drawing rev varies, sheet by sheet

[Tmoose]

A big military contractor is supplying us a lube oil skid.

The 12 page drawing they have supplied has REV I (eye) in the corner of the title block on page (1), but other pages are REV H and J. Each page has its own rev history block, and the block on each page matches the rev letter in the title block.

No one denies it is confusing as heck, especially since page one offers no clue that other pages have higher revs. Is there any precedence for this?

 

[ewh]

Are all of the sheets at the same revision, just denoting what revisions occured on each sheet?
"I" should not be used as a revision.

 

[MintJulep]

I've seen rev by sheet before. As long as everyone understands I don't see a big problem with it.

The alternative is to revise 11 out of 12 pages with the only change being the revision letter when something changes on only one page. This wastes big money if you need design review of all revs and have controlled documentation distribution.

 

[ctopher]

It is standard practice for military dwgs. But, "I" should not be used, they know it.
Also, when revs are different on each sheet, there is suppose to be a table on the first sheet listing each sheets rev.

Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 05
ctopher's home site (updated 06-21-05)
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[Heckler]

I agree with Chris. I saw this all the time at the Big L and yes the first sheet should denote the different rev'd sheets.

Best Regards,

Heckler
Sr. Mechanical Engineer
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[wgchere]

I agree with ctopher and Heckler, Except the first sheet is always at the latest revision because it will always change with each revision (the revision table on sheet one has to be updated every time).

Rev "I"??? What a rookie mistake!

 

[3dlogix]

Don't feel bad, I have to put up with a "boss" who thinks that "I" and "O" are acceptable rev's.

Yikes!! Or should I say Yjkes!!

http://www.sprdesign.com

http://www.3dlogix.com

 

[CorBlimeyLimey]

I have never worked for a compnay which has not had a "rev-by-sheet" system. None of them had a sheet 1 index, but one did have a seperate Rev sheet which detailed the changes & only the title blocks rev number changed. None of them were military.

The last company I worked for was building a machine for a company which used the "all-sheets-the-same-rev" system. The drawing package consisted of 60+ A0 sheets. I was receiving a set of revised drawings weekly for about 2 months. In most cases only a few parts were affected but the whole set had to be updated, printed & sent. I have never seen such a stupid, wasteful system.


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[ctopher]

My last job did both ways as CBL described. The correct way is to have a rev table on the first sht showing all sheet revs, and a rev block at top-right corner showing doc rev.

Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 06
ctopher's home site (updated 06-21-05)
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[11echo]

Hmmm, in my neck of the woods different Rev. number per sheet is common. The ONLY time a package goes out with the some rev. number is Rev. "0"(zero) "Issued for construction". Then each sheet becomes a separate entity and only when something changes on that sheet is the rev. number changed. Why bother to change multiple sheet Rev.s if no change on the drawing occurred? Seems to be a waste of time, money and effort!!? But I'm only looking at it thru a Piping discipline. The only time "we" have alphabetical Rev.s are "in-house"(pre-issue for construction) and only numerical Rev.s after Rev. 0 issued for construction. AND we don’t use Rev. “I or O” either.

"IF good work is not recognized, poor work will follow"!

 

[ctopher]

Using rev 0 is the same as using rev O, you don't use it.
Having a rev on each sheet is OK, just list them on a table on the first sheet. You don't change the rev if nothing changes on the dwg. All dwg's revs should match the revs of dwgs that are either in-house or go out. This is the same for ALL disciplines.

Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 06
ctopher's home site (updated 06-21-05)
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[ewh]

I have never worked for a company which used a "rev by sheet" system. The largest drawings would be in the order of 10 sheets (either manual or CAD), and they were few and far between. All of the CAD drawings (with the same part number) that I have worked on have been in one file, and that file reflects the revision level.
Just goes to show that there are several legitimate ways to accomplish the same thing.

 

[ctopher]

I have done the same. But, for military controlled projects, they require revs per sheet.

Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 06
ctopher's home site (updated 06-21-05)
FAQ559-1100
FAQ559-716

 

[ewh]

I have worked on military programs subject to MIL-STD-100, but we still revised the entire drawing at one time. Granted, this was at a sub-contractor company, not directly with the military.

 

[aardvarkdw]

If you are using a program like Inventor it is real easy to have every sheet rev at the same time because the program does it for you!

 

[CorBlimeyLimey]

aardvarkdw ... Likewise with SolidWorks & most other CAD programs. It's the ideology of sheet/part revisioning, not the ease or difficulty of implemennting it, that's being discussed here.


Helpful SW websites FAQ559-520
How to get answers to your SW questions FAQ559-1091

 

[drawoh]

aardvarkdw,

If you are using SolidWorks or Inventor and you are keeping separate revision numbers for each sheet, it is dead easy to revise stuff without documenting the fact. Even if you have separate drawing files attached to the same CAD models, you have a potential screw-up.

Your policy on sheet revisions must be based to some extent on your CAD management and your level of trust in the people who will get write access to the files.

JHG

 

[sean01]

I've seen a number of companies use rev by sheet - I don't see a huge issue with this. Ultimately if you are providing a service to an existing company - its easy to have an opinion - but if they're buying - they should get what they want.

More important to me is the document control system which should put the right info in the right place at the right time...

As for the method I use - very lazy I'm afraid - drawing issue, number of sheets etc - In all cases - 'refer to sheet 1'

sean

 

[aardvarkdw]

CBL,

Too true, I should have given a better explanation.

In the company I currently work for our doc control system uses PDF format to store our .idw's. By doing things this way it makes the most sense to release all pages of our drawings in a single file. Because our templates automaticly update the rev to match page one it makes the most sense to rev the whole drawing at the same time. If I was using autocad and had multiple sheets by all means I would have a rev table on the first sheet and only rev the first sheet and only the others that needed changing. I am a firm believer in doing only as much to a released drawing as is nessesary to fix any problems.

I don't know of any standard for this. I believe that it is entirely up to the company that produces the drawing. I do know that I have seen it done both ways and I would have no problem with either way as long as the information and intention is CLEARLY shown.

 

[ctopher]

aardvarkdw,
There are standards for this. It is not up to companies to do however they like, although most do anyway.
Companies that do design work should all have copies of the MIL, DOD, ASME & ANSI standards ... and follow them.

Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 06
ctopher's home site (updated 06-21-05)
FAQ559-1100
FAQ559-716