input tolerances

[maksimon]

Hello everyone, I apologize if I didn't show up, but I can't find the section.
I've been writing for a while, but it's the first time I write.
I would need to understand with what criterion to insert geometric and dimensional tolerances. I explain better: I have a design to give to the supplier, in such design I will have to put tolerances, but from where do I start?

the component in question is a base 327mm x 318mm h15, with various threaded blind holes. Nothing more. What tolerances do I insert?
Thank you very much for the help you give me.

 

[MassiVonWeizen]

Meanwhile ask yourself... What's that for? What's going on?
then you have to tolerate holes? The plate? Are there other jobs?

If you've been in writing for a while, and you've been following the forum, you should know that the information you gave is absolutely insufficient... .

 

[New Rider]

hello if I can help you.. as already explained by stones you have to understand first of all what kind of use will go to make that kind of plate.
take into account also that more limited dim/geom tolerances put more the piece needs attention in the processing phase (more cost ).
In addition, there are already more or less restrictive series of tolerances dim. that for "generic" applications can go more or less well.
It is also necessary to understand how much the workshop or who will make the piece will be able to descend into precision during the creation of the piece.
and finally also control of dim and geometric tolerances needs more or less sophisticated equipment perhaps not always present in some places.

 

[meccanicamg]

In addition, a cartilage normally refers to general tolerances uni en iso 22768. first consult the norm or its extract.
then if you have special applications in the most restrictive or lasche tolerances. For example, if you have to make a hole for cable passage, you could do for example diameter 40 +/- 5 so they can make it a tip and what comes without having to have a special tip or make a barn or outline with a candle cut.
all depends on the functionality of what you put on it.

 

[maksimon]

thanks for the answers. the base will support an ac/dc converter, a power module and electronic cards. I don't think it should have narrow tolerances because the components don't have to fit perfectly, as long as the holes between cards and base are concentric. I honestly don't know the degree of precision you have to have. this base will be produced in 1 or 2 exemplerari being a prototype. the client asked me to change it and to make the table, but I never entered tolerances from 0. I know that a standardized cartilage already has drawing tolerances. so to put particular tolerances you should interface with supplier and customer, right?

 

[meccanicamg]

Sure you have to interface with who sells the pieces to fit for sure.. Other holes are not found

 

[maksimon]

Sure you have to interface with who sells the pieces to fit for sure.. Other holes are not found

That definitely. I still have the whole assembly.
now the question that arises spontaneously is: what type of normalized dimensional tolerance do I use? I think your answer will be: talk to the customer, right?