origin in one part and in a whole

[genesis1975]

hello to everyone, speaking with a designer, he told me that he had seen a total of mine but that it was not good because the origin fell outside of this, while he showed me a set where the origin was pressapoco in the center of this...I ignore the reason... where you have to place the origin in every part that we do because it comes to the center of the overall and why?
can you change the origins in the parts so that the total meets these requirements?

 

[MassiVonWeizen]

modeling must follow a functional logic and modelling.
if you design symmetric pieces for example will model in order to be able to exploit a plan to mirror functions or bodies; if you build a carpentry of a frame the origin will be placed on hypothetical zero axis or zero piece; on a wheel the origin will be on the axis and on a worked plan from which the working quotas start.
if you have to do an overall modeling will be made so you can use origins and plan for couplings.
These are examples of course, but the concept is that you have to model with logic.
that the origin must be at the center of something, part or total, it is absolutely not true.

can you change the origins in the parts so that the total meets these requirements?

Of course, correctly drawing sketches

 

[drake]

moving the origin of the model after modeling it is a massacre and does not make any sense to do so. You could create a new corrdinate system that stands at a predetermined point, such as the center of gravity.
modeling with only one origin is a top-down modeling, where the parts are created inside the axieme by placing them in the origin of the axieme. the origin of the axieme obviously does not mean the center of the axieme. I have never modeled a group that has the origin in the center of the model.. .

 

[genesis1975]

I still have not understood well what it means modeling down top or top down...also wanting solidworks calculates the center of a piece or a set? how do you apply weight strength in a model or together?

 

[MassiVonWeizen]

https://it.wikipedia.org/wiki/progettazione_top-down_e_bottom-upin practice in top-down modeling make modeling within the axieme by connecting the various parts one to the other with a large number of references between them; the bottom-up modeling involves the modeling of the individual parts one by one (as if I copied the design of the particular) and then assembled, in this case the use of the references between the parts and the axieme is limited.
the first case is used for unique projects while the second when you have details that can be used on multiple projects; then there is the hybrid modeling.
solidworks calculates the center of both parts and axiemi

how do you apply weight strength in a model or together?

mayor thingi?

 

[genesis1975]

Perhaps if I know physics I should not ask this question, but I have parts of cinematic assemblies (bed sofas) that closing the axieme dragging it, they tilted and go under the line of earth, while in reality this part is horizontal a few mm above from the ground line of the feet... it is possible that by applying the force weight in that fully ideal axieme rotates that part that is infulcrata to make it horizontal?

 

[genesis1975]

because this is not good, it does not reflect reality. .

 

[drake]

absolutely not...the calculation of weight (mass actually, of course) does not rotate anything, how could it? sw calculates the mass when it is told to calculate it. the rotation you can do with cinematic studies, not with the simple cad

 

[MassiVonWeizen]

closing the axieme by dragging it, they are tilted and go under the ground line, while in reality this part is horizontal a few mm above the ground line of the legs.

could also be enough to make suitable couplings... but you have to study the axieme.
Did you do the tutorials?

 

[genesis1975]

of tutorials I did, I thought that that of the naked and raw cad is the ideal situation, while if you could apply the weight of the structure in the center that is moved in front, the lever would straighten...c is also a batter that stops the part that is tilted, so pretending to imitate a lever I made a definite couple between the line where it beats and the surface of the part but became me blocked all

 

[drake]

Sincerely, you don't understand what you're doing... if you attach some images would be clearer.
also tries to use a suitable teminology. .
"while the weight of the structure could be applied in the center of gravity that is moved in front, the lever would recede"
the weight is obviously applied to the center of gravity, you cannot apply it where you best believe...
the center of the move by changing the model appropriately.

 

[genesis1975]

here is an image of the mechanism...the last tube in the bottom is tilted and goes under the line of the legs
the hinged piece where the person's head is in open bed...in reality it is horizontal and is a few mm above...the measurements I checked and rechecked

 

[MassiVonWeizen]

is most likely a mating problem

 

[genesis1975]

In what sense, I used the normal couple they needed. You mean the advanced?

 

[Biggmetals]

without the file, which I doubt you can make available to everyone.
you can only keep randomly pulling.

 

[MassiVonWeizen]

I used the normal couple that needed

or mating is wrong or modeling is wrong. but he's right bigmetals... He's shooting randomly