Industry standard

[doc1955]

I was told today that what we are doing is not what most companies are doing when it come to models being used by the NC group. We have always tried to stay with a master model concept. We design a fixture and add the manufacturing part as a component. The the NC group create their NC file and add the fixture as a component to their file.
Well today we were told that we should be using a linked body to program against that way we could add features to the part as we need to. I personally think this is a bunch of none sense as that would remove all control we have over manufacturing parts and have no rev control. Am I missing something if I'm wrong I'd like to know. The way I see it is how do you control the product you are putting out if any NC programmer can change what they are programming against.



Doc

http://www.goodrich.com

 

[JohnRBaker]

Generally speaking, the idea of using a WAVE Linked or Promoted model as part of a manufacturing process is usually related to when designing and machining castings and forging. In that case it's not really the NC Master Model where this would occur but rather as part of either the product design or the manufacturing process group, the people who are making the decisions about what secondary/tertiary modeling operations may need to be performed to create the necessary intermediate models, but this process should be treated no different than the modeling of the finished product. That is, each one of these intermediate models would be added as a Component to their specific NC Master Model assembly, along with the relevant fixturing, no different than if you were manufacturing the finished model directly.

Anyway, I hope that helps assure you that you ARE following the recommended workflow.

John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

http://www.plmworld.com/museum/

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

 

[looslib]

The only thing I would do differently is for the NC model.
Tool design may build a multi-part fixture for the NC operations.
They bring in the components and design the fixture around them.
When it goes to NC, bring in just the fixture and then the model.

Our structure looks liek this:
1) NC machining file
2) NC fixture
3) Component being machined

My structure looks like this:
1) NC machining file
2) NC fixture
3) Component being machined

Only a slight difference, but can have benefits depending on your company's structure.



"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli

 

[doc1955]

That is what I suspected. To me it looks like some one wants some one else to do a job that they should be taking care of and be responsible for.

Thanks John!


Ben that is looks like your structure the part is residing with in the fixture assembly.

Thanks Ben!

Doc

http://www.goodrich.com

 

[ewh]

I agree that your workflow is a good one.
You should probably make management aware however that if the NC group is allowed to create their own models, to meet data control requirements of the prime manufacturers those files MUST be controlled, and any/all changes made to them have to be recorded in a data control system. This means that the operator can't just make casual changes to the file without leaving some sort of recorded, auditable trail of what was done.
If you don't do or plan to do any business with any of the primes, your management may overrule "good practice" for the sake of expediency.
Been there, done that, got the headache.

"Good to know you got shoes to wear when you find the floor." - [small]Robert Hunter[/small]

 

[doc1955]

If you don't do or plan to do any business with any of the primes, your management may overrule "good practice" for the sake of expediency.
Been there, done that, got the headache. [\i]


EWH,
I hate to say it but that is a all to common practice here. Working on files using part models that have not been verified or released. Then wonder what went wrong when a year from now we need to add a revision or change the machine it was on, and everything falls apart. I swear some of these jokers need to pull their head out of you know where and see the day light once and a while!


Doc

http://www.goodrich.com