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9 votes

What is the accepted way to write units when specifying multiple dimensions?

I 'll start with the one that you should DEFINITELY NOT use: $mm^3$ or $mm3$. Probably the most widely used is the 1st. It's compact and economical and these are two of the most deciding factors in ...
NMech's user avatar
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6 votes

What is the accepted way to write units when specifying multiple dimensions?

In an earlier comment, I suggested that an answer to "what is the correct way..." (as opposed to "What is the generally accepted way...") might be found in the ISO 80000-3 standard....
Daniel Hatton's user avatar
5 votes
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What is the engineering standard for filenames with fractions and inches?

I've seen numerous formats in my experience. Per some of the comments, sometimes you'll see a fraction represented with dashes, underscores, or as a decimal. I find that most often, decimals are ...
GisMofx's user avatar
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4 votes
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Filename standards and spacing

If you are likely to share your files with other organizations that use different operating systems, you need to research what works best on all the main options - i.e. Windows, MacOS, and the various ...
alephzero's user avatar
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4 votes
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Schematic Diagrams for Mechanical Systems

The diagram most closely related to the original question seems to be a kinematic diagram. Kinematic diagrams are standardized in ISO 3952, although it seems that most often people are just copying ...
joojaa's user avatar
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4 votes

Are there standard terms that correspond to the anatomical axes, planes, and directions?

This answer comes from my experience in mechanical engineering, a structural engineer might have a different perspective. It is difficult to come up with a standard set of terms for planes or axes in ...
BarbalatsDilemma's user avatar
3 votes

What is the 'application standard' referred to in EN 1993-1-7

I think it means the relevant section of EN 1993 for the specific use (application) of the plated structure. A partial table of contents of EN 1993 includes Part 2: Steel Bridges Part 3-1: Towers, ...
alephzero's user avatar
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3 votes
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How can the shear capacity of a concrete slab be determined for effective depths under 200mm? [Eurocodes]

As @Wasabi and @AndyT mentioned in the comments, this means the maximum value $k$ can have is $2$, so if $d<200$ then $k=2$. This can be confirmed in the section on shear design for slabs from the ...
atom44's user avatar
  • 2,651
3 votes
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Standard properties of air

Cengel's Book: Yunus A. Cengel;John M. Cimbala;Robert H. Turner, Fundamentals of Thermal-Fluid Sciences. 4th. McGraw-Hill, 2012 Here is an extract of the property tables: http://www.kostic.niu.edu/...
Physther's user avatar
  • 614
3 votes

ISO standards for drawing reserve equiptment in P&IDs

A P&ID should reflect reality A P&ID that doens't reflect the actual piping construction is a flowchart, not a P&ID. P&ID's are used to determine valve lockout and blind flange ...
Tiger Guy's user avatar
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3 votes
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Can I omit the scale information in the technical drawing of a mildly complex mechanical part if I provide all of the necessary dimensions clearly?

You should not ommit the scale. Even if no one seems to read it, it is still important information. The task is quite trivial, I don't see any reason why to remove the scale because it can cause ...
loStraniero's user avatar
2 votes

(de facto) Standards for freehand technical lettering?

There is an ISO standard for this. The latest version is (probably) "ISO 3098-1:2015 Technical product documentation -- Lettering -- Part 1: General requirements". http://www.iso.org/iso/home/store/...
alephzero's user avatar
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2 votes

(de facto) Standards for freehand technical lettering?

I don't know if there is a formal "standard" for lettering on hand drawings. The best I could tell you to do is consult an older drafting text or the book "Architectural Graphic Standards": http://...
user16622's user avatar
  • 314
2 votes

How is sandpaper grit size (the FEPA number system) defined?

In general grit numbers refer to the size of mesh that the particles will pass through. There are various ways of indicating this but it is typically some variation of the number of strands per unit ...
Chris Johns's user avatar
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2 votes

Are there standard terms that correspond to the anatomical axes, planes, and directions?

