Yes Burunduk, this is almost the case, thank you...one doubt: the right picture at the bottom, shouldn't be a "constrained" state instead of "restrained" state?
wow 3DDave, interesting topic...my field is mainly plastic injected parts...they are for sure non-rigid but also not metal parts and i think that this can change the game here...thank you very much again anyhow...!
Thank you Burunduk and 3DDave for your feedback and suggestion…you are right, even if i put this note, i do not have the perception of what can happen if the gap of some datum features is 2 or 10 mm from the pad of the clamp…maybe it could be a sort of warning for the production plant or...
Burunduk:
i'm talking about controlling datum features...but i know that now you are going to tell me: you can't control the orientation of the datum features because THEY are the REFERENCE to orient ALL the other features [bigglasses]
3DDave:
how do you know i'm a italian car designer...
I imagine that if the part is on the shell for a long time maybe it will have a very strong deviation and even if i can not see when it is constrained in the assembly in its normal life, it can have strong tensions inside causing BSR problems...so the idea is to check the datum features in a...
3DDave, sorry for the inaccuracy: let’s say we have non rigid part with the note in the drawing about how to constrain before measurimg, then you have in some area this tolerance of profile with the free state modifier and the datums also in the reference frame, is this annotation valid in...
hello to everybody!
short question: can i have a profile tolerance with the free state modifier and also datums A,B,C in the reference frame? thanks a lot!
3DDave,
the 0,2 range comes exactly from this: maximum theoretic interference (in reality we have deformation and stress) of 0,4mm between this part and its counterpart is allowed...now, if we know that the deviations come from form tolerance (the nose can be bigger or smaller in term of size)...
But if the cad model is the reference why we still need to put datum targets? once we say that curved surface is datum feature B with CMM machine they can touch several points on the curved surface then the software can calculate the deviation from the cad model and check if the surface is its...
Burunduk,
in product development today we use mainly cad models for toolmakers or inspectors...this means that we can skip all the basic dimensions info to locate tolerance zones and just to put the info about where are the datum features on the part? this means that every relation among datum...
Thank you very much for your quick feedback...
Burunduk, if i put the profile tolerance on the entire nose how can i check the orientation? because it can happen this
so the entire profile maybe is in target for the profile(red lines) and also for the fos (xx)...but the nose is bended...
Hello to everybody,
i have a complex plastic part...the strange "nose" you can see in the picture attached is used as locator (datum feature B): to qualify this datum feature i have the size dimension on B but how can i check the orientation to A? It is a complex and irregular feature without...
Sorry for long delay in the answer but it is busy time with kick-off of the tooling... [censored]
Continuing the discussion: yes we normally have multiple datum features as primary datum and all these datum features have sort of Destaco clamping features for restraining the parts...so if i put...
Maybe also my english is not so good sorry for that[neutral]…i need to sketch up something to be better understood…normally working with flexible plastic parts we have complex parts and small features (like the bad picture i attached above) working as multiple datum features, and these multiple...
Thank you Greenmini for your prompt replay!
I understand that…but this means that when i put the part on the primary datum feature simulator of the gage i will have the datum feature (bent) aligned to the datum and all the part out of tolerance….is there any way to check the orientation of a...
Hello All,
i can not get this concept: if i have a not so rigid part like an injected molded part...this part has a feature, sort of planar small surface, that is the datum feature that represents the primary datum so how can i qualify this primary datum in term of orientation? i can put a...
