(DOC) Engineering drawing abbreviations and symbols | Edvaldo Souza – replace.me

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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Mechanical and Metal Trades Handbook. ASME Y Engineering drawing abbreviations and symbols From Wikipedia, the free encyclopedia Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing.

AF Commonly used when measuring the flat surfaces across flats of a hex drive, such as a hex nut. AN- A prefix for standard hardware catalog hardware ID numbers. Came from the era of circa s- , when the U.

Army and Navywere leading the way on product standardization for logistics improvement, yielding the United States Military Army-Navy Standards system.

Today industry and ISO also do a lot of this standardization specification, freeing the U. It is trivial to say that no one wants any error, and that everyone wants uniform perfection; but in the real world, it almost never acceptable quality level happens.

The intelligence behind defining AQLs is in figuring out how much error is tolerable given the costs that would be incurred by any efforts to further reduce its incidence. For as required example, in an assembly with a bolted joint using four bolts, the PL quantity column will say “4” for the bolt PN, “4” for the nut PN, and “AR” for the liquid threadlocker that will be applied. AS Aerospace 1. Aerospace Standards, technical Standards;Australian standards maintained by SAE International and Standards widely used in the aerospace manufacturingindustries.

Australian Standards, standards perAustralian industry. The list of such supplier, approved companies which usually changes over time is vendor, approved- called an APSL, AVL, or similar names. Vetting the product-supplier list, companies on this list requires approved-vendor list the CDA to audit and possibly periodically re- audit the companies, which incurs an overhead expense for the CDA.

Therefore, smaller companies will often cite larger companies’ lists in order to avoid the cost of duplicating the effort. It does not serve as an acceptance criterion. It is thus similar in some respects to a reference dimension.

A common and simple example is hole location: If a hole’s centerpoint location has a position tolerance, then the centerpoint’s coordinates do not need and should not have separate tolerances applied to them. Thus they are instead given as basic dimensions. In modern practice basic dimensions have a rectangular box around them, or sometimes the word “BASIC”. BC or B. The same CAGE code can change owners over the years. For example, a CAGE code that formerly referred to a certain Martin Marietta site will now refer to Lockheed Martin at that same site although the buildings may have been replaced and the signage may say different names.

CBN cubic boron nitride A material from which some cutter inserts are made. CDA The CDA is the entity whether it be a corporation, a unit of a national military or ministry of defence, or another civilian government agency that currently has design authority over the part design definition.

Better to cast iron spell out for clarity. Center line, the central axis of a feature. The latter practice is not uncommon but iscryptic for workers with minimal training and experience. The first two options are better practice. This strict version of radius definition is specified in demanding applications when the form of the radius must be controlled more strictly than “just falling within the dimensional tolerance zone”.

It is poor engineering to specify a CR instead of an R simply controlled radius on the theory of enforcing good workmanship. CR is for critical features whose performance truly requires near-perfect geometry. Like most such characteristics, its presence increases the price of the part, because it raises the costs of manufacturing and quality assurance.

CRES Largely synonymous with stainless steel, unless corrosion-resistant specific grades, specs, and distinctions are made on [steel] the drawing. Some people treat CRES as a subset of the stainless steels. CRS cold rolled steel; on Defines centre-to-centre distance of two features, centres such as two holes. For delta usage, see for example “delta notes”.

DIA[2] Diameter of a circle. DIM dimension, dimensioning DO, do Seen occasionally in older drawings instead of ditto repeating a given dimension. See also REV. Soon this evolved into the “check mark” sign with accompanying number that tells the reader a max roughness value RMS, microinches or micrometres for the machined finish, to be measured with a profilometer. FAO finish all over A note telling the manufacturer that all surfaces of the part are to be machined as opposed to leaving any surfaces as-cast or as-forged.

Not an obsolete usage, but not seen as commonly as it was decades ago; not least because parts that once would have been spot-faced castings are now likelier to be contoured from billet with CNC milling. This same spirit is behind the shift in military standards from writing requirements about methods to writing them instead about performance, with the method to reach that goal being up to the ingenuity of the designer.

It typically tells you what sort of geometric condition e. Rationales for field of the drawing drawing changes that are noted in the rev block often use these abbreviations for brevity e.

It is numbered with a stylized flag flag note, flagnote symbol surrounding the number. A general note applies generally and is not called out with flags.

