how to use elastic rosettes

[Fulvio Romano]

The question is, "elastic sheath."
I have always considered it a [blando] antisvitation method if it breaks between the nut and the piece, or between the piece and the head of the screw.

One day I saw a bolt where under the head of the screw there was first a split elastic rosette, then a flat rosette and then the piece to screw. I thought "that imbecile this, in this way turn the washer, the elastic rosette if it could also save".

Since that day I have seen dozens and dozens of buildings with this technique. or under the head of the vine - split rosette - flat rosette - piece 1 - piece 2 - nut.
Things are two:
1. I'm an idiot, so explain to me what caxxo needs something like that.
2. They are imbeciles, and the thread ends here.

Thank you.

 

[Mr.Rio]

where I work is the most used method! I think it is worth the speech of the blando antisvitamento combined with the fact that the holes are sometimes 'comodi' : chesso' holes d.15 on screw m12...the sink grower would fall into the hole or almost. then if the connection is disassembled several times then the piece below would be ruined, instead so replace the grower washer and nut when moving... ideas in freedom, but where I want to avoid the unscrewing I put nut and contradado.
greetings

 

[Fulvio Romano]

Okay, so why not just put the rosette flat?

 

[Mr.Rio]

However, a minimal antisvitation effect gets it. If you try to unscrew a couple with and without growers you will notice that with the grower you get harder.
greetings

 

[MBT]

Let's start with a question... .
How does a bolted connection work?
What do you do so that you get out or, seen on the other side, that you don't get out?

 

[Fulvio Romano]

Let's start with a question... .
How does a bolted connection work?
What do you do so that you get out or, seen on the other side, that you don't get out?

rotation between screw and nut.

 

[MBT]

rotation between screw and nut.

Yeah, okay.
but this is relative.
How to say: what does a bicycle drive? ovvia answer: the cyclist pedaling. correct, but the true indispensable thing is the friction between wheel and asphalt! I can take off the cyclist and put on a motor, I can take off the pedals and put levers, but without friction between wheel and asphalt the bike does not move!

the vine works like a "molla" or less.
I take the two pieces, put them close and put a "molla" (vite) that keeps them united.
Well, the screw spring preloads the piece, generating the friction I need to avoid the two pieces flowing between them.this is the true indispensable element: friction generated by the tightening force!the vine itself is subject to these forces, since its head gets the same force that they exchange the pieces.
similar speech for the bolt, of course.
if this force is sufficiently high, the friction that is generated between the head (of the screw) and piece is sufficient to avoid unscrewing.
This works on paper, now let's see how it works on the iron!
actually there are a couple of things to take into account
first, the surfaces of the pieces affected by the speech. Everything perfectly quiet? all worked as you should? roughness? perpendicularity? no one can guarantee them with high precision, unless they pull up the quality of the processing with costs that become disproportionate.
second, the locking of the screw. the precarious of the vine is the "foreseen" to have the necessary friction? and how do I misjudge this precarious? stick strain gauges on the screw??? ? ?
Third, working conditions. the iron does its job and dilates, deforms, "moves".... I made a perfect coupling at 15°, but the month of August (not this year) I arrived at 45° and the deformations became felt.... if then we talk about machines with operating temperatures of a few hundred degrees.... "mandi vigj" (cit.)

But... There is a need to satisfy these shortcomings. Maybe in an economic way. and if necessary also psychological.
then here are the rosettes, of various type and various form
those planes perform two functions. they adapt to the irregularities of the piece ( pillow case) so that the head of the screw supports correctmethn. Moreover, if they are wide, they can distribute strength on a larger area, reducing pressure on any soft material.
then there are the "sprayed" rosettes, the famous growers. They work in two ways. behave like a kind of additional "mode" to compensate for any expansions of the various components, in addition "dead" the pieces trying to prevent the rough screw and avoid. has the defect to "rovinate" the pieces and create a small trick. for that you will not find them inside the gearboxes, for example
mug rosettes, like schnorr, obviate to the problems of growers. the "molla" effect is more accentuated and friction between the components is emphasized by the zigrinatures.
various schools suggest to use rosettes exclusively as springs, so there are rosettes that are at all effects of mug springs, so smooth.
then... special executions for special cases. then rosettes with foldable fin to lock the nut, for example
or, in extreme cases, dice with crown for coppies, contradades, perforated screws and tied with iron fil. . .
each adopts his techniques according to his assumptions, his experience, his needs. . .

