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Mutually incompatible MagLev standards?

As magnetic levitation (MagLev) train systems have been developed since the 1980s, I have a question of What standards used in MagLev train systems would make two MagLev lines mutually incompatible? ...
Krišjānis Liepiņš's user avatar
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0 answers
18 views

Tr8x8 Lead screw - What standard, and where do I find dimensions such as pitch (mean) diameter

I'm trying to pick a lead screw and stepper motor to form a linear actuator for a personal project. I'm trying to do the calculations on the lead screw to get from input torque to max lifting force. ...
Gary van der Merwe's user avatar
1 vote
1 answer
52 views

Which failure probability is low enough to be considered as 'will not happen'?

Like you will be fired/sued/shot if it happens. I use 1 / 100 million / year (global catastrophes happen on Earth every 100 million years so it is likely no one will care about me) But maybe there is ...
Sergey Alaev's user avatar
0 votes
1 answer
38 views

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

I found a 40ft. length of rope for sale at the dollar store. Not having high expectations to start with, I examined the packaging closer out of curiosity. The front of the label states that the rope ...
Bigbio2002's user avatar
0 votes
1 answer
178 views

Figuring out thread (neck finish) for bottle cap

I've done a fairly large amount of googling on two different occasions trying to figure out what neck finish I have on a particular bottle thread I have here. I'm in europe and this is for a plastic ...
TrisT's user avatar
  • 99
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1 answer
87 views

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?

and thanks in advance for taking the time to help me. TL;DR: I work for a company where I need to make technical drawings—mostly using SolidWorks—of some mechanical components. Do I have to include ...
Hasan D.'s user avatar
1 vote
1 answer
46 views

Should codes on instruments represent the quantity they measure or the quantity they regulate (P&ID)

Let say you want to make a P&ID diagram of a process in which a level sensor transmits its data to a flow controller. The quantity measured is a tank's level, but the quantity controlled is the ...
A. Kvåle's user avatar
  • 121
-1 votes
3 answers
79 views

How to transfer compressed gas GH2 from one tank to another at the same pressure?

The problem is to transfer all the compressed hydrogen from one tank on a ship at 400 bars to fill another tank on earth (also to fill it at 400 bars). What are the common technologies and equipment (...
Aron PE's user avatar
1 vote
0 answers
32 views

What (standardized) naming is enough to completely specify a type of steel?

What (standardized) naming is enough to completely specify a type of steel? That is, the composition and properties. Take for example 1.0037 S235JR. Are these two numbers linked/equivalent, do you ...
jessegerritsen's user avatar
0 votes
2 answers
82 views

Are bolt and nut dimensions standardized?

Given the nominal size of a bolt/nut, e.g M10, can one construct all other dimensions from it? Do these dimensions differ between manufacturers or are these standardized. If so, where can I find ...
jessegerritsen's user avatar
0 votes
2 answers
54 views

Convention for describing infrastructure: From south & west to north & east

When textually describing the extents of infrastructure, such as the roads with red markup in the map below: Is there a civil engineering convention for the order/direction in which we would describe ...
User1974's user avatar
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0 answers
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Is seal water/lubriaction oil for equiptment shown in P&IDs? If so, how to show it? (ISO)

Given the sheer amount of pumps, adding seal water lines would complicate things a lot. One alternative would be to draw the lines coming the pump that pumps the seal water, and just symbolize them &...
user110391's user avatar
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0 answers
35 views

How to draw a pipe being moved between tanks? (ISO standard P&ID)

Where I work, we have a set-up that functionally, works as represented below: I represented it as such, due to a lack of know-how in regards to the actual, ISO-standardized way of representing this ...
user110391's user avatar
1 vote
2 answers
143 views

ISO standards for drawing reserve equiptment in P&IDs

Let's say you have two pumps, one always running and the other in reserve. Maybe they're switched regularly, or maybe the other is only used when the first is broken/down for maintenance. In a P&...
user110391's user avatar
2 votes
1 answer
84 views

Where to find a complete overview for ISO P&ID standards?

