binding part created in the assembly

[Stan9411]

Good evening, I was experiencing the possibility of modeling part directly in the assembly environment. I use as a reference is a cinematism. I realized, however, that, after modeling the part with a success, I can not bind it to the rest of the assembly so that it moves according to the rest of the cinematism, but remains firm in space. How can I ensure that the parts that are generated in the assembly unit have the correct constraints (pin, slider) with the other parts? thank you very much.

 

[320i S]

if you design top-down starting from zero (and not with geometries already defined before), initially you are forced to assemble the blank part, with rigid constraints; if the part in question is part of a cinematism, you must change the type of bond from rigid to cinematism (cree makes distinction in this grangent unlike other cad).
be careful if you have used external references from the set in question or copy geometry, the first will be removed by redifineing the features, the second will be put in manual update, otherwise if you move the cinematism and leave it in a position different from the "zero" position, they will change all the related features.

 

[Stan9411]

I thank you for the answer but I still don't understand. I'll send you an example photo. part002 is the one modeled in the axieme. as you see its positioning is default and I have no chance to edit it. by right-clicking on the name of the part, between the various commands, I do not see the one to edit the constraints (orange ball with pencil ). I also noticed that the length of the part changes if I move the cylinder and lay it around their center of rotation, which I do not want. must be the part002, turning, to govern the edge of the stem in the cylinder.

 

[320i S]

View attachment 48786I thank you for the answer but I still don't understand. I'll send you an example photo. part002 is the one modeled in the axieme. as you see its positioning is default and I have no chance to edit it. by right-clicking on the name of the part, between the various commands, I do not see the one to edit the constraints (orange ball with pencil ). I also noticed that the length of the part changes if I move the cylinder and lay it around their center of rotation, which I do not want. must be the part002, turning, to govern the edge of the stem in the cylinder.

What version of creo use?
If you select the part0002 from the tree (not the positioning) and right-click, you should exit the menu including the redifiction (just ball with pencil), from entering the constraints, delete the default bond (you can disable it, but being the default bond, it doesn't make sense) and put the cinematic constraints.
the part changes in length, because you modeled directly on the bracket and cylinder, taking them as external references, the program then keeps them as references, adapting the part; you must then remove these references, and give absolute quotas.
normally in top-down design you work in 2 ways, or in absolute (unique on a static component coordinate system) or in relative with own constraints of components (both rigid, but above all part of a mechanism).
if you want to leave absolutely, no one forbids you, but for components like these, only the main bracket goes in absolute, all other components, in relative and view simplicity, even without external references.

 

[Stan9411]

View attachment esempio.zipThanks again for the answer. use creo 3.0. I understand what you mean but I don't know where to look for the solution to the problem. I confirm that, by right-clicking on the birth name made directly in the assembly, the button does not appear to indicate the constraints. I'll send you a folder with the axieme. Take a look if you want to. this time I tried to assign a fixed length of the biella instead of using as references the centers of the holes of the other two components, but as you will see the part002 this time instead of adapting to the movements of the cinematism crashes at the moment of regenerating. I hope that you can clarify practically what steps to do to solve this, because at the conceptual level I understand, but finding the remedy is another story.

 

[320i S]

View attachment 48787Thanks again for the answer. use creo 3.0. I understand what you mean but I don't know where to look for the solution to the problem. I confirm that, by right-clicking on the birth name made directly in the assembly, the button does not appear to indicate the constraints. I'll send you a folder with the axieme. Take a look if you want to. this time I tried to assign a fixed length of the biella instead of using as references the centers of the holes of the other two components, but as you will see the part002 this time instead of adapting to the movements of the cinematism crashes at the moment of regenerating. I hope that you can clarify practically what steps to do to solve this, because at the conceptual level I understand, but finding the remedy is another story.

the problem is soon said: you have created a part together, without any star-part (the second menu after the creation of the model in which you name), you have then modeled using an existing model surface starting from a sketch (which unlike other cad in creo you can do them directly inside the features).
this created the default bond that is closely linked to the sketch you did and you can't remove it, if you don't remove the sketch.
then to solve:
-open birth in another window
- enter the sketch if you want to save it.
- You're getting it.
-Cancels with extrusion
-I'd like default plans
-in the feature of extrusion and embroidery the sketch
-the constraints on default plans
- Come back together and you'll see that you can bind him as you want.

the sketch jumps because you have removed the references together, but you don't have those of part, all right until you move it, to the minimum movement, the program no longer has absolute references and can't regenerate the feature that changed (to me not crascha, but it goes in error).
all the other parts you did, you left a start-part or you created the default plans, this bielletta instead not.

creo does not admit under-winned sketches such as solidworks or catia (actually they also bind geometry, but they do so in their own way), it must have references and all quotas to define clear geometry (although not fixed), it is on this that it bases its "robustness" together.

 

[Stan9411]

Thank you so much!!!! to the possibility to open the part in another screen and to recreate it I had already thought of it but it would not make sense, you would have lost all the advantage of modeling in the axieme. instead saving the sketch, that I did not know you could do, in two seconds the gates and I would regrow it and now finally it does not depend on the rest of the axieme and I can bind it as I want. two lessons in one, thank you so much again!!

 

[320i S]

Don't you think the forum is for this?

keep in mind that in the top-down design with creo (but this also applies to other cads), it is essential to have both the environment, but above all the start-parts configured correctly, otherwise problems like these happen, with the high risk of getting to an advanced stage of modeling, and not being able to do anything anymore, having to remake everything from the top!