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i ask for help with these ball bearings

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iron_mec

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Hello everyone, my name is antonio, I am a mechanical engineering student, I am trying to expose a three-year thesis regarding the possibility of being able to find a possible solution regarding the case of mechanical design and sizing of the possible desired bearings, asking someone of you expert an opinion and if better also a advice for correction of the the thesis that I should expose to... and that in theory the bearings should solve with simplicity with the dynamic load coefficient choosing the right range of bearing from the catalogue suitable to interpose to the transmission shaft that peeking from some very old text of books one of the new techniques of eschmann and the other two volumes of the hoepli of accounts two introvabile texts together with that of the new techniques that I managed to purchase through ebay under the advice of my prof, but returning to the speech place a pdf file hoping it is clear to all and understandable where I place a theme regarding a check to grip of the rolling tracks the other on the auto ignition temperature on the heating of the contact slopes and a last on the possible check to slip of the rolling bodies when the speed of regime tends too to drain the limits by overcoming a certain pair of volving friction that would tend to rub the spheres or the rollers worst. I ask you, please help me find a feasibility and if you prefer a council to milead thesis...
Antonio. .
 

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Bye. Although all if they hold her tight bearing theory are things that should be available for at least 20 years.
then bearing builders think us well before spreading the theory and let us use formulas far from the physical principle....
 
experimenting with these formulas I realized that the relationship between the struggling life of the bearings and that calculated with these methods using the Hertzian contact tensions the relationship does not differ so far from value 1.. I wanted to find in this forum someone who seeing the files could help me improve a possible correction for the thesis to further improve it .. all here
 
try looking on the forum because I seem to remember at least one similar discussion and you could receive a hand directly from him who has already done thesis and has familiarity in the bearing field. but I don't remember the name or the discussion....but I remember we talked about it.
 
I'm not telling you anything about bearings because I'm gnurant, but for me it's inconceivable that a university student, even in theoretical physics, writes like that.

I will be antipathic and all the other adjectives you want/want to use, but take it as advice and not as an offense: try to write in a decent Italian. a relationship defines you, with a customer.

you understand, but before sending you have reread, just as an example: "am I trying to expose (at this moment? a three-year thesis concerning alla possibility to find a possible solution concerning the case of mechanical design and sizing of possible (possible compared to what?) desired bearings, asking someone of you expert an opinion comparison and if better also a advice for correction of the thesis that I should expose to"?

io ho capito questo: I am preparing a thesis in which I try to deduce a simplified method for the design and calculation of the desired bearings, whose correctness I would like you to help me evaluate.
Do I get it right?

and I have some doubt you live in the undergrowth. . .

Bon, bannatemi
 
ragnol said:
I'm not telling you anything about bearings because I'm gnurant, but for me it's inconceivable that a university student, even in theoretical physics, writes like that.

I will be antipathic and all the other adjectives you want/want to use, but take it as advice and not as an offense: try to write in a decent Italian. a relationship defines you, with a customer.

you understand, but before sending you have reread, just as an example: "am I trying to expose (at this moment? a three-year thesis concerning alla possibility to find a possible solution concerning the case of mechanical design and sizing of possible (possible compared to what?) desired bearings, asking someone of you expert an opinion comparison and if better also a advice for correction of the thesis that I should expose to"?

io ho capito questo: I am preparing a thesis in which I try to deduce a simplified method for the design and calculation of the desired bearings, whose correctness I would like you to help me evaluate.
Do I get it right?

and I have some doubt you live in the undergrowth. . .

Bon, bannatemi
Click to expand...
thanks for correction.. I have to make at least one more effort before posting, and a little serious this... you did well, I don't say anything else. .
 
the documents you posted are a collection of data disarticolata without comments or apparent logic so that difficult consultation and for this it will be difficult to help you.
I think you have to work a lot on the concept of what is a thesis and how it should be built.
in this regard I will send you This link to see large lines as structure and quest'altro where there is an example from which you can draw inspiration. when you have compiled a structured and understandable document we will see if it will be possible to give you useful information on the subject.
 
