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assembly problems

  • Thread starter Thread starter Yellowmode
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Yellowmode

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I press that I am not very good at using this program, we are reconstructing a model of the lego, once modeled all the pieces we arrived at the assembly stage. we have problems with the rotation of the wheels between them, we made more assemblies (more files) and then put them all together. the problem is: in assembly 1 the propeller turns if I move the wheel (we gave it constrain of angle and axis), once I insert the assembly 1 in the main assembly it does not turn anymore! how can I post the files somewhere?
 
Yellowmode said:
I press that I am not very good at using this program, we are reconstructing a model of the lego, once modeled all the pieces we arrived at the assembly stage. we have problems with the rotation of the wheels between them, we made more assemblies (more files) and then put them all together. the problem is: in assembly 1 the propeller turns if I move the wheel (we gave it constrain of angle and axis), once I insert the assembly 1 in the main assembly it does not turn anymore! how can I post the files somewhere?
Click to expand...
Hello yellowmode, welcome.
What you describe is a classic. the constraints of geometry defined within a "do not communicate" set with those of another set.

to communicate the element from one together with the other it is necessary to make "flexible" the axieme or subaxieme in which there are degrees of freedom useful to us. For two years I don't use inventor I don't remember exactly how to do it but I'm sure you could.

you can post here, you can make attachments in zip format and rar... check:finger:

search in the help "flexibly help"
 
I can't understand what it means to make the axieme flexible! ...
also regarding the rotation of the various objects together.. I can't understand why some people turn around no more, then if I give him the same angle both pieces don't turn anymore.. Maybe I should read a guide on assembly because in class I felt like I understood.. Clearly.
 
Yellowmode said:
I can't understand what it means to make the axieme flexible! ...
also regarding the rotation of the various objects together.. I can't understand why some people turn around no more, then if I give him the same angle both pieces don't turn anymore.. Maybe I should read a guide on assembly because in class I felt like I understood.. Clearly.
Click to expand...
in the browser of the general set, dx button on the set 1, flexible "

Bye.
 
Yellowmode said:
I can't understand what it means to make the axieme flexible! ...
also regarding the rotation of the various objects together.. I can't understand why some people turn around no more, then if I give him the same angle both pieces don't turn anymore.. Maybe I should read a guide on assembly because in class I felt like I understood.. Clearly.
Click to expand...
the fundamental thing of the constraints is that:
1) You must use the real constraints provided by the real component as much as possible
2) leave the degrees of freedom necessary for handling as in reality

valid example for components and/or assemblies (the concept does not change):
- tree 1
- small toothed wheel
- large toothed wheel
- tree 2

the shafts must rotate free and be bound only axially not to escape, to be concentric to the counter bearings. dentate wheels must be ungrateful to its tree by means of a tab or grain or plug or interfering (if there is no mechanical element to block each other from the rotation of a tree/wheel, the planes of the two elements are used). Finally, the two toothed wheels are coupled.

dentate wheels can be correctly and physically or not coupled:
- correctly and physically giving the correct intersection and with the special bond (which I remember as it is called) you can give real transmission relationships
- not correctly or not physically, using only the definition of the intersection without worrying about the transmission of the bike

Surely you have to review your notes. and above all use the inventor tutorials and let the guide :biggrin dance::biggrin:

after a little practice you will see that you can revive this simple problem of constraints
 
meccanicamg said:
the fundamental thing of the constraints is that:
1) You must use the real constraints provided by the real component as much as possible
2) leave the degrees of freedom necessary for handling as in reality

valid example for components and/or assemblies (the concept does not change):
- tree 1
- small toothed wheel
- large toothed wheel
- tree 2

the shafts must rotate free and be bound only axially not to escape, to be concentric to the counter bearings. dentate wheels must be ungrateful to its tree through tongue or grain or plug or interfering (if there is no mechanical element to block each other



the planes of the two elements are used to spin the shaft/wheel. Finally, the two toothed wheels are coupled.

