assembly constraints

[nkt]

Bye to all,
I use solid edge usually, but now I have to do a job with nx 7.5.
with solid edge I created an assembly and with the constraints I blocked the various parts.
Now I'm trying to do the same thing with nx using the constraints.
Let's make a simple example.
I have 2 parts:
- a block with a hole
- a cylindrical pin
mute the block inside a assembly file and lock it to the ground.
Then I add the pin inside the assembly. now to eliminate the various degrees freedoms I should bind it with the following constraints:
- distance bond
- concentric bond
- rotation block bond
I put the distance bond is so far ok, but then if I put the concentric bond only accepts the edges and not the surface, and if I use the edges the distance bond goes in error. I then used the alignment between the two axes, did I do right?
Now if I look at the degrees of freedom I only remain that of rotation, how do I block rotation?

Thank you.

 

[axa]

Bye to all,
I use solid edge usually, but now I have to do a job with nx 7.5.
with solid edge I created an assembly and with the constraints I blocked the various parts.
Now I'm trying to do the same thing with nx using the constraints.
Let's make a simple example.
I have 2 parts:
- a block with a hole
- a cylindrical pin
mute the block inside a assembly file and lock it to the ground.
Then I add the pin inside the assembly. now to eliminate the various degrees freedoms I should bind it with the following constraints:
- distance bond
- concentric bond
- rotation block bond
I put the distance bond is so far ok, but then if I put the concentric bond only accepts the edges and not the surface, and if I use the edges the distance bond goes in error. I then used the alignment between the two axes, did I do right?
Now if I look at the degrees of freedom I only remain that of rotation, how do I block rotation?

Thank you.

the concentric solves at the same time axiality to planarity of 2 circular edges, therefore with only 1 constraint put everything in place, the distance would be redundant and is for what gives you error.
If you want to use the distance (because you really need it) then don't use the concentric but use the touch/align by selecting the hole and pin axis (pass on the cylindrical face and let him see the axis).
the rotation can not block it unless the pin has a planar face/edge on which to give at least one parallelism with something else, and however if it is not a pin that has to be oriented, to which to pro block it?

Bye.

 

[lelebianconero]

to block the rotation in this case I would create a datum plane in the pin, after which I would use parallelism in the assieme so much to the worst I have the terna of reference of the assieme itself as reference.
I agree with the question: what does it mean to block it?

 

[ceschi1959]

I agree with the question: what does it mean to block it?

I never found myself with constraint assemblies (with nx8 goes a little better) but there is, in my opinion, a basic problem: being the bidirectional ac, you can not understand whether some component is labile or not for internal or external conditions. so, even if it is not necessary from a functional point of view, I must also block the pins or screws.

 

[stef_design]

so, even if it is not necessary from a functional point of view, I must also block the pins or screws.

and if you change the position of a hole, the screw remains firm?!?
Hi.

 

[lelebianconero]

I'm sorry, obviously I didn't understand.
When you want to block the rotation, do you refer to that of the pin around your longitudinal axis?
because if so I don't understand what changes if this is at angle 0 rather than 147.
in case you still need to maintain a constant angle, I have always used the constraints with the datum plane playing from time to time with the reference sets of the individual parts.
I apologize if I understand it doesn't match what I asked

 

[beppino]

and if you change the position of a hole, the screw remains firm?!?
Hi.

No. the screw follows the hole.
we only talk about unbounded rotation.

I also do not understand the need to block rotation at a screw.

 

[avalon3d]

the screw, if free in rotation, will result "partially constrained", and can create confusion species on encoded components.

 

[ceschi1959]

the screw, if free in rotation, will result "partially constrained", and can create confusion species on encoded components.

thanks to. for the clarification, lately I do not understand if I am not explaining:redface: or if all the world does not understand me:tongue:
Maybe it's the age....

 

[matfio]

thanks to. for the clarification, lately I do not understand if I am not explaining:redface: or if all the world does not understand me:tongue:
Maybe it's the age....

I think it's the last, but it's just a matter of habit, you'll see when you start using new constraints and forget about old people, life will seem more beautiful to you: finger: but what avatar have you put lizards or geeks?

 

[nkt]

the screw, if free in rotation, will result "partially constrained", and can create confusion species on encoded components.

the exact purpose is to see if it is all bound or I forgot to enter some bond.

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