Michelefi
Guest
I'm sorry, but where do you see that it's not loaded? ?
meccanicamg
Guest
I see him nowhere. seeing your design makes me suppose it is. You should tell me that you should know what it is.
What do you want to expect? for a support of a mad roller is that you can expect great science, so that it is usually all very oversized
Michelefi
Guest
my question was not a provocative question, it seems to me that often the answers on this forum are...i have already said that i don't know the type of load, because i haven't been given....comuqnue my questions are only addressed to be able to understand how to behave... as i have already repeated i don't put my hand on these things for a long time, so i don't absolutely remember how to behave.
meccanicamg
Guest
If you write "engineering" I'd say we're talking at the same level and so it's obvious that you can assume load.
Moreover it is quite easy to know, after some projects that things are two:
- or bearings are overflowing
- or are undersized
therefore for the size that has that bearing makes suppose that the load is really low, otherwise two bearings with spacer of some ten millimeters or barrel bearings that are able to carry very high radial load.
talking about bearing mounting tolerances, we have This is what e This is what discussion where there are skf tables.
Michelefi
Guest
next time then I will write to us another profession if it has to be discriminating against...however with effort I have come to the result.
I think the result was good, seeing that those who had to judge it didn't put their mouths on it.
with my times and a little patience in rescuing things I haven't done for a long time.
thank you all for the advice!!
I think the result was good, seeing that those who had to judge it didn't put their mouths on it.with my times and a little patience in rescuing things I haven't done for a long time.
thank you all for the advice!!
meccanicamg
Guest
I think there are several errors that do not respect one or because they are classic mistakes from novice designers:
- general tolerances uni en iso 22768-mk lacks the indication of geometry ( capital letter)
- incorrect quotation of the quarry seeger position because it should be quoted from the step up beyond the quarry and not before the quarry. so much that the seeger is narrower than the thickness of the quarry and there must be air between seeger and quarry when the seeger touches the bearing edge
- How many fixing holes are?
- diameter 35 is not good because it exceeds the diameter indicated on the bearing table and happens that the lateral rs seals scratch on the pin dismanging and damaging the coupling
- if you represent according to one you can not bend the line of quota of the bevels and must be parallel to the main axis of the piece the inscriptions
- missing European projection system
- discreetly unsettled indications on geometric tolerances
Unfortunately there are too many teachers and professionals who do things in spans, then we must not complain that we Italians are not considered in the world of work... .
the errors I reported to you are the classic ones that in my time teachers beat hard because fundamental and unfortunately very frequent.
- general tolerances uni en iso 22768-mk lacks the indication of geometry ( capital letter)
- incorrect quotation of the quarry seeger position because it should be quoted from the step up beyond the quarry and not before the quarry. so much that the seeger is narrower than the thickness of the quarry and there must be air between seeger and quarry when the seeger touches the bearing edge
- How many fixing holes are?
- diameter 35 is not good because it exceeds the diameter indicated on the bearing table and happens that the lateral rs seals scratch on the pin dismanging and damaging the coupling
- if you represent according to one you can not bend the line of quota of the bevels and must be parallel to the main axis of the piece the inscriptions
- missing European projection system
- discreetly unsettled indications on geometric tolerances
Unfortunately there are too many teachers and professionals who do things in spans, then we must not complain that we Italians are not considered in the world of work... .
the errors I reported to you are the classic ones that in my time teachers beat hard because fundamental and unfortunately very frequent.
meccanicamg
Guest
other thing... with diameter 35 you will not be able to mount the external seeger as it is the last to mount. you have to use the beaked pliers folded but with little space it doesn't fit in because you also have the big flange just behind that limits the movements.
But do you have to consult? there are all the indications of how you quote and many things to control. use it and browse everything that will help you reduce errors.
But do you have to consult? there are all the indications of how you quote and many things to control. use it and browse everything that will help you reduce errors.
Michelefi
Guest
OK thank you, I will make use of your advice. I just wanted to say that I try to do my job well and if I'm wrong I try to understand where and correct me... who judged me maybe is incompetent, but it's comuqnue of people who do this job, if they tell me that it's okay I believe in it.
Thanks again
Thanks again
Michelefi
Guest
The "I believe" just meant that in my ignorance if they tell me it's okay, how do I know it's not okay?! ..I'll buy the baldassini
meccanicamg
Guest
If you're really an engineer, I'd say it's necessary to have manuals and books for the profession, you should have them for the study to become an engineer.
Of course, to go well, for example in most workshops, you don't need the geometric tolerances you put at all. for example no one will make you 0.8 where there is the bearing seat because sending it to rectification costs 150€ plus that piece and they would miss the center holes, so that everyone would make it back with widia insert with roughness 1.6 that is practicing the maximum that you can do with an old standard lathe.
the rays you have marked apart the big one will be made with r=0.4 or r=0.8 because they are the rays of commercial plaques and will not be interpolated to make such a small radius even with cnc.
as you see who are different views: theorist, the practical, the cellar etc. etc.
depends where you clutter, but it is good to know all three ways because depending on the situations it can serve in a targeted way one of these modes.
even the fact of quotating each step could be opinabile and in parentheses the total. probably it's the first lower share that doesn't matter. instead should have it from the floor pad flange and perhaps tolerated.
as you see, we need to create the critical spirit of analysis and evaluation.
Michelefi
Guest
I'm a real engineer...the mechanical design exam I supported, what you saw, I pulled out the old cremonese manual, trying to find ifnormations that at the time I definitely knew to find unfortunately, but, I left the university I did anything else for years....this is because now it's difficult to find work as an engineer. ..said this I am very rusty, it seems to me that your point of view is as a professional in the field, I am just one who has to enter this world
meccanicamg
Guest
for the cremonese that I imagine you have the two volumes one blue and one black I recommend you go to the site edizionicremonrse and download the wrong corrige because in its time they were a centimeter and a half of back front sheets ... is the manual that I hate more because it has many errors in formulas, badly organized as division of arguments and lacunoso on different aspects. The baldassini sucks like graphics but has everything you need to draw and get out of the most common nails. formulas for coconut of forces, levers, etc. standard material, metal materials and not, geometry and other things.
If you want to have better texts, I recommend sighley. if you are looking for there are posts here on the forum where we talk about texts for design.
in this book/manual speaks of sizing of mechanical organs: bearings, gears, straps, pins, bolts and welding. we talk about building science: encoding materials, efforts, actions and reactions, static and fatigue analysis, validation criteria.
If you have to enter this world I highly recommend it to you.
meccanicamg
Guest
the title of the book is shigley's mechanical engineering design. is in English. then if you tell me the industry and the things you need I can address you on some books specifically
Michelefi
Guest
mechanical engineering design (shigley)...questo??
Michelefi
Guest
ah sorry I didn't see... thank you
Michelefi
Guest
What I was interested in was to understand the technical drawings well... not to make mistakes like those you indicated me. .. simple but precise explanations
meccanicamg
Guest
there were 20 minutes of problems at the server.... Now everything works.
in fact well there is a series of 3 books, from the project to the product ... green cover.
nothing is found, because it is necessary to mix with norms in addition to books
in fact well there is a series of 3 books, from the project to the product ... green cover.
nothing is found, because it is necessary to mix with norms in addition to books
Michelefi
Guest
I saw on amazon at $235... I also found pdf
meccanicamg
Guest
No doubt it's worth that money... not like the Italian manuals that leave much to desire. There's something to wonder why they send the Chinese to study.... and they become great.
Michelefi
Guest
Well I would have gone willingly to study in use, but it all depends on the economic availability