Revision Control
Revision Control
(OP)
Question hoping someone can help me with.
I have an assembly. Say one component of the assembly I revised the drawing and added 1" length to it. This component is shown in the assembly drawing. Do I need to REVISE the assembly drawing OR just edit it and update that component to the correct length with out a revision since it does not affect form fit or function?
I've always revised every drawing no matter what, but a colleague disagrees. What would be the reasoning behind it?
Thanks
I have an assembly. Say one component of the assembly I revised the drawing and added 1" length to it. This component is shown in the assembly drawing. Do I need to REVISE the assembly drawing OR just edit it and update that component to the correct length with out a revision since it does not affect form fit or function?
I've always revised every drawing no matter what, but a colleague disagrees. What would be the reasoning behind it?
Thanks





RE: Revision Control
RE: Revision Control
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.
RE: Revision Control
If the one inch added to your component affects the form, fit and function of the assembly, do not revise the assembly. Save the results as a new assembly.
JHG
RE: Revision Control
You changed the length of a part, you changed its form.
NEVER change a drawing without changing the rev level. NEVER.
RE: Revision Control
thanks for the replies..
RE: Revision Control
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: Revision Control
We design vehicles with ~30k individual components, and assembly levels up to 50 deep. If we followed this rule to the letter, we would be revising the top-most numbers several times a day. With the high cost of changes (fielded vehicles, customer approval, etc.), we have business rules that limit us from going 'up the tree'. Our PDM makes sure we always have the latest versions loaded while we are working, and any time we revise an assembly, we 'catch-up' all of the view updates that have taken place. Obviously a component part number change must be reflected in an assembly immediately (or it didn't change, did it?).
RE: Revision Control
RE: Revision Control
Certainly I would think just changing it without going up a rev is incorrect in either case and would get you a slap on the wrist from configuration control.
Back when working 2D we'd only actually update the assembly drawing if you could see the difference in the views. ie a lot of the time if we just changed say a washer thickness or length of fastener or the material of a part then we wouldn't update the Assembly drawing itself. We would however update the separate parts list for hardware or the drawing list (which listed the revs of all the different drawings in the pack) for drawn items.
For parametric 3D depending how you have it set up you may not have a choice but to update it there and then or wait untill you have several changes and do it then relying on some kind of advance change control process till you get to incorporate it (as ewh).
I think others have covered this but from what I've seen/know usually revision is for a change not affecting form, fit, function etc. If these are changed and typically the part is no longer both forward and backward compatible then a new part number is normally given (sometimes a - number). In your case sounds like the piece part should be a new number but depending how your assembly goes together it may only be a rev. But looks like you realised this on your second post.
RE: Revision Control
If you are designing vehicles with 30K+ parts and a depth of fifty assembly levels, you need to follow the rules above.
The whole point of not changing form fit and function is that revisions do not affect subsequent levels of assembly. You can correct drawing errors, fix assembly problems, reduce cost and make things more reliable, and not affect the next parts list down.
When you do affect the assemblies further down the tree, the trickle effect stops when you hit an assembly whose form fit and function is not affected.
JHG
RE: Revision Control
A clean house is a sign of a broken computer.
RE: Revision Control
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: Revision Control
Jim Sykes, P.Eng, GDTP-S
Profile Services
CAD-Documentation-GD&T-Product Development
www.profileservices.ca
RE: Revision Control
Robert
RE: Revision Control
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: Revision Control
This is why revision and part number change control need to follow SOPs, the new (possibly) part that is an inch longer will have a different component part number than the original, the extra inch also affects the fit form function of the final assembly so this should take a new part number.
If a new part number is generated than a new BoM for that assembly part number would also be generated, thus calling for the correct component (1 inch longer).
As stated by ewh, you can use temporary documentation (ECN ECO deviation etc) to attach to the original BoM, this tells planning etc to call for the new component.
A clean house is a sign of a broken computer.