Edge Blend Update

[Krish1506]

I would request Mr.John Baker to answer this question, since I haven´t received any replies in the same post posted previously. Following is the post as below:

Me and my colleague are working on powertrain components for Mercedes Benz since we are the supplier . We have designed a bumper model in NX which has a lot of edge blends. Based on FEM results it needs to be modified bascially we Need to re-postion some ribs again. The Moment it is re-positioned comes the error edge blend. It's pretty clear that nearby edges needs to be modified since some edges are missing but apparently in this case we need to modify all the edge blends because while designing tangent curves was taken into account. There are some 1500 edge blends which we Need to modify step by step. There should be definitely some tips or tricks to work on edge blend with NX because every single edge blend modification consumes a lot of time. Thanks in advance for your comments and Feedback.

Greetings from Germany!

 

[Toost]

It is more or less impossible to give any tips without seeing some example . of course your bumper is highly classified and cannot be uploaded, but maybe you can create a simple demonstration example and show the problem ? - But, Have you tried the direct modeling features ? ( Move face etc) They all have the character that they modify the geometry without touching the previous features, they add a new feature at the end and the previous blend features should not be forced to update.
This might be a question which is solved better by the German support organisation, where you can work on the real model, rather than this open forum.


Regards,
Tomas

 

[JohnRBaker]

Note that I've been retired from Siemens PLM since January and while I still follow this thread, I'm no longer in a position to respond to specific 'how-to' questions since I do not have access to the NX software. For the record, when I retired, I neither asked for nor was I offered a copy of the software.

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

 

[Toost]

Dear John, isn't there charity organisations who can help us provide you with a seat of NX ? ( yes, Joke.)
Your aid here is excellent !

Regards,
Tomas

 

[JohnRBaker]

Trust me, I could have gotten a free copy if I has wanted. Heck, I'd been signing for one person's free copy for years and the guy who's now covering that situation would have gladly sponsored me as well, but I wanted to make as clean a break as I could. After 50 years of not being without a job a single day, I wanted to know what it would be like to be totally free of any obligation, real or imagined.

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

 

[Krish1506]

Thanks John and Tomas for the reply. I would try to get in contact with GTAC Germany.

 

[wojteksnk07]

Hi Krish, I'm working with NX since 3 years (before 13 years, and naw Catia V5), and have the same issue.
Working now on sealing systems, moulding etc. in NX it's disaster!!!. I have model with 3000 steps and after update, need to spend hole day to fix all fillets and missing features...
Compare all time to Catia, Nx is faster but it is not parametric system...

Cheers
Wojtek

 

[Krish1506]

Exactly it consumes a lot of time and effort Mr. Wojtek. Hope NX implements some new user function in future to make it parametric as CATIA.

Cheers,
Krish

 

[Toost]

If i read your first post again, you speak about tangent curves "designing tangent curves was taken into account."
Did you use the selection intent rules when you applied the blends or did you use "single curve" as selection method ?
- This is the reason why the selection intent was implemented.
I have supported NX for quite a few years and this sounds as if there was some poor methods built into this model, rather than NX being "non parametric".

Regards,
Tomas

 

[Krish1506]

I had opted for Tangent curves while designing since there are several edges in my geometry. If I would have taken single curves then it would have been more than 4500 time steps. I currently have 3000 time steps in the model. The reason for opting Tangent curves was to reduce the time steps so that update gets faster. I do Support NX compared to CATIA because it´s much more user friendly due to its synchronous modelling technique and graphic interference . If you read my first post I had mentioned there must be some tips and tricks to work on edge blend which I am looking for. We had a contact with GTAC and I am looking for a positive Feedback from them. I would also keep in mind of opting for single curves while designing the future part.

 

[Xwheelguy]

Without being able to get our hands on the exact model or something close to it, everyone responding is more than likely going to be giving their best guesses.

There are going to be times when you adjust adjacent geometry and an Edge Blend fails to completely update - NO MATTER WHAT CAD SOFTWARE YOU USE. Just because an Edge Blend doesn't update does NOT mean a model isn't parametric - that's absurd. The features and parameters DO NOT disappear (check your list of Expressions if you doubt me) and the model doesn't revert into a dumb solid. The supporting geometry has been changed to the point that the blend requires the user to redefine the blend, simple as that.

I have no idea what "time steps" are, but if that's the number of Edge Blend features you have in a model, I'd be looking into a new modeling workflow.

Is the bumper symmetric at any point? If so, did you bother to Mirror it to possibly halve your work or at least significantly reduce it?

Tim Flater
NX Designer
NX 9.0.3.4 Win7 Enterprise x64 SP1
Intel Core i7 2.5GHz 16GB RAM
4GB NVIDIA Quadro K3100M

 

[Rob_N]

Without access to the model and based on your description of just a couple of ribs need to be moved. I would look at synchronous modeling.
remove the ribs that need to be moved and remake them.