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GM ABSOLUTE 0,0,0

GM ABSOLUTE 0,0,0

GM ABSOLUTE 0,0,0

(OP)
I work for a tier 1 supplier to GM. I am being asked to start designing our components with the absolute 0,0,0 at a given point on our component. I have always designed our components in vehicle position. The way I look at this, if I follow this request when GM drops my component into Team Center it’s position will be at the front, center of the vehicle and will have to be repositioned.

My thinking is that they are asking for a saved WCS to be at this given position on my component, but it still should be designed IVP.

What do you guys think?

Thanks,
Dave

RE: GM ABSOLUTE 0,0,0

I think that they intend to use only assembly mates to locate the components, not the IVP.

RE: GM ABSOLUTE 0,0,0

GM will probably use NX's mating conditions to establish the position in relation to the vehicle.  I model wheels for GM and we've never been required to create our models IVP.

I would interpret what GM wants as modeling the part at absolute 0,0,0.  When your part goes into TcAE, there won't be a vehicle...it will just be your part/assembly by itself...GM will then add it as a component to the vehicle assembly later, if they desire.

Tim Flater
Senior Designer
Enkei America, Inc.
www.enkei.com

RE: GM ABSOLUTE 0,0,0

IVP has too many problems when it comes to shared components across car lines. What is IVP in one car may be off by a few thousnads to even feet in another car.
Putting each part at its own 0,0,0 forces the assemblies to use mating conditions for all components. We had that in our UG standards.

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

Ben Loosli
Sr IS Technologist
L-3 Communications

RE: GM ABSOLUTE 0,0,0

Looslib was correct in that it forces the use of mating conditions.  If parts are designed IVP, they simply have to be added to an assembly at absolute 0,0,0.  Now, when other mating parts are revised the placed parts are no longer IVP.  Many times the problem is not immediatly noticed and requires additional change orders to be written, costing time and money.  Worst case, the problem isn't caught and there are build issues.

In the past, GM designed all parts IVP and simply placed them at absolute 0,0,0 when adding them to an assembly.  This created a lot of rework on assemblies.  GM is trying to get the most out of it's assemblies and this is just another step in that direction.

Another reason is for part reuse.  A part can be used in any vehicle where it has application.  The Vehicle Assembly determines it's location.

I was involved in a lot of discussion regarding this topic during my 15 years at GM.  The end users have been reluctant to use mating conditions because the old way has worked for so long.  I believe that once they see the benefit of mating conditions they will have a change of heart.

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