ASME Part's list standard
ASME Part's list standard
(OP)
I am trying to find the ASME Y standard that governs replacing find numbers vs not replacing find numbers. I have found very open standards in global that basically state when you are changing fit, form, or function then you need a new find number on your parts list. How about when you are just changing a screw length? You just change the part no. and nomenclature then roll the rev on your drawing.
Does anyone know the ASME standard that states this?
Thanks
Does anyone know the ASME standard that states this?
Thanks





RE: ASME Part's list standard
ASME Y14.100 probably gives the most explicit explanation of when a new part number is assigned rather than a new revision. I have the 2004 standard in which 6.8.1 is the relevant section.
My summarized version is if the part after the change is completely interchangeable with the old part (think the 2 parts could be put in a bin and either used), then it's a rev change. Otherwise, it's a new PN, however, due to the effort sometimes required in changing part numbers many places do not follow this to the letter all the time.
New PN may be required not just by physical interoparability but by being able to trace parts/when a change was cut in. For instance, say a treatment was changed from Cadmium to say Zinc for environmental or health & safety reasons. While the parts are still physically interchangeable, it may be necessary to be able to tell them apart for other reasons.
I have previously posted exerpts from this section, if not in this forum then over on forum781: -Engineering Configuration Management.
Form, fit & function gets trotted out all the time but is not the whole story.
KENAT,
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RE: ASME Part's list standard
Say you have block (find no 1) being screwed to base (find no 2) by screw (find no 3).
The screw changes from .5" to 1", but is still a 1/4 screw/bolt.
Do you make it find no 4, and put deleted in the nomenclature of what was find no 3? Or do you just replace the part no/nomenclature of find no 3 to reflect this change and roll the rev of the drawing (and the final or top level assembly)?
RE: ASME Part's list standard
Non mandatory D8 in Y14.100 talks about find no's but I'm not sure it's explicit on your subject.
Y14.34m-1996 has a little at section 4.5 and refers to Y14.35M-1997 which again doesn't have as much as you might hope.
KENAT,
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RE: ASME Part's list standard
RE: ASME Part's list standard
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: ASME Part's list standard
The problem comes in when business needs push you in a direction to ignore the rule just to keep the flow of whatever flowing.
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group
RE: ASME Part's list standard
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: ASME Part's list standard
In your case only the parts list is being revised.
Per ASME Y14.100: Items to be deleted shall retain the same Find number. The nomenclature shall be erased and the word "DELETED" inserted in the nomenclature or description column. When using digital data techniques, items deleted shall be omitted on the next list run or the word "DELETED" may be inserted in the nomenclature or description column.
...and no you do not roll the rev on the next or final assy.
Jorge
RE: ASME Part's list standard
Thanks.
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: ASME Part's list standard
ASME Y14.100-2004, APPENDIX D-13 "CHANGE REQUIRING NEW IDENTIFICATION" AND SECTION 6.8 "ITEM IDENTIFICATION"
ASME Y14.35M "Revision of Engineering Drawings and Associated Documents". SECTION 8 "ASSOCIATED DOCUMENT REVISIONS"
10th ed. DRAWING REQUIREMENTS MANUAL SECTION 23.23.5 "Deleting Items. Items to be deleted shall retain the same Find number. The nomenclature shall be
erased and the word "DELETED" inserted in the nomenclature or description column. When using digital data
techniques, items deleted shall be omitted on the next list run or the word "DELETED" may be inserted in the
nomenclature or description column."
Hope this helps,
Jorge
RE: ASME Part's list standard
Obviously the DRM is more detailed but it's not an industry standard as such.
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: ASME Part's list standard
MIL-STD-100E SECTION 704.5 "DELETING ITEMS" has the same wording as the DRM. As you know MIL-STD-100E was superceded by ASME Y14.100, Y14.24, Y14.34M AND Y14.35M.
I think ASME Y14.35M SECTION 8 will have this same wording...unfortunately our copy at my job is missing this section...grrrrrr. I'll follow up when I get more info.
Jorge
RE: ASME Part's list standard
Chris
SolidWorks 08, CATIA V5
ctopher's home (updated Aug 5, 2008)
ctopher's blog
SolidWorks Legion
RE: ASME Part's list standard
Section 4.1 talks about Deleting or Crossing out but only generally, not specifically about lists or whether find numbers can be re-used.
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: ASME Part's list standard
Think hard before you implement this.
In SolidWorks, you can maintain item (find) numbers, and you can even cross items when the quantity reaches zero. When I tested this on a much earlier version, it was not reliable. I found it much safer to stick with item numbers that follow order of assembly. I never refer to item numbers in notes. SolidWorks always matches item numbers to the current parts list.
If they have fixed SolidWorksk now, or you are using a different 3D CAD package where this feature works, you can still have problems.
The drawing is at revision D. The assembly view sucks; nobody can make sense of it. In SolidWorks, I open the assembly model. I delete the assembly view. I rotate the asssembly model and re-create the exploded views. I generate a new view. Your modified parts list now is a replaced parts lists. In another scenario, your parts list gets corrupted, and you have to delete it and generate a new one.
In yet another scenario, you create a drawing and maintain the item numbers on the part list. The CAD software is upgraded with a completely new parts list program. You cannot switch over without blowing away your item numbers.
If you change form, fit and/or function, you generate a new part number.
RE: ASME Part's list standard
In general practice it has been common to ignore the Revisions block for any detailed changes and to mention the Rev letter and reference there the EO or ECO number where the change is documented.
This means they will document everything in a separate document called an Engineering Order (EO) or Engineering Change Order (ECO).
If the change is to be a simple one, such as a screw length then it's just changed in the parts list and documented on the ECO with "IS/WAS" comments. Generally because it's a part not made by them.
If it is an engineering change to their part, such as a dimension between holes, then it is often shown in the parts list as "Deleted" and a new item number is added with the deletion and addition documented on the ECO and the change made on all locations of the drawing. If it's generated from a solid model (Catia, SolidWorks, Autocad) then the solid needs to be changed and the views updated.
But the original question, I believe, was whether that part number or item number can be reused once deleted. I've seen it both ways but it has become a standard practice at some companies to leave the number as "DELETED" for one revision letter change but then reuse it again after that. This way the documentation of the deletion remains in the system.
Frank Reid
RE: ASME Part's list standard
RE: ASME Part's list standard
RE: ASME Part's list standard
It is "find number".
Page 21: ht
thread1103-163911: What should appear on a drawing parts list?
Chris
SolidWorks 09, CATIA V5
ctopher's home
SolidWorks Legion
RE: ASME Part's list standard
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group