 

[Max-C]

The question is, "elastic sheath."
I have always considered it a [blando] antisvitation method if it breaks between the nut and the piece, or between the piece and the head of the screw.

One day I saw a bolt where under the head of the screw there was first a split elastic rosette, then a flat rosette and then the piece to screw. I thought "that imbecile this, in this way turn the washer, the elastic rosette if it could also save".

Since that day I have seen dozens and dozens of buildings with this technique. or under the head of the vine - split rosette - flat rosette - piece 1 - piece 2 - nut.
Things are two:
1. I'm an idiot, so explain to me what caxxo needs something like that.
2. They are imbeciles, and the thread ends here.

Thank you.

This method is used as the two rosettes (or washers) have different functions.

that split is not to allow unscrewing (due for example to vibrations) i.e. "antisvitation"
that flat to distribute the force of the screw on a greater surface.

the correct way is then screw-> split elastic band-> flat elastic band-> screw->"support"

 

[Fulvio Romano]

second, the locking of the screw. the precarious of the vine is the "foreseen" to have the necessary friction? and how do I misjudge this precarious? stick strain gauges on the screw??? ? ?

Why not!
plarad produces (but I don't find on the internet...) screws with a red bolt on the head, like those of the car batteries. when they are at the correct precarious they become green. If after a little work you find someone red you know what to string and how much...

Did you know?

then there are the "sprayed" rosettes, the famous growers. They work in two ways. behave like a kind of additional "mode" to compensate for any expansions of the various components, in addition "dead" the pieces trying to prevent the rough screw and avoid. has the defect to "rovinate" the pieces and create a small trick. for that you will not find them inside the gearboxes, for example
mug rosettes, like schnorr, obviate to the problems of growers. the "molla" effect is more accentuated and friction between the components is emphasized by the zigrinatures.

i.e. the split rosette is like a spring, so even if I put it between two flat rosettes does the same work? I trust... The mechanics are you...

 

[MBT]

Why not!
plarad produces (but I don't find on the internet...) screws with a red bolt on the head, like those of the car batteries. when they are at the correct precarious they become green. If after a little work you find someone red you know what to string and how much...

Did you know? .

You mean these?http://www.smartbolts.com/technical-information/feel nomination, never seen though
cost?
Perhaps it is a justified solution in the case of a reducer or something "critical"
to tighten the screws of the feet of a barbeque maybe it's an exaggerated piece, right?

i.e. the split rosette is like a spring, so even if I put it between two flat rosettes does the same work? I trust... The mechanics are you...

In theory...
I've never seen him in practice

 

[Fulvio Romano]

You mean these?http://www.smartbolts.com/technical-information/feel nomination, never seen though
cost?
Perhaps it is a justified solution in the case of a reducer or something "critical"
to tighten the screws of the feet of a barbeque maybe it's an exaggerated piece, right?

That's right. I don't know the cost, but I think it's worth it.
for the feet of a barbeque... depends on what you cook us...

 

[Max-C]

Why not!
plarad produces (but I don't find on the internet...) screws with a red bolt on the head, like those of the car batteries. when they are at the correct precarious they become green. If after a little work you find someone red you know what to string and how much...

Did you know?


i.e. the split rosette is like a spring, so even if I put it between two flat rosettes does the same work? I trust... The mechanics are you...

it makes no sense to put first flat washer as it has a surface greater than that of the grower...

 

[MBT]

That's right. I don't know the cost, but I think it's worth it.
for the feet of a barbeque... depends on what you cook us...