dentate wheels can be correctly and physically or not coupled:
- correctly and physically giving the correct intersection and with the special bond (which I remember as it is called) you can give real transmission relationships
- not correctly or not physically, using only the definition of the intersection without worrying about the transmission of the bike

Surely you have to review your notes. and above all use the inventor tutorials and let the guide :biggrin dance::biggrin:

after a little practice you will see that you can revive this simple problem of constraints
Click to expand...
the problem is that my tree is in the form of crosses (a kind of + extruded), so I have to bind it to the axis, but also obligatory at the corner or cmq attack two faces, usually when I make this second passage will not turn anymore.. I can't understand why. :



"The serrated wheels must be ungrateful to its tree by means of a tongue or grain or a plug or interfering (if there is no mechanical element to block each other from the rotation of a tree/wheel, the planes of the two elements are used). Finally, the two toothed wheels are coupled. "

I don't understand this part. Did you read my private message?
Thanks again!!
 
This is a piece of the axieme, and everything must turn except the piece with the red bar, obviously to me nothing turns:(
 

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if you have to turn everything except the central block red buol say that that component must be "fixed", then binds the other components. all that has male/female cross seat are fake with 2 floors surely or 2 faces. the main stick must be twisted in the red sleeve (which I think does not have the cross seat but has a cylindrical hole) so there will be a concise of axes or a concentric of circular surfaces.

(look well but the cross profile on the outside is a circumference)

always think of the real constraints... take the objects in hand and look at them... I wanted what to do. the laws of nature are few and are the same x any application.
 
"The serrated wheels must be ungrateful to its tree by means of a tongue or grain or a plug or interfering (if there is no mechanical element to block each other from the rotation of a tree/wheel, the planes of the two elements are used). Finally, the two toothed wheels are coupled. "

for this indication let it go, when I wrote it I didn't know you were working with the lego, so actually the links are made differently
 
Yellowmode said:
there is a special way to "fix a piece" or simpler not constraint.. ?
Click to expand...
the "fixing " is simply the opposite of " not the bond "
you seem confused (justly, the constraints are very simple, if you know how to tame them:biggrin::biggrin: )
take into account that a missing bond generates uncertainty to the program, the constraints must be all there and, as mechanicalmg says, must be real, if you have the screws constraints on the holes, if a tree has to turn, binds on the axis and shavings of the bearings, etc. etc.

Bye.
 
I was asking for the simple fact that the first piece of assembly is inserted to me with the exclamation point (not that of error another) and you can't really move! I thought there was a special bond. . I am now trying to convince everyone and hopefully. :
Thank you.

2 problem when finished assembly I should parameterize the helicopter propeller.. any tutorials or advice before adventure? :
 
Are you sure this is an exclamation point?
Look, it should be an icon representing a dot to fix the card. It's right to mean the piece is fixed.
this by default of inventor, the first component you enter into a set is normally fixed.
If you want to make it free, in the browser right click on the component and remove it from "fixed".
 
However I put constrain at the axis and at the corner and it only works for two objects (shaft and a wheel) just put the corner also to the other wheel (always to the tree) here that nothing turns
 
Tarkus said:
Are you sure this is an exclamation point?
Look, it should be an icon representing a dot to fix the card. It's right to mean the piece is fixed.
this by default of inventor, the first component you enter into a set is normally fixed.
If you want to make it free, in the browser right click on the component and remove it from "fixed".
Click to expand...
You are right:), I repeat.. Don't turn! ahahaha ..
 
Tarkus said:
Are you sure this is an exclamation point?
Look, it should be an icon representing a dot to fix the card. It's right to mean the piece is fixed.
this by default of inventor, the first component you enter into a set is normally fixed.
If you want to make it free, in the browser right click on the component and remove it from "fixed".
Click to expand...
You're an idol! It works!
 

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