Assembly Constrains management...….. 3

[CAD2015]

Hello,

I work in a team of 10 Catia designers.
I had to review some of their previous tasks.
All of them use in Assembly files the Fix constrain for all components!
It is something unusual for me; I always place a fix constrain for the most important component and use that component as a reference for all the other appropriate constrains.
Why are they doing that? Save time?
Am I wrong?...…


Thank you!

CAD 2015

 

[ferdo]

It was a time when I worked in a project for AIRBUS. we did exactly what you described but in the end we delete all those constraints and replace them with fixes (that was the procedure imposed).

Can you imagine what kind of workstation do you need to have to work with assemblies with (maybe) thousands of constraints?

Or how difficult it would be to manage modifications in huge assemblies (think at an aircraft fuselage)?

Regards
Fernando

https://www.youtube.com/playlist?list=PL9mSHa4SOedV3dr0D3kfIWFUg7mIYm94k

https://www.youtube.com/playlist?list=PL9mSHa4SOedVUEkEojiX_kdzpe0sDbaz2

 

[CAD2015]

Thank you, Fernando!

CAD 2015

 

[LucasC]

It isn't that hard to maintain constraints. you can group them in sets just like geometry in geo-sets. The risk with fixing everything is that if a component size changes, now its out of position in the assembly which can cascade through its surrounding components.

 

[ferdo]

Agree, but that's why you have rules and methods established by each company, according to their design concept and needs.

Regards
Fernando

https://www.youtube.com/playlist?list=PL9mSHa4SOedV3dr0D3kfIWFUg7mIYm94k

https://www.youtube.com/playlist?list=PL9mSHa4SOedVUEkEojiX_kdzpe0sDbaz2

 

[jackk]

I've heard of some companies that use SNAP to position parts and then FIX to lock them in place.

Not what I would do, but it is another method.

 

[CAD2015]

Thanks, Jackk.


CAD 2015