I have tons of questions in regard to what is, and isn't, in accordance with ISO standards when drawing P&IDs. So, I'm looking for a resource which gives a complete overview of the standards. ...
user110391's user avatar
0 votes
1 answer
55 views

Why aren't fasteners open standards?

I just wanted to find information for an M2 flat head hex socket machine screw which, I believe, is defined by ISO 10642, but unfortunately that is locked behind a paywall of a couple hundred dollars. ...
Kalcifer's user avatar
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1 vote
0 answers
1k views

What is DIN 338 for drill bits?

I'm looking around for drill bits, and I keep reading "DIN 338" everywhere. What is DIN 338? And what does it mean when a retailer or manufacturer writes "DIN 338" on the product ...
Mads Skjern's user avatar
0 votes
1 answer
189 views

how to interpret plots in ISO 10816-8?

In ISO 10816-8 for reciprocating compressors, there are some plots that show the allowable RMS vs. frequency for every part of a compressor. However, in the text of the standard, it is mentioned that ...
Ali Hosseinli's user avatar
0 votes
1 answer
542 views

Transformer secondary conductor protection: how do NEC 240.21(C) and NEC 240.4(B) make sense together?

NEC 240.21 says all ungrounded circuit conductors require overcurrent protection, with a list of exceptions: One of those exceptions is 240.21(C): 240.4(B) says that if you're under 800 amps, you ...
Stephen Collings's user avatar
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0 answers
46 views

Reference design for a HSK machine spindle?

Is there a reference design somewhere on the web for a HSK milling machine spindle (mainly HSK type A, between 40-63)? I'm mainly looking at the fixating mechanism (drawbar et al) and its tolerances; ...
MGuzzi's user avatar
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1 vote
0 answers
48 views

How to approach potential hazards that may result from user misuse, in a product design phase? [closed]

I am researching guidelines and considerations with respect to user safety when designing commercially sold products that contain user-operated machinery and moving parts (I.e. motors, pulleys, ...
Pholotic's user avatar
3 votes
1 answer
62 views

What's the process for starting an ISO or IEEE standardization?

So, I just saw this question on the Statistics SE site, about how in artificial intelligence/machine learning some people use a particular set of terms in one way, and other people use the same set of ...
nick012000's user avatar
2 votes
2 answers
113 views

How standardized are step pulleys/gear speeds on machines tools?

Edit/Note: This is NOT "the X/Y problem". The question I have asked here is exactly the question I need an answer to. I'm not asking how to selected the correct RPM for a given situation (...
BCS's user avatar
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0 votes
0 answers
606 views

Is the use of direct-expansion split systems to heat or cool exit enclosures permitted under the US model building Codes?

Most multistory buildings have enclosed exit stairways somewhere within them to provide safe egress from their non-discharge floors. In a building that relies on hydronic heating/cooling, steam ...
ThreePhaseEel's user avatar
1 vote
1 answer
2k views

Is there anything in BS 8888 regarding the scale of a section view?

If a section view isn't sufficient enough to show all details required, can it be at a larger scale than its parent view? Is there anything in BS 8888 regarding recommended scales in section views? ...
sworks2021's user avatar
0 votes
0 answers
147 views

Is there a mushroom head bolt standard for sizes smaller than M4?

Is there a standard similar to DIN 603 / ISO 8678 (metric mushroom head square neck bolts) for sizes smaller than M4. DIN 603 only goes down to M5 (please correct me if I'm wrong). I did see similar ...
Maybe Julius's user avatar
0 votes
0 answers
339 views

classes and grades of steel and stainless steel

I'm trying to learn the standard nomenclature for the steel and stainless steel mainly used in the bolts, screws, nuts, and other fasteners in general. So far I have created this table: | Metric ...
Foad's user avatar
  • 249
1 vote
1 answer
35 views

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

is possible (by European standards) to have two (or more) valid drawings with same drawing number but different revision indexes? For example: DRW-001 = Some Bolt ...
Lluser's user avatar
  • 131
1 vote
2 answers
106 views

Standard vs code

As an example ASCE 7 is a code that every civil / structural engineer must follow in USA. But if you look at ASCE 7 itself, search the word "standard", it calls itself a standard in many ...
upstream's user avatar
  • 462
0 votes
0 answers
30 views

Why is CGNS not used in CSM?