For aviation, aerospace, and naval (and to a lesser degree automotive) engineering, the three axes are pitch, yaw and roll axes - with the names pitch, yaw and roll corresponding to rotational motion ...
SF.'s user avatar
  • 6,105
2 votes

Are there standard terms that correspond to the anatomical axes, planes, and directions?

In engineering there are four views, or axes that I can think of: longitudinal - which is parallel to the longest vertical side of an object, cross-sectional - which is parallel to the shortest ...
Fred's user avatar
  • 9,702
2 votes

Converting flow rate from normal/standard liters per minute to cubic meters per second

The conversions can be found at this wikipedia page $$ 1 \frac{m^3}{s} = 1000 [NLPM] \frac{T_{gas}}{293.15}\cdot\frac{14.696 [psi]}{P_{gas}} = 1000 [SLPM] \frac{T{gas}}{273.15}\cdot\frac{14.504 [psi]}...
NMech's user avatar
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2 votes

What ASTM standard would be appropriate for testing the breaking strength of nylon ropes

Go directly to the ASTM site. I put "nylon rope" in search and it said there were 154 possibilities.
blacksmith37's user avatar
  • 6,154
2 votes

What is the engineering standard for filenames with fractions and inches?

We use the left bracket. It looks the best in our opinion: 1/16" = 1[16 in. 3/8" = 3[8 in.
Shayne Turner's user avatar
2 votes

Elongation values for materials

A few points; Actually covering the subject requires a book. For steels , the differences in properties vary with thickness because of : 1- inclusions, 2- grain size, 3- hardenability, 4- composition, ...
blacksmith37's user avatar
  • 6,154
2 votes

Converting flow rate from normal/standard liters per minute to cubic meters per second

Different from technical mass units, a technical volume unit always depends on ambient conditions. The difference between NLPM and SLPM is: We put 1 liter of air at 0° C and sea level 1013.25 mBar in ...
SKR's user avatar
  • 21
2 votes

What is the accepted way to write units when specifying multiple dimensions?

1x2x3 mm is usual. You might specify individual units if they used different multiples. For example, if you had a large sheet of thin material you could describe it as 1 m x 2 m x 3 mm. However in ...
Graham Nye's user avatar
2 votes

Standard vs code

Standards are experts common sense thoughts on the minimum safe ways to design, build and operate something. Standards are designed for voluntary use and do not impose any regulations. However, laws ...
StainlessSteelRat's user avatar
2 votes

Drawing documentation: Is possible to keep the original drawing valid when revised version is released?

Typical ISO practice is the most recently approved and released drawing is valid. A common work around for off the shelf parts, like bolts, is to have one generic drawing number for multiple part ...
jko's user avatar
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2 votes
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ISO standards for drawing reserve equiptment in P&IDs

From ISO 10628-1 Diagrams for the chemical and petrochemical industry — Part 1: Specification of diagrams 4.4 Piping and instrumentation diagrams (P&ID) All equipment, valves, and fittings shall ...
StainlessSteelRat's user avatar
2 votes
Accepted

Are bolt and nut dimensions standardized?

The thread shape and pitch of all M-series nuts & bolts is standardised. So an M10 nut from one manufacturer will fit an M10 bolt from another. There's no standard for the length - you can buy ...
Simon B's user avatar
  • 214
2 votes
Accepted

What does it mean for an item's tensile strength to be "rated"?

"Rated" means it has been proof-tested by an independent lab (like UL or CSA) according to a published standardized test protocol invented by a standards organization (like ASTM) and ...
niels nielsen's user avatar
1 vote

Elongation values for materials

A specimen of each material, precisely machined to specific dimensions, is tested under controlled conditions to measure the change in length according to a measured load. That gives the elongation ...
Solar Mike's user avatar
  • 15.9k
1 vote

What ASTM standard would be appropriate for testing the breaking strength of nylon ropes

Probably ASTM A931 - 18 Standard Test Method for Tension Testing of Wire Ropes and Strand There are others closely related but not exactly the same. ASTM F3410 - 19 Standard Test Method for ...
NMech's user avatar
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