenti_filettati.pdf

ciao vale.

Where's the "I like" button?
:smile:

 

[re_solidworks]

I looked at the pdf and it's very interesting. I'll look better calmly, now I have to work.. . .
have you noticed how they recommend placing the contradado on the last page? I have always seen the opposite in everyday practice.
What do you say?

 

[vale61]

... since we are in threads and screws ... for the purpose, there is no prorpio anything of "tabellato" that gives me references for tracing the torque in case of screws/magnets of different materials?

obvious that the rule that splits the screw but not the thread is valid only for equal materials (or almost) between screws/magnets but does there exist some "reduction factor" in the case of different materials?

from what little I have seen on the net and for some standards defined by some foreign multinational it seems that for example stainless screw (a2) to aluminum (from fusion) recommends a 40% reduction factor approximately.

But if there were any unified tables or I would almost be in place even from the point of view "technical documentation" of reference.

Bye-bye.

 

[desMoira]

I think that a mounting of this type with spacers on both sides is more resistant to alternating fatigue stresses: the spacer itself is a structural element that always works in compression, or better work in compression those mounted on the opposite side to the direction of stress alternating then with those on the other side to the reverse of stress.

 

[Fulvio Romano]

I think that a mounting of this type with spacers on both sides is more resistant to alternating fatigue stresses: the spacer itself is a structural element that always works in compression, or better work in compression those mounted on the opposite side to the direction of stress alternating then with those on the other side to the reverse of stress.

What?
Why should those up and down react differently to stresses? I miss something...

 

[Er Presidente]

they probably want to avoid that defects of complanity on the sides of support of the tests/dades go to solicit all the screws in the same way. If the "stored" support face is on the side of the spacer the stem is less stressed.

 

[GiGa]

I looked at the pdf and it's very interesting. I'll look better calmly, now I have to work.. . .
have you noticed how they recommend placing the contradado on the last page? I have always seen the opposite in everyday practice.
What do you say?

I quote everything... very interesting, including the part of the "inverted" counterdado. . .
I will also study it to understand why on page 13 put a screw completely threaded with the spacer instead of a partially threaded (immagin is only to check the case "dream"). . .

 

[Exatem]

What?
Why should those up and down react differently to stresses? I miss something...

because probably desmoire hypotheses the following condition. the two elements are connected with two flange attacks to and b. if the stress, which she assumed alternating, is of traction, that is to tend to get away from b, all the spacers placed on the face b are compressed while the corresponding on to are discharges. On the contrary, if the stress is compression, the opposite condition occurs.
I think he wanted to play it that way.

 

[sampom]

because probably desmoire hypotheses the following condition. the two elements are connected with two flange attacks to and b. if the stress, which she assumed alternating, is of traction, that is to tend to get away from b, all the spacers placed on the face b are compressed while the corresponding on to are discharges. On the contrary, if the stress is compression, the opposite condition occurs.
I think he wanted to play it that way.

..uhmmm.
I would say that under traction the spacers are always compressed, both above and below (the screws with heads and dice always keep them compressed to its flange).
alternating in compression all the spacers (and therefore the screws) are discharged and the stress remains only between the flanges.
in practice screws and spacers (over and below) always work the same way, when alternating it does for everyone.. or all compressed or all downloads.. I can't believe

greetings
Marco:smile:

 

[Exatem]

As regards the presence of spacers, it seems to me that it is now clear:

with regard to the "strange screws" of the photo, since except the president no one took into account the possibility that the hardware had only partially threaded screws :biggrin:, I found the following:"The attached bolt-elements set is an elastic set whose stiffness depends on the stiffness of both components. in particular the rigidity of the elements depends on the width of the zone affected by compression and from the connection heightCut
in the threaded connections it is necessary to have:High connection heightspace around the appropriate bolt
adequate bolt support surface
eccentricity of the load action line compared to the symmetry axis of the limited link...."Cut.
all accompanied by drawings (including a connection of a biella with its foot made with "distantial" on the type of the photo), that I cannot attach you as I discarded the scanner, but that there are, trust me.
Will it be?

If that's good?

While turning around the net trying to understand the tightening pairs of the screws between different materials (e.g. steel screw - aluminium screws) I found these slides of the polytechnic of torino and I think that on page 13 tav. 25 there is an explanation of the advantage of having long screws, as well as already ' anticipated by other forumists.

http://corsiadistanza.polito.it/corsi/pdf/04asbp/ecm_8_collegamenti_filettati.pdf

ciao vale.

for alternating above/under instead, it continues to brancular. . .

..uhmmm.
I would say that under traction the spacers are always compressed, both above and below (the screws with heads and dice always keep them compressed to its flange).
alternating in compression all the spacers (and therefore the screws) are discharged and the stress remains only between the flanges.
in practice screws and spacers (over and below) always work the same way, when alternating it does for everyone.. or all compressed or all downloads.. I can't believe

greetings
Marco:smile:

In fact, the fact that the bolts are preloaded should put in the same conditions all spacers.... even if it does not seem to me that in compression the screws are scarce given the presence of spacers... Indeed, perhaps this is their function. always keep the screws in the same conditions, whatever the load condition.
But the doubt remains...