Current state of Model Based Definition 1

[KENAT]

There have been several threads both here and in other forums on use of MBD (Model Based Dimensioning). When I'd previously looked at it I'd decided it would be more effort than it would be worth for most of our stuff, however, have implemented it on some castings and moldings.

We're being pushed to decrease development time cycles and my boss wants to look at MBD as a way of achieving this.

So how many people are doing MBD and have any major developments in this field come along since it was last discussed in depth?

I'm especially interested in those out side of the 'managed supply chain' of Aerospace/Defense and Automotive where it seems to have been achieved largely by the OEM's dictating what CAD system will be used and using their leverage to enforce this on their suppliers.

We are a smaller/independent player in the technology field who outsource all our machining etc. with only assembly done in house (even some of this is outsourced) and I'm wondering how other smaller players have dealt with it. Do you:

1. Only deal with suppliers with the same (or at least compatible) CAD/CAM system(s) so that tolerances etc. in the model are carried across?
2. Use a lightweight format and does it correctly handle MBD.?
3. Use hybrid drawing/model and if so how do you handle Tolerancing of features not explicitly defined on the drawing?
4. Have extensive "rules of use" in addition to/in place of the above or just rely on ASME Y14.41 or equivalent?

I have a copy of 14.41 and looked through it a while back but I’m not completely familiar with it.

thread1103-182896
thread730-184173
thread1103-182500
thread730-221206

Are all more or less relevant.

Thanks.



KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:

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

 

[KENAT]

I wasn't in on the call. They don't just do machining, they have some design capablilities and use a bunch of different software and claimed inventor was the only one that really pulls the data through. I was surprised and not having been in on the call still have my doubts.

KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:

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

 

[fcsuper]

Considering that there are CAM packages embedded into SolidWorks that use SolidWorks files natively, I would want to ask for an explantion about what they mean by " pulls the data through". If you are using the application on native files natively within the editing software, there's nothing to "pull though" because its already there.

Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group

 

[ewh]

I was wondering that, too. It's one thing attempting to pull the data through from a differing CAD system, but quite different when using the same system for design, machining and inspection.

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

 

[KENAT]

Yeah, I'd have thought if you were using an embedded or equivalent CAM package, it would pull through the data. Like I said I wasn't on the call.

I think the phone call told my boss enough that he sees that with current technology and our place in the supply chain etc. hybrid model & drawing is probably as far as we can reasonably go.

It's just my ego that smarts from him not accepting it from me when we first spoke about it.

KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:

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