TETRASTORE said:
the documents you posted are a collection of data disarticolata without comments or apparent logic so that difficult consultation and for this it will be difficult to help you.
I think you have to work a lot on the concept of what is a thesis and how it should be built.
in this regard I will send you This link to see large lines as structure and quest'altro where there is an example from which you can draw inspiration. when you have compiled a structured and understandable document we will see if it will be possible to give you useful information on the subject.
Click to expand...
displaying the two files that you kindly sent me, and then you were nice tetrastore.
I had to realize that the work to create a thesis is long enough.. .
I believe that the thesis that I have to expose for the three-year degree will be very long and elaborate, despite it will certainly take a long time and a lot of calm concentration and patience. Although as I realize that I have to be very close to the eye from grammar and what I write, following a logic, and following the order for every detail to determine it.
I also realize that given this kind of problem and dimensioning hertzian bearings for the thesis, it is not so easy and discounted to demonstrate everything, passage x passage and to make to the teacher and the reader understand the various passages and demonstrations, because the theme and reported on new topic never addressed in university courses but intuited through various texts now introvable as to eschmann's new techniques and the other two volumes of the hoepli of accounts, introva. and then everything would take long months of work and sacrifice and commitment that would certainly not be of whole days. . .
 
ah... have you found out now that preparing an engineering thesis, even the three-year term, takes time and work? in (minimum) 3 years of exams you've never compared, you've never heard rumors of corridor, have you never seen people cry in the faculty library?

Given your #11, I think we could all find it very useful to read this booklet: "do not feed the troll" of q. scinetti.
 
on a text in English of a good book handbook lubricant and tribology I found in these two pages these formulas for calculating dynamic load.. I don't know if compared to those regulations you posted me and that I couldn't access for the cost of 206 euros.. I could settle for these as long as they are formulas equivalent to ISO 281 : 2007
 

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iron_mec said:
the site unfortunately and payable. . 😞
Click to expand...
always use google: I would also tell you to check if your university has an agreement with kisssoft.
between the various modules of calculation, by memory, should be there also one dedicated to the calculation of bearings.

a calculation module is also present in autodesk inventor (both with iso method 281 and with skf method), although more "technical/practical" and "theoretical".
 
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tzadik said:
always use google: I would also tell you to check if your university has an agreement with kisssoft.
between the various modules of calculation, by memory, should be there also one dedicated to the calculation of bearings.

a calculation module is also present in autodesk inventor (both with iso method 281 and with skf method), although more "technical/practical" and "theoretical".
Click to expand...
thank you very much..tzadik
 
hello tzadik thanks again for what you posted me.. By reading the iso regulations you sent me, I wanted to idealize the iso standard of bearings for calculation of fatigue duration, wondering if this formula could be potentially idealized for fatigue calculation for other components such as to e.g. dentate wheels, cams, pistons, etc. we say all the components where the pitting must be verified beyond the condition of the lubricant for the estimate of fatigue life. . .
i.e. if at the calculation level use the legislation iso simplify and idealize it by extending it also for other mechanical components, if this can be feasible at the calculation level.. Do I stay with the question mark? ?
 
This is not a formula but a complete procedure which also includes the choice of the value of some graph/table coefficients (the result of physical observation).
and this often happens in the engineering field (see for example a verification of a structure according to ntc 2018...).

for other mechanical components, there are dedicated regulations because stresses are different (as is the choice of materials).
the conditions that lead the pitting to be critical for the useful life of a bearing, are exceptional conditions, obviously out of the design conditions: If so it does not mean that something has been neglected during the project.

demanded, for example, because for bearings (excluding particulate cases) a "high chromium" is used and not other types of reclaim steel.
 
ok everything clear what you say.. Therefore it is not advisable and it is not allowed to calculate and hypothesize a standard of bearings, for the calculation of lubrication fatigue and extending it on other components, where no regulations are specified in particular on cams, I think.. or worse still mix regulations e.g. iso with Agma if it is gear?
 

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