The CGNS format appears to be only applied in CFD (computational fluid dynamics). Why is it not applied in CSM (computational solid mechanics)? Is there any technical reason? The hierarchical ...
Elon Musk's user avatar
  • 129
2 votes
6 answers
744 views

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

When writing out dimensions in the form height x width x depth, what should you write for the units? For example, I can think of a few ways to approach this (assuming each dimension is measured in ...
JolonB's user avatar
  • 129
-1 votes
2 answers
23k views

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

I'm really confused about these three units commonly used for measuring airflow: cubic meters per second (m3/s) normal liters per minute (NLPM) standard liters per minute (SLPM) I would appreciate ...
Foad's user avatar
  • 249
3 votes
2 answers
187 views

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

ASTM D4268-93 would appear to be the relevant testing standard, but this was withdrawn in 2002 and is no longer active. Is there a current standard?
user8908459's user avatar
1 vote
3 answers
3k views

How do british standard pipe parallel (BSPP) (G) threads seal?

I realize that there must be some sort of o-ring, gasket, or washer, but from an engineering standpoint it is not clear how to know what fitting will seal to what without having the parts in front of ...
ericnutsch's user avatar
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1 vote
0 answers
10 views

Are there any specifications that address the environmental conditions items traveling though international post should be able to tolerate?

In terms of temperature extremes, air pressure, humidity, shock, ... In determining what ranges to design for in a device are there any standards or at least guidelines either by postal services or ...
norlesh's user avatar
  • 275
1 vote
2 answers
108 views

Elongation values for materials

According to EN standards, elongation for each material type has been defined, and it varies with different range of thicknesses for the same material. Why is it so? How is this value calculated?
Likhit K's user avatar
1 vote
0 answers
15 views

How can I learn the standards(EN,ANSI,ISO) which is related to "roller hemming method in automotive industry"?

There is a method using in automotive industry which is called roller hemming. I have a project about this method but before beginning the project I need to learn the standards(EN,ANSI or ISO) which ...
Yunus Temurlenk's user avatar
1 vote
0 answers
26 views

Standards for safety car seatbelts locking condition

Is there an (international) standard which determines the condition when a car seat belt locks? Which standard is it? Does the standard determines a speed in m/s of the belt, such that it locks if ...
Sarah's user avatar
  • 111
2 votes
0 answers
339 views

Maximum allowable crack in Post Tension concrete

What is the maximum allowable crack size dimension in a post-tension concrete slab before it is considered a "structural" crack, in Arizona, USA? Is there a certain standard for this. I have tried ...
chromechris's user avatar
0 votes
0 answers
527 views

Which K-factor (metal bending) is defined first, ANSI or DIN?

Description We had been through several issues with K-factor handling of two teams due to the same name assigned by different standards. ANSI and DIN has defined the same term for the same purpose. ...
ceremcem's user avatar
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0 votes
0 answers
1k views

What standards apply when specifying coating/painting in a mechanical part drawing?

I have produced a part drawing which calls up a machined mark on a flat surface, and the supplier has manufactured the part with this surface painted. I haven't added a note to the drawing that says ...
YoungPadawan's user avatar
3 votes
2 answers
553 views

What does the D stand for in the steel grade 16MND5

I would like to know what does the "D" means in steel grade 16MND5. According to the standard EN 10027: 16 means 0.16 % C MN 5 means 1.25 % Mn (5 must be divided by 4 to get the Mn mass fraction) ...
Stellarator's user avatar
1 vote
2 answers
48 views

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

I'm using the Eurocodes for some structural analysis and am looking for the limiting value of deflection of a plate. EN 1993-1-7, Section 8.2 states: For limiting values of out of plane deflection w ...
richyo1000's user avatar
2 votes
2 answers
283 views

What standard and/or code covers building stormwater management?

As an energy engineer focused on energy efficiency in the built environment, I am familiar with the standards and codes covering energy use in buildings; specifically ASHRAE 90.1, the "Energy Standard ...
LShaver's user avatar
  • 449
2 votes
1 answer
64 views

What standards exist regarding diagnostic systems in automotive engