Spec Control Drawings

[gmarken]

Does do any of the companies for which you work still require you to make spec control drawings for purchased standard off the shelf cataloge items?

 

[MadMango]

Yes. Purchasing uses them as a specification in order to find different vendors in the all important task of cost reduction.

[green]"Art without engineering is dreaming; Engineering without art is calculating."[/green]
Steven K. Roberts, Technomad
Have you read faq731-376 to make the best use of Eng-Tips Forums?

 

[Heckler]

We create an Approved Vendor List (AVL) for all hardware. A components that are made for us we have a source control drawing (SCD) to capture the design intent. For example, Smalley makes a special crest-to-crest spring for us. They send us a a drawing with their part number and all the details and in turn we create a source control drawing. The source control drawings are not vendor specific so purchasing is free to get multiple bids.

Best Regards,

Heckler
Sr. Mechanical Engineer
SW2005 SP 5.0 & Pro/E 2001
Dell Precision 370
P4 3.6 GHz, 1GB RAM
XP Pro SP2.0
NVIDIA Quadro FX 1400
o
_`\(,_
(_)/ (_)

Never argue with an idiot. They'll bring you down to their level and beat you with experience every time.

 

[gmarken]

Heckler,
That makes sense. However would your company make an SCD for a purchased worm drive hose clamp?

 

[Heckler]

No, unless the company is making it specifically for us. We would create an AVL which would capture a least two vendors, their part numbers and any specifics about that part.

Best Regards,

Heckler
Sr. Mechanical Engineer
SW2005 SP 5.0 & Pro/E 2001
Dell Precision 370
P4 3.6 GHz, 1GB RAM
XP Pro SP2.0
NVIDIA Quadro FX 1400
o
_`\(,_
(_)/ (_)

Never argue with an idiot. They'll bring you down to their level and beat you with experience every time.

 

[gmarken]

How are you creating the AVL file? For our SCD's that we basically redraw the cataloge page in Autocad. In other companies for which I have worked we would photocopy or download the relevant pages and file them under our internal part numbers. So what I am asking is if anyone else actually transcribes the information into CAD as we do.

 

[Heckler]

For AVLs we just capture all part data and any product data sheets from the vendors then we create one pdf document that has our standard first page then followed up with anything we can get from the vendor. We usually model the items in SWx during the design process. That way we have the data for assembly drawings and other process drawings.

Best Regards,

Heckler
Sr. Mechanical Engineer
SW2005 SP 5.0 & Pro/E 2001
Dell Precision 370
P4 3.6 GHz, 1GB RAM
XP Pro SP2.0
NVIDIA Quadro FX 1400
o
_`\(,_
(_)/ (_)

Never argue with an idiot. They'll bring you down to their level and beat you with experience every time.

 

[MadMango]

Gmarken, for SCD's we do as you have outlined. What's driving you to ask this question? I think the process still holds value.

[green]"Art without engineering is dreaming; Engineering without art is calculating."[/green]
Steven K. Roberts, Technomad
Have you read faq731-376 to make the best use of Eng-Tips Forums?

 

[gmarken]

I just think that there are more efficient ways to copy the data rather than re-drawing and re-typing all the data into autocad. The SCD certainly has value. It is just this company's way of documenting it that could be improved.

 

[Tunalover]

The term Specification Control Drawing dissappeared with MIL-STD-100. The superceding drafting standard ASME Y14.100 invokes ASME Y14.24 TYPES AND APPLICATIONS OF ENGINEERING DRAWING which defines the Vendor Item Drawing (VID) rather than the SCD. This drawing does the same thing but under a different name! Sorry if I'm preaching to the choir!



Tunalover

 

[MikeHalloran]

As an aside, it's surprisingly inexpensive to get "special" worm drive hose clamps, with your name and part number, variant materials, different screws, stuff like that. I guess, because it's a competitive business, and everyone is already tooled up to make clones of each other's product line, in addition to MS parts.





Mike Halloran
Pembroke Pines, FL, USA