assembly

[Mario887]

hello to all I am new to the forum my name is Mario and currently aviation study at the university of roma.
I have from 1 started to use solidworks and are struggling with a design of a front trolley of a aircraft.
the problem that has arisen is in the cinematics of the final assembly.
I would need to insert the "assembly" file of solidworks so that you can give me a help, I hope it is allowed. practically what happens is that a simple manovellism that on paper (making a bit of calculations and graphic simulations 2d) seems to work wonder, in reality when I fix a bearing around which all the tavellism should rotate, solidworks instead I notify me that the selected element is completely defined therefore has no freedom of movement.

opening the file "sesta version....sldasm" by binding the "igus cushion" as "fix" (fixed part to a large frame, as well as "hinge pin"), putting the concentricity relationship with the element "tubo tube snodo shock absorber and piston", then the "superior shoe" should at least describe a fixed angle with the "top edge"View attachment Manovellismo Carrello Anteriore.rar

 

[meccanicamg]

I don't have a chance to look at your files though if you put a fixed bond to a component, it will never move in space. If the compass is fixed in space, its pivot must have at least one degree of rotational freedom.
if you use motion module for the cinematics, be careful that some constraints are removed.
You better do some tutorials before you do something challenging.

 

[Mike1967]

hello to all I am new to the forum my name is Mario and currently aviation study at the university of roma.
I have from 1 started to use solidworks and are struggling with a design of a front trolley of a aircraft.
the problem that has arisen is in the cinematics of the final assembly.
I would need to insert the "assembly" file of solidworks so that you can give me a help, I hope it is allowed. practically what happens is that a simple manovellism that on paper (making a bit of calculations and graphic simulations 2d) seems to work wonder, in reality when I fix a bearing around which all the tavellism should rotate, solidworks instead I notify me that the selected element is completely defined therefore has no freedom of movement.

opening the file "sesta version....sldasm" by binding the "igus cushion" as "fix" (fixed part to a large frame, as well as "hinge pin"), putting the concentricity relationship with the element "tubo tube snodo shock absorber and piston", then the "superior shoe" should at least describe a fixed angle with the "top edge"View attachment 45219

I had a look and the hive was coming.
too many couplings, some repeated and unnecessary, learn to create under assemblies so as to streamline the couplings together that will contain the whole project. I don't understand the movement that has to do the mechanism, so if you place a couple of screens (open/closed) I see if I can give you directions.

ps: insert, in your profile, the version of solidworks you use senno you go to the dark...

 

[Mike1967]

make the sketch visible as the first image, then you will use the center point of the circle to insert two "distance" couplings to two fixed planes, in the specific case those that I used.

 

[Mario887]

make the sketch visible as the first image, then you will use the center point of the circle to insert two "distance" couplings to two fixed planes, in the specific case those that I used.

hi mike1967, very kind and very fast.

I would never have thought that I had complicated the couplings much to achieve the final goal, I had reasoned enough to reduce as much as possible the number of ahaha relations...but it is seen that I certainly have little familiarity with the assembly and I had the opportunity to see few properly made assemblies that gave me reference models.
I did not understand the part where you explain to me the "assiemi" if I can ask you some guides to consult I am very happy to do so.
I announce that I now try to change the coupling of the "igus pad" with the distance constraints and see how it goes.
Thank you

 

[Mario887]

I answer you with a drawing on the flight of the movement I'm trying to achieve:

 

[Mario887]

it works!!! Thank you very much. Now I want to understand what and where I was wrong and if I can study something about it

 

[Mario887]

Good morning again. I am always working with surfaces imported from a program called "thinkdesign", saved in igs (I have the possibility to salt them in various formats if it happened)...I have several problems with the attempt to "health" of the surfaces and "gaps" that occur with the diagnostic of the import. However, I must say that, with the two parts I needed most, I managed at least with them to have a unique surface without problems. I have noticed that most of the times that there are holes, the "sketch" of the contour that delimites them is always divided into several arches instead of having a single one that thus gives me the possibility to select it and establish a couple of concentricity or/and coincidence with the other interested.

Now, the situation in front of them is that of a higher surface and a lower one that both have an extruded cone that must therefore match one within the other. with the problem I have described above, however, I cannot use neither the internal surfaces nor the sketches precisely that delimit the edges of the bases of the cones (just because each of them is divided into more) so that it can mate them, in fact it allows me only tangency couplings. I can't find solutions. ..what I think could help me is to make a general offset of the surfaces so as to try to generate a solid...but I often tried, even with tutorials on youtube but when I start the command always gives me error.

p.s.
I insert the two attachments of the new surfaces again, while others to make the assembly work you can recover them from above. the coupling must be between "superior hull..." (modified by lifting the central cone, then only the "hole" that remains) and lower famine..." and then between "wheel" and "lower hull. . . "

Thanks again

 

[Mario887]

file rar:View attachment Superfici.rar