Mah... I personally at most a 5-6 kili of stuff.
a couple of briskets or bacon bombs, no more!

 

[marcof]

i.e. the split rosette is like a spring, so even if I put it between two flat rosettes does the same work? I trust... The mechanics are you...

it works only as a spring but loses its function, more or less efficient, of anti-slip device due to the dentello that, in case of rotation in the sense of unscrewing tends to "tick" the underhead of the screw and/or the nut as well as of the piece.
If it only works as a spring (between two flat rosettes) I don't need a tube, because the force to compress a rosette grover is of some order of magnitude lower than that which is generated when the bolt is tightened to the expected couple, then the spring effect of the rosette is insignificant. if that joint is tightened to the couple holding the rosette in practice the structure shatters like a Chinese picnic table.
compared to simple growers are more efficient the serrated washers; a dentellata per m10 has for example 16 carvings, and as much as the braking system can be little effective it is at least 16 times more than a grower.

 

[Mr.Rio]

So the shifting of the grower is only due to the technological process of production or is it necessary to provoke the entanglement? or the minimum spring effect necessary for flattening is so fundamental?
greetings

 

[meccanicamg]

The question is, "elastic sheath."
I have always considered it a [blando] antisvitation method if it breaks between the nut and the piece, or between the piece and the head of the screw.

One day I saw a bolt where under the head of the screw there was first a split elastic rosette, then a flat rosette and then the piece to screw. I thought "that imbecile this, in this way turn the washer, the elastic rosette if it could also save".

Since that day I have seen dozens and dozens of buildings with this technique. or under the head of the vine - split rosette - flat rosette - piece 1 - piece 2 - nut.
Things are two:
1. I'm an idiot, so explain to me what caxxo needs something like that.
2. They are imbeciles, and the thread ends here.

Thank you.

screw with split rosette that has a k*x and flat rosette for two reasons: both because perhaps more tender than the base material is engraved by the split washer and does not unscrew, both because the flat rosette improves the propagation of the underhead tightening effort to 45 degrees.

 

[meccanicamg]

So the shifting of the grower is only due to the technological process of production or is it necessary to provoke the entanglement? or the minimum spring effect necessary for flattening is so fundamental?
greetings

the grower is suitable for soft materials. the spring effect is useful to ensure a grip between screw underhead and support material before it is all packaged, moreover it is inevitable that the material of the growers allowing a thin perforated ring with so much carbon drawn from the press become curved

 

[Fulvio Romano]

screw with split rosette that has a k*x and flat rosette for two reasons: both because perhaps more tender than the base material is engraved by the split washer and does not unscrew, both because the flat rosette improves the propagation of the underhead tightening effort to 45 degrees.

Okay, let's assume the seal of the cracked washer is perfect. We assume that it is practically welded to the underhead on one side and to the flat rosette on the other. Isn't that the same thing that doesn't put anything?

 

[meccanicamg]

Okay, let's assume the seal of the cracked washer is perfect. We assume that it is practically welded to the underhead on one side and to the flat rosette on the other. Isn't that the same thing that doesn't put anything?

no because there remains a small axial force that does not unscrew and certainly 99% both sides are engraved and therefore with increased grip and however the split washers work when the invitations of a peline. if perhaps unique body, besides having to iron the screw with the preload I have no guarantee of increased friction in avoidance.

 

[Fulvio Romano]

no because there remains a small axial force that does not unscrew and certainly 99% both sides are engraved and therefore with increased grip and however the split washers work when the invitations of a peline. if perhaps unique body, besides having to iron the screw with the preload I have no guarantee of increased friction in avoidance.

I'm sorry, but you have to explain.

the axial force given by the preload of the split washer is less than that of traction in the stem of the vine. a cracked washer m08 squeezing her fingers.
the sides engraved are those of the underhead and the flat washer on the side of that split. the other side is smooth and rests on the piece, also smooth. What prevents the flat washer from slipping on the piece and instead it wouldn't be there if there wasn't that split?