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 ...
  • 22.8k
6 votes
Accepted

What loads are office desks required to withstand?

In the United States at least, the design of mass-produced furniture if covered under ANSI/BIFMA (Business and Institutional Furniture Manufacturer's Association) X5.5. I don't have a copy of the ...
  • 4,501
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....
5 votes
Accepted

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 ...
  • 1,578
4 votes
Accepted

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 ...
  • 3,435
4 votes

What is the name of this section?

In the Southern African context this would be defined as a "cold formed lipped channel" section. I am not sure if it the same across the world though. Here is one supplier's link
  • 1,216
4 votes
Accepted

Uncertainty Calculation of LVDT displacement transducers for length measurement

For the Maths of calculating uncertainty the standard document is the GUM. Which describes all the maths but can be somewhat unclear if you don't already have some idea how it is supposed to work. ...
  • 1,025
4 votes
Accepted

Normative Document for 'Grade 520' Steel

I saw some material for tension rods that match the material properties that you gave, but these places do not list the steel used. It might be proprietary: Ronstan DaverSteels A third manufacturer ...
  • 10.7k
4 votes
Accepted

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 ...
  • 12.5k
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 ...
3 votes
Accepted

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 ...
  • 2,631
3 votes
Accepted

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/...
  • 604
3 votes

What organization specifies unit of measure conversions?

Internationally, the General Conference on Weights and Measures (French: Conférence générale des poids et mesures - CGPM) is the senior of the three Inter-governmental organizations established in ...
  • 9,527
3 votes

What organization specifies unit of measure conversions?

In the US the National Institute of Standards and Technology (NIST) was established in 1901 by U.S. Code, Title 15, Ch. 7, sec. 272. Section (b) of that code states that, among other things, the ...
3 votes

Normative Document for 'Grade 520' Steel

ASTM A615 appears to standardize rebar using that grading designation: i.e. Grade 520 [MPa] (or Grade 75 [ksi]), but only provides testing to ensure that a particular material is at least some ...
  • 3,981
3 votes
Accepted

Industry standard for AC wall electrical box space

The normative reference for the design of wall boxes for electrical work in the US is NEMA OS-1 for metal boxes and NEMA OS-2 for nonmetallic boxes. This, in turn limits the size that components to go ...
  • 4,501
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, ...
  • 12.5k
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 ...
  • 4,913
2 votes

LO/LC, CSO/CSC Valve Definition

That would be Process Industry Practices, Practice Ref. PIC001. Issued 7/15/1998. Appendix A1 contains exactly what you listed. Edit: I just came across this online: PIC001 Sample, Not for ...
  • 528
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/...
  • 12.5k
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://...
  • 312
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 ...
  • 6,133
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 ...
  • 9,527
2 votes
Accepted

Tolerance on bolt major diameters

Here is a link to a screw thread chart. http://www.engineersedge.com/screw_threads_chart.htm Note there are different tolerance classes, and also note the max is never over the nominal size. For ...
  • 979
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.
2 votes
Accepted

Dead weight pressure tester for very low positive pressures

In this situation, you might do just as well to use a U-tube manometer. Is some respects, this is a sort of dead-weight tester where the fluid itself is the dead weight. In this device pressure is ...
  • 1,976
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, ...
  • 5,932
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.
  • 5,932

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