WARNING-,I was using carr lane components 3

[fzvnpg]

and the threads will cause the view update (in drafting) to take from 30 sec to over 45 min. If i put the threads in with NX it doesn't effect it hardly at all.

Cj Silver
Senior Tooling Engineer
GKN Aerospace

Working to remember all I forgotten

 

[KENAT]

Yes, pulling in excessively complex models from various vendors can be a real performance hit to most CAD systems.

Threads are the obvious culprits but I've seen similar issues on some electrical components etc.

(Worst is an internal part though - someone modeled the mesh on on a vent shield for an electrical enclosure with HV present.)

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[Compositepro]

Your post makes no sense.

 

[MikeHalloran]

Actually, it makes perfect sense, as a complaint, not a question.

If you have tried to do a CAD model of a complex assembly by inserting CAD models that you download from third parties or component vendors, you will certainly have seen your expensive CAD system brought to its knees.

It's an artifact of people who don't know why CAD models are needed, contracting for the generation of CAD models. My first experience with it was on a Computervision system, where the Drafting Manager (Megalomaniac) asked me to generate models of standard screws. I did some grossly simplified things that looked OK if you didn't look too close. Said Megalomaniac found them unsatisfactory, so he engaged an Expert to do them anew. The Expert modeled the screws down to the slanted polygons within the Phillips recess. Of course, inserting even one of those models gave you time to get coffee between keystrokes, but the Megalomaniac was happy.



Mike Halloran
Pembroke Pines, FL, USA

 

[drawoh]

MikeHalloran,

Wait until you try out a printed circuit board model generated from the PCB data. 10,000 model objects, here we come!

--
JHG

 

[MikeHalloran]

I've already used Solidworks to build generator skids around engine models that included every damn split lockwasher. ... because the engine manufacturer doesn't know what cannot be left out when the packaging is tight and you're going to be adding filters and other accessories. Only the crankshaft and camshaft models were simplified.




Mike Halloran
Pembroke Pines, FL, USA

 

[MintJulep]

I've seen casting models with manufacturer's logo and name in raised figures included.

Then the model was sent to the FEA mesh generator and the "mesh me" button clicked.

Vendor can't figure out why the FEA has a billion elements.

 

[Compositepro]

I would hate to see many more posts here with the poor sentence structure like the OP.

 

[chicopee]

fzvnpq, are you downloading their block drawings from their website or from their CD's

 

[tbuelna]

Frankly, if your CAD people are too lazy to spend 10 or 20 minutes building a suitable model using the company's native CAD system, then you deserve all the grief you got by downloading a "free" CAD model. Hasn't your boss ever made it clear that you are being paid to do your job right, rather than doing your job with the minimum amount of effort?

 

[JohnRBaker]

Perhaps, but short of going out and actually purchasing an item, often it would be hard to get a good usable model only from a catalog or spec sheet. Besides, by definition, these are the items that you're NOT going to manufacture yourself but if you're responsible for the design of the overall product which your company is producing, that is an Assembly consisting of both in-house manufactured parts and purchased Components, having a readily available and ostensibly accurate model of the purchased items could prove to be invaluable from a packaging point of view.

The level of detail needed will of course be your choice depending on how critical it is to have an 'exact' model, but even if the only downloadable models available are 'overkill' in terms of unneeded detail, with most modern CAD systems (at least that's the case with the tools that I'm familiar with) these models can be easily simplified so that they still serve the desired purpose yet are not causing an undo burden on the system. I'd rather spend my "10 or 20 minutes" simplifying or 'defeaturing' something which I KNOW was the correct size and shape to start with then to spend that time (and perhaps a lot more) trying to hack together some crude approximation from pictures in a catalog. And once I've got BOTH the original, overly-detailed vendor model and my simplified version, if the need ever arose, I could at least temporarily swap-out my 'simplified' model with the fully detailed one to solve some unanticipated future packaging issue, again something that most all CAD systems should have no problems doing. And another thing, many people today are also using their CAD models for creating high-quality renderings of their final products. Again, it may be necessary to have fully-detailed examples of BOTH your own manufactured parts as well as the purchased Components, which could be readily swapped in and out of your production Assemblies so that these renderings can be as accurate and realistic as possible.

Anyway, that's my 2 cents worth (from someone who's been using these tools for over 35 years).

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:

To an Engineer, the glass is twice as big as it needs to be.

 

[3DDave]

I agree with the following quote from thuelna. My observation is that unless there is grief for the one who downloads, they continue. The real problem shows up in team assemblies, where those in charge of the subassemblies get credit for building their models so fast and it's the guy at the top assy who gets blamed for taking so long when these fat models get put together.

It's a matter of costs and incentives. If the boss doesn't know what it costs and put the correct incentives in place, then you know who gets the blame.


tbuelna (Aerospace)
13 Apr 13 3:22
Frankly, if your CAD people are too lazy to spend 10 or 20 minutes building a suitable model using the company's native CAD system, then you deserve all the grief you got by downloading a "free" CAD model. Hasn't your boss ever made it clear that you are being paid to do your job right, rather than doing your job with the minimum amount of effort?

 

[imcjoek]

Frankly, the 2d dimensional drawings most vendors offer are so pathetically devoid of actual dimensions that creating your own model is an exercise in frustration and wild guessing.

 

[jbeckhou]

45 mins to update a view? Maybe your computer needs an upgrade. I built assemblies with 1000's of parts, threads included, never had a 45 min view update. I would believe your computer would crash or stall with such a long period of time. What modeling software are you using? We use PRO-E, which is much better than solid works
. LOL.

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