plastic material tolerances

[Debora___]

Hello everyone, I just joined the forum because I am facing a problem in designing an internal door panel for cars for a university project. some research shows that the most common material is polypropylene, therefore plastic. the associated legislation would be din 16901. should this rule be indicated on the paper? if yes, it is correct to indicate din 16901 mk? Moreover, they contain plastic materials, in the definition of dimensional and geometric tolerances, do you follow the same approach used for metal materials?

 

[meccanicamg]

din 16901 is the norm for plastics and in it are indicated the criteria of acceptability to be straight or things like that. you cannot mix the word from en 22768 with the other norm.
You better take the norm and light it.
for a university job I would not worry about the margins of acceptability of plastic size unless you are studying a mold and post-mould plastic retreat.

 

[meccanicamg]

If you can with one rule stay in the parameters of the other.. .http://radel.co.za/website/attachments/081_technical information on plastics.pdf

 

[TECNOMODEL]

I do not know the norm in question, what is it?
However, indicating it on the drawing is certainly not wrong, perhaps accompanied by a note.
for tolerances the approach is the same, of course you will have to choose tolerances that are compatible with the production process by injection molding.

 

[Debora___]

would you have a good text to suggest to learn well how to quote and tolerate mechanical components?

 

[meccanicamg]

What base do you have? Are you an expert? scientific? What do you know? give us more info to know what to recommend

 

[meccanicamg]

basic you have to know well the mating rules, tolerances, roughness and some gps standards.
then some logic and common sense.
on technical drawing books there are recommended couplings. It would be a starting point.

 

[Debora___]

What base do you have? Are you an expert? scientific? What do you know? give us more info to know what to recommend

I'm a vehicle engineering student. the basic rules of design I know you and university texts but I would like to have some notion a little more practical. some text that is perhaps used by those who work as a reference manual or on which to rest to stay always updated or to refresh the basics.

 

[meccanicamg]

vademecum for designers and technicians of hoepli.
manual rules un volume m1.