What should appear on a drawing parts list?
What should appear on a drawing parts list?
(OP)
Okay I have another debate with the same manufacturing engineer. Originally on an assenbly drawing I had the ITEM, QTY, PART NUMBER, and DESCRIPTION columns on a assembly drawing.
Our manufacturing engineer created so called "BOM's" for himself, that had the P/N, REV, PART NAME, UNIT, QTY columns. Though I disagree with his choice of columns, I left it alone instead of getting into a fiery debate with him. Six months later we needed to place an order for more parts, but because neither his BOM's or my drawing list the material and vendor, it took me twice as long to order parts, because I had to review all my file to see where I order standard components from. This time I revised the assembly drawing and added the MATERIAL and VENDOR COLUMNS, to streamline, if additional assemblies needed to be order.
Needless to say the manufacturing engineer, said VENDOR AND MATERIAL colums don't belong on a assembly drawing! I looked up the ANSI standards, and they list them as optional columns. However, he still wants to have them removed, for reasons unknown. SO if I remove them, and someone else is going to purchase parts, there going to have a hell of a time knowing where to buy them from. What's everyones opinion on this?
Our manufacturing engineer created so called "BOM's" for himself, that had the P/N, REV, PART NAME, UNIT, QTY columns. Though I disagree with his choice of columns, I left it alone instead of getting into a fiery debate with him. Six months later we needed to place an order for more parts, but because neither his BOM's or my drawing list the material and vendor, it took me twice as long to order parts, because I had to review all my file to see where I order standard components from. This time I revised the assembly drawing and added the MATERIAL and VENDOR COLUMNS, to streamline, if additional assemblies needed to be order.
Needless to say the manufacturing engineer, said VENDOR AND MATERIAL colums don't belong on a assembly drawing! I looked up the ANSI standards, and they list them as optional columns. However, he still wants to have them removed, for reasons unknown. SO if I remove them, and someone else is going to purchase parts, there going to have a hell of a time knowing where to buy them from. What's everyones opinion on this?





RE: What should appear on a drawing parts list?
Cage code gives you full manufacturers details.
You put the manufacturers part number in as part of the description.
I'm inclined to err on the side of not liking seeing vendor & material columns but if the ANSI says it's ok who am I to argue.
We're having a similar dilemma but our Manf Eng want to see Vendow and part number. We haven't finalized how we'll do this.
Is the information of vendor/pn not in your MRP system or don't you have one?
RE: What should appear on a drawing parts list?
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RE: What should appear on a drawing parts list?
RE: What should appear on a drawing parts list?
RE: What should appear on a drawing parts list?
Tell the manufacturing engineer that these are engineering controlled drawings and if he wants to agrue, see your boss who has approved of the format.
"Wildfires are dangerous, hard to control, and economically catastrophic."
Ben Loosli
Sr IS Technologist
L-3 Communications
RE: What should appear on a drawing parts list?
RE: What should appear on a drawing parts list?
If you are going to put manufacturer's part numbers on your parts lists, you are going to have to identify the manfacturer, somehow.
The manufacturing engineer's determination to have the revision number on the parts list may indicate that he is a procedural twit, or it may show a lack of trust in your design/drafting office.
I am puzzled about your material column, but I do not understand your process. If the part is off-the-shelt, your order it from the vendor or manufacturer. If the part is described by a drawing, you pull the drawing out and work out what to do with it. Fabrication drawings should call up material. Adding this information to the parts list means you have it in two places, which usually is bad practise.
Our manufacturing engineer wants to see parts lists that identify everything with our company part numbers. This actually can be made to work, if we generate specification controls for each and every off-the-shelf part. The company part number would point to a document which tells us what the part is. We have MRP. We have not done this.
I have seen parts lists which used in-house stock codes to identify everything. The document explaining the stock codes was than locked up where nobody could get at it. There was much cursing by the engineers.
JHG
RE: What should appear on a drawing parts list?
RE: What should appear on a drawing parts list?
1 1 4000272 MIRROR
2 1 4000269 MIRROR GASKET
3 1 4000332 MIRROR COVER
4 2 4000624 SPRING ANCHOR
5 1 94045A515 CROSSED RECESSED
SHOULDER SCREW 18-8 S.S MCMASTER-CARR
6 1 E0240-031-0750S EXTENSION SPRING S.S ASSOC.SPRING INC.
This is a crude cut and paste of a parts list of one of my drawings. As you can see line items 1 thru 4 are detail drawings, so no information is needed on material (listed on detail drawings) or vendor columes. On line item 5 and 6 are the purchases parts, which the material and vendor colums are needed, mostly the vendor column is needed.
See the manufacturing eng doesn't want to show the vendor or material column. So if someone wants to purchase items from McMaster-Carr or Associated spring, as I have listed, and there's not a vendor column listed on the assembly drawing and the manufacturing engineer doesn't list it on there BOM's the job can't get done.
Its reasons like this people wounder why I act like I do...
RE: What should appear on a drawing parts list?
RE: What should appear on a drawing parts list?
I like your way of doing it in the notes. I don't think the way we do drawing notes in our CAD system would support it very well though, we'd have to cut and paste or something, which is why we're considering adding columns to the parts list even though I don't like the idea.
There seems to be an emphasis here on only entering the data once, ie in the Model and referring to that one source elsewhere, this is supported more easily by the parts list.
Londonderry, do you have similar constraints?
RE: What should appear on a drawing parts list?
Keep im mind its only me and another mechanical engineer, whos pretty cool. We lack alot of the support structure you typically find in mid- large companies. For examples, the two of us are designer, drafter, purchaser, and assembler (prototype only), and some times machinist ( when parts are goofed up)
RE: What should appear on a drawing parts list?
As far as CAGE codes are concerned, I'm not sure that they are required for every manufacturer, only those that do or plan to do business which is involved in any way with gov't procurement.
RE: What should appear on a drawing parts list?
http://www.bpn.gov/bincs/begin_search.asp
This website allows you to search for cage codes etc, it's not perfect as sometimes a company has more than one cage code due to mergers etc and it's difficult to work out which to use but it's pretty usefull.
Also if a supplier has a cage code they'll probably know it and let you have it.
RE: What should appear on a drawing parts list?
That said a lot of companies do have them, I don't think I've found one yet that doesn't (not to imply there aren't many that don't). The likes of Lee Springs and other catalogues like McMasterCarr tend to have them.
For any that don't you could add notes like ewh originally suggested, at least it will keep the number of notes to a minimum.
RE: What should appear on a drawing parts list?
Our parts lists contain
QTY | FIND NO. | P/N | DESCRIPTION | MATERIAL OR SPEC
We use a matrix for each configuration number so the quantity will be for each dash number, thus it's on the left. For assembly drawings, the find number is obvious (same as item number but I think the ASME spec recently changed it to "find no."). The part number is either our internal part number or the COTS number. The description is obvious. For assembly drawings, the material or spec column is used only for those COTS items. For part detail drawings, the find number gets an 'X' and the material or spec calls out the entire detail and optional materials, i.e. 7075-T6 Aluminum Alloy IAW ASTM B221 or 7075-T651 Aluminum Alloy IAW SAE AMS QQ-A-200/11.
Finish is called out in a flag note:
Heat treat IAW SAE AMS 2770
Finish 7.2.2 IAW MIL-STD-171, color brown 30045 to 30140 IAW FED-STD-595.
--Scott
For some pleasure reading, try FAQ731-376
RE: What should appear on a drawing parts list?
RE: What should appear on a drawing parts list?
Thanks for the link on CAGE codes, I passed this off to some people in our department.
We don't have the constraints as some larger companies, where more or less a startup biotech company, with little quality polices and the ones in place are not enforced much. So our design and drafting standards can fit to suit our needs so long as they stay within ANSI or ISO format.
One of the biggest problems, is I'm dealing with software engineers who don't have drafting experience or little or no experience with ANSI drafting standards. Its daily battle sometimes...
Some day I'll mention how they archieve drawings, you wouldn't believe me if I told you.
here check us out www.srubiosystems.com
cheers.
RE: What should appear on a drawing parts list?
I have used source controlled drawings in the past for the reasons I you mentioned. On the issue of vendor and material columns appearing on assembly drawing, I'm sticking to my guns. If the manufacturinf engineer wants them removed, then he better start learning drafting and Autodesk Inventor, or he'll be duing the purchasing on this project from now on.
RE: What should appear on a drawing parts list?
ITEM QTY PART NUMBER DESCRIPTION
1 1 4000272 MIRROR
2 1 4000269 MIRROR GASKET
3 1 4000332 MIRROR COVER
4 2 4000624 SPRING ANCHOR
5 1 94045A515 MCMASTER CROSSED RECESSED SHOULDER SCREW
Everyone recognizes a McMaster number so there is little confusion. The issue is that once in a great while McMaster will renumber their stock and suddenly 94045A515 is obsolete and cross-referenced to some rubber grommet, or worse they will suddenly have a number like above represent a package of 10,000 fasteners. Oops, I ordered qty 2...
In the larger company I am part of now, we assign our own P/N to every item and create a text drawing listing manufacturer and manufacturer part number for purchased stock items.
RE: What should appear on a drawing parts list?
Description would also include materials like solder, epoxies, etc. QTY for these would be AR (As Required).
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
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