Identifying DoD Level 1, 2, or 3 on Drawing Face
Identifying DoD Level 1, 2, or 3 on Drawing Face
(OP)
We used to identify the design maturity level based on part number. Now, we are eliminating that business process and will be maintaining the same part number throughout the entire development cycle. Therefore, we would like a method to identify the Design Maturity on the face of the drawing.
After several internet search iterations, I haven't found a good example. I have my own idea, but I'd like to compare it to, or borrow from, existing examples. Does anyone have a good drafting standard (title block or template) to identify design maturity level on the face of a drawing?
Thanks,
After several internet search iterations, I haven't found a good example. I have my own idea, but I'd like to compare it to, or borrow from, existing examples. Does anyone have a good drafting standard (title block or template) to identify design maturity level on the face of a drawing?
Thanks,
--Scott
www.wertel.pro





RE: Identifying DoD Level 1, 2, or 3 on Drawing Face
Former UK defense company. When the drawings were under our control we kept them at alphabet revisions - even at this stage though they were under a fairly robust internal drawing control system. Once the govt had approved the design and it was effectively locked down we in theory changed to numeric revisions. In practice the govt was getting less & less keep on paying for rev changes of all drawings in pack so often they only went to '1' if there was something else driving a revision.
Now in the US commercial we use numeric revs for prototypes, moving to rev A at formal release. While at numeric values there is virtually no formal drawing control, basically up to the individual draftsman/engineer to keep track.
Not sure if that helps any. I think vaguely similar has been discussed before but I forget on which forum.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Identifying DoD Level 1, 2, or 3 on Drawing Face
Thus, I now have to put a I, II, or III somewhere on the face of the drawing. I'm thinking just a small block in the upper left near our Proprietary statement and ITAR/EAR note.
--Scott
www.wertel.pro
RE: Identifying DoD Level 1, 2, or 3 on Drawing Face
I have never been to a company that has used I, II, or III on a drawing.
I work at a large company. A newbie here tried to implement it, was shot down. It's not understood by anyone here, or any of our customers or suppliers.
Chris, CSWA
SolidWorks 14
ctopher's home
SolidWorks Legion
RE: Identifying DoD Level 1, 2, or 3 on Drawing Face
Now that I'm back in the manufacturing world, it is flipped. We do a rev "-" (dash) for initial release (which irks me) and numbers for preliminary design stages, and letters for post-release revisions. Before I got here, there was little-to-no control over preliminary revisions. Since letters were used for revisions post-release, numbers was my only option.
I very much like the two-stage revision standard of numbers/letters.
_________________________________________
NX8.0, Solidworks 2014, AutoCAD LT, Autocad Plant 3D 2013, Enovia DMUv5
RE: Identifying DoD Level 1, 2, or 3 on Drawing Face
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: Identifying DoD Level 1, 2, or 3 on Drawing Face
The only purpose the description had before was to tell how much drafting effort remained / should be paid for. Level 3 drawings were typically redrawn by drafting onto a durable, reproducible material like mylar or (older) linen using durable, non-smudging plastic lead or ink. Level 2 was usually pencil on vellum by engineers or designers and level 1 was paper or cocktail napkins or something.
I guess no one needed to mark the drawings as two things made its state obvious - was it drawn on a durable material and was it signed off.
RE: Identifying DoD Level 1, 2, or 3 on Drawing Face
And the difference has continued to evolve on the same premise, but includes more than the level of detail of the drawing. It includes approval processes and affects on other downstream departments.
I. Conceptual A conceptual drawing is a sketch, on a napkin or otherwise, even CAD, but doesn't require full definition and only the person creating the sketch approves/releases it. It is used to convey a concept or for a proposal. There is no checking or other reviews performed on the design.
II. Development A developmental design is a step above that. It has been detailed out, but maybe not a tolerance analysis performed. It has been reviewed by at least a checker and probably has some input from the integrated program team to verify sources, manufacturability, preliminary quality control plans, etc. Some details may be left TBD until testing or qualification is performed to fully define the design. Things like material specifications, final tolerances, and other general notes may not be complete.
III. Production A production design is a the final step. All the i's are dotted and t's crossed. The entire IPT has to review and sign off before it is released. There are no gaps in the design left to the imagination.
The reasoning behind showing a I, II, or III (or a C, D, or P) on the drawing when there are no other human readable identifiers on the drawing (such as part number or revision) is to know the level of rigor applied to release the drawing. We don't want a Production Planner pulling a concept-level design and having Supply Chain order hard tooling and 100,000 parts. We also don't want an engineer using a concept level component on a production level assembly and assume it has been checked and validated when in actuality it has not been. That could be dangerous with deadly consequences.
--Scott
www.wertel.pro
RE: Identifying DoD Level 1, 2, or 3 on Drawing Face
RE: Identifying DoD Level 1, 2, or 3 on Drawing Face
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV