special plastic tolerances

[dandao]

hi to all,I have the following dilemma:I have a particular printed in polypropylene and the customer tells me that they are out of tolerance with the quota 459.5 mm that turns out 461.3 mm and indicates me as field of tolerance + or - 0.7 mm
the design at that quota does not bring tolerance, but a reference standard that is the din 16901 - 130
consulting the norm according to me tolerance and + 0 - 1.5 mm x lengths ranging from 400 to 500 someone can confirm it?
this blessed incriminated quota (459.5 mm) and formed by 5 subquotes (see attached image) of which 4 with tolerance + or - 0.5 mm therefore the field should be + or - 2 mm

conclusion:

according to the customer the quota can go from 458.8 mm to 460.2 mm
according to me (checking the norm) the quota can go from 458 mm to 461 mm
with the sum of subquote tolerances the quota can go from 457.5 mm to 461.5 mm

Can someone tell me the right solution?
Thank you all and I apologize x this very long post

 

[SHIREN]

according to the customer the quota can go from 458.8 mm to 460.2 mm
according to me (checking the norm) the quota can go from 458 mm to 461 mm
with the sum of subquote tolerances the quota can go from 457.5 mm to 461.5 mm

Can someone tell me the right solution?
Thank you all and I apologize x this very long post

Hi.
It's a pro or a designer's prob
can not enter two free central rates
and then give you to extreme tolerances +- 0.5
however standard or not
means that the tolerance range goes from 457.5_461.5
always considering that the central quoti are free
the designer had to tolerate you also on 459.5
Anyway ohhhhhhh customer is always right: mad::frown::angry:
I suggest you understand what the piece needs in which context is to be assimilated and why the customer contests you
has times you have surprises
Thank you very much

 

[PierArg]

Hi.

I think that design should be interpreted as if the quota (99.5) was not there: according to the tolerances you can get to the extremes you must realize the central part of a length necessary to drop 459.5 in din tolerances.

 

[SHIREN]

Hi.

I think that design should be interpreted as if the quota (99.5) was not there: according to the tolerances you can get to the extremes you must realize the central part of a length necessary to drop 459.5 in din tolerances.

Hi pier.........
the dandao friend
you must defend against the accusation of your client:finger:
then the quota 99.5 +- 0.5 is and should be interpreted

then on a particular polypropylene printed with a size ( huge) who knows about molding also knows that the 1/2 mm extra or less can be adjusted in the injection parameters press
I wish you a good weekend
Thank you very much

 

[PierArg]

Hi pier.........
the dandao friend
you must defend against the accusation of your client:finger:then the quota 99.5 +- 0.5 is and should be interpretedthen on a particular polypropylene printed with a size ( huge) who knows about molding also knows that the 1/2 mm extra or less can be adjusted in the injection parameters press
I wish you a good weekend
Thank you very much

hi shiren,

the fact that it is in parentheses () means that it is auxiliary / redundant; in poor words it is for those who read the drawing to avoid making unnecessary calculations.

As for the tolerance you get for molding you are right... ask 1/2 mm over 500 mm is a bit risky.

Good weekend to you too.

 

[PierArg]

Look what I found:
http://www.cad3d.it/forum1/showthread.php?t=13952

 

[dandao]

thanks x the answers,
definitely the customer always right,
and we are evaluating the solution together.
for now the contestation has come from the control acceptance of the new products (design control with the piece) now will be carried out assembly checks and will proceed to the accommodation (action on the mold) only if with the assembly will really present problems.
molding tests were performed with negative outcome
However I was looking for confirmation if my interpretation of the rule din 16901 - 130(+ or - 1.5 mm) and just
if you do not understand where the customer takes the tolerance of + or - 0.7 mm
Hello and thank you

 

[PierArg]

thanks x the answers,
definitely the customer always right,
and we are evaluating the solution together.
for now the contestation has come from the control acceptance of the new products (design control with the piece) now will be carried out assembly checks and will proceed to the accommodation (action on the mold) only if with the assembly will really present problems.
molding tests were performed with negative outcome
However I was looking for confirmation if my interpretation of the rule din 16901 - 130(+ or - 1.5 mm) and just
if you do not understand where the customer takes the tolerance of + or - 0.7 mm
Hello and thank you

Hello, dandao.
I press that I do not know the din norm but I have the impression that it is specific for plastic molding.

As soon as I find something, I'll let you know.

 

[PierArg]

Here we go:
http://www.victronics.cl/inf_tecnica/burr brown/bopla/en/info/kutol.htmlis a standard for plastic molding and follows the same criterion as for elastomer seals.

 

[dandao]

Here we go:
http://www.victronics.cl/inf_tecnica/burr brown/bopla/en/info/kutol.htmlis a standard for plastic molding and follows the same criterion as for elastomer seals.

therefore according to the norm the tolerance x a piece of 459.5 mm falls into the field from 400 to 500 mm therefore and + or - 1.5 mm

Thank you.

 

[SHIREN]

therefore according to the norm the tolerance x a piece of 459.5 mm falls into the field from 400 to 500 mm therefore and + or - 1.5 mm

Thank you.

Hi.
except otherwise specified

 

[IPdesign]

Welcome to the club,
It's quite common for the helper brothers to collide with these diatribes.
that is why I took the vice to control precisely the incongruent tolerances

a good designer should not have put the final, or at least as it was said in parentheses.

then as brother shiren says the customer is always right and these periods I add "especially if pay"

good work at all

 

[PierArg]

a good designer should not have put the final, or at least as it was said in parentheses.


good work at all

super-quota

 

[dandao]

Thank you all x the answers

Hi.