Flagnote: A flagnote is a note that is called out in specific spots in the field of the drawing. It is numbered with a stylized flag symbol surrounding the number or sometimes a delta symbol. A general note applies generally and is not called out flag note, flagnote; find with flags.

Find number: “FN” meaning “find number number” refers to the ordinal number that gives an ID tag to one of the constituents in a parts list list of materials, bill of materials. Thus “fasten using FN7” refers to a fastener that is “find number” 7 in the list. FoS A type of physical feature on a part. An FoS is a feature that can have size associated with it, usually involving the opposition of two surfaces e.

Features of size FoSs in reality always have actual sizes and feature of size forms that differ from their theoretical size and form; the purpose of tolerancing is to define whether the difference is acceptable or not.

FS The drawing notations “near side” and “far side” tell the reader which side of the part a feature is on, in occasional contexts where that fact is not communicated using the rules of projection alone. Contexts of usage are rather limited. One example is hole locations; “3X AND 3X FAR SIDE” defines symmetrical groups of 3 holes on both sides of a part 6 total , without having to redefine equivalent hole center coordinates on two separate views, one for each group.

This is not only a convenience for the designer but also a method of error prevention, because it provides a way to avoid forking far side geometric definition that ideally should be kept unforked to prevent discrepancies. For example, the groups defined above cannot accidentally become asymmetrically discrepant in a future revision by the revisor failing to revise both groups equally because their definition is unified in only one place.

Another example is part marking locations. An area for part identification marking can be circled on a top view but assigned to either the top or bottom of the part simply with a “near side” or “far side” notation—which obviates adding any otherwise-unneeded bottom view to the field of the drawing. The “W” comes from the element hardness, Brinell, symbol for tungsten, W, which comes from the tungsten tip German Wolfram. I IAW in accordance with A common need in engineering drawings is to instruct the user to do activity X in accordance with technical standard Y.

Part of the motivation behind the choice of words “in accordance with” is that they do not allege that any particular activity is explicitly specified by standard XYZ. But this is a subtle connotative distinction, and “per” and “IAW” are denotatively equivalent. They are thus subjected to higher inspection sampling levels. L LH Referring to handedness, such as the helix left-hand handedness of screw threads or the mirror-image handedness of a symmetrical pair of parts.

Means that a feature of size FoS is at the limit of its size tolerance in the direction that leaves the least material left on the part. Thus an internal feature of size e. Drawings may model-based definition be printed plotted from the model for reference use, but the model remains the governing legal instrument. Means that a feature of size FoS is at the limit of its size tolerance in the direction that leaves the most material left on the part.

There is only one correct casing for the symbol, cap-M-cap-P- small-a, which, like any SI unit of measurement megapascals symbol, properly should be preserved even when surrounding text is styled in all caps which latter is a frequently employed tradition in engineering drawing. But it is not uncommon to see “MPA” through carelessness. Users are not confused regardless. MS- Standards established by the U. Standard hardware sometimes uses the MS- prefix in the catalog numbers. Standard hardware for aerospace work sometimes uses the NAS- prefix in the catalog numbers.

See also AN- and MS-. NC National The [U. NCM This abbreviation is used in a machine shop when nonconforming recording nonconformances out of tolerance, etc. Helps to analyze system weaknesses such as nonconformance report worn-out equipment, operators in need of more training, or risky practices.

NEC In the sense of “not elsewhere classified”, the not elsewhere abbreviation is well-known within certain fields, but classified; National not others; to avoid confusion, spell out. Mechanical Drawing Symbols.

Process Flow Diagram Symbols. Mechanical Engineering. Mathematics Symbols. Making Mechanical Diagram. Process and Instrumentation Diagram. Mechanical Drawing Software. Mechanical Design Software. This clause extends UML ports to support nested ports, and extends blocks to support flow properties, and required and provided features, including blocks that type ports.

Ports can be typed by blocks that support operations, receptions, and properties as in UML. SysML identifies two kinds of ports, one that exposes features of the owning block or its internal parts proxy ports , and another that supports its own features full ports. Default compatibility rules are defined for connecting blocks used in composite structure, including parts and ports, with association blocks available to define more specific ways of doing this.

These additional capabilities in SysML enable modelers to specify a wide variety of interconnectable components, which can be implemented through many engineering and social techniques, such as software, electrical or mechanical components, and human organizations.

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Mechanical engineering drawing symbols pdf download – AutoCAD 2016: A Problem-Solving Approach, Basic and Intermediate

 

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