dimensional tolerance

[reye]

hello to all, in the table present at the following link http://www.cad3d.it/forum1/showthread.php?t=29915&page=3 could I use in the 4 central holes and in the one on the left the dimensional tolerance h7? How to behave with the semicircle on the right? Thank you.

 

[calacc]

I was based on the request in question: "specifying the dimensional tolerances that are considered necessary for its operation" arises spontaneously to wonder: what caxxo is its operation??? ? What should be coupled to those holes of me? no, because I believed that dimensional tolerance involved a coupling between components (but perhaps it is not so). It is from these things that we see the inexperience and lack of application of knowledge to productive and industrial reality.

Sorry for the digression, we come to the problem... We assume that (eh here you have to use the fantasy ) the 4 central holes are fastening (no tolerance), the "semicerchi" (as you call them :tongue serve to a bolted joint (also here nada), the only tolerance that I would put if I happen a task so would be a very phony h8 in the hole of sodom!
I apologize for the kind of funny way of responding, but I've got a lot of nerve seeing this.
And tell the eva of not being caxxate, a big one was enough at the beginning of time and we don't want any more.
See you soon.

 

[reye]

Imagine you think I was an entire afternoon looking for that damn platelet to see if I could find some application, with highly depressing results.

 

[calacc]

don't waste too much time when you don't need to run behind fleas then they can run away elephants!

 

[Ste_d]

I'm sorry, but what's the table?! I don't see any drawing at that link...

 

[calacc]

and' questa!

 

[vale61]

first you see the tables on general tolerances and put them on the cartilage.
to define them, you could use an average grade, so you don't know what it takes.
on the 4 holes of 12 you can assume two diagonals in h7 for centering and the other two for connecting screws, interasse +/-0.05.
hypothesizes the 25 hole as a compass center?
the two semi-asoles consider them as a passage of bolts.
if you take into account the assumptions I gave you then from the baldassini (or manual of the equivalent designer or online tables) you can get everything.
keep in mind the departures of the quotation as well as for the functionality ' also serve for those who should then force it (nc,fusion, printed ... maternal) and then check, also on this topic the baldassini removes any doubt ...

I deliberately gave you some incomplete hints because it's right that the exercise will solve it by deepening the arguments you don't know, in case you find yourself firm because you don't understand the functionality of the object I suggest you define it by inventing you a function so that material, quotation and tolerances you put are adequate to the functionality you defined.

Have fun.

Bye-bye.

 

[Ste_d]

boys the speech of these exercises is very simple... drawing is at the first year while of tolerances comes to speak in depth to the specialist practically. the fact is that a student in reye conditions (but also my a few years ago) is not able to perform such a thorough analysis... but not even the drawing course requires it!
So I'm not telling you to randomize them, but the prof in question wants to see that you can write them on the drawing properly... all here! that then is a h7 or h6 does not matter anything for the purpose of the course. In fact, the text does not mention the operation and/or use of this particular.
the hypotheses of vale are a great point, I would be in you right on those and put the tolerances accordingly. you will have all the time in the next courses to learn how to manage tolerances decently!

 

[calacc]

eye that more tolerances you put more increases the cost of the piece! Put them where it is not expressly necessary to operate is a blasphemy in mechanics! Then maybe he'll get you a better vote on the exam, who knows?

 

[PierArg]

eye that more tolerances you put more increases the cost of the piece! Put them where it is not expressly necessary to operate is a blasphemy in mechanics! Then maybe he'll get you a better vote on the exam, who knows?

I share what you say but, if it's only for educational purposes, maybe it's better to "abundle".

actually serves the prof to assess whether the student understood the topic of tolerances.

If it had been an examination of mechanical technology instead the speech changes and perfectly marries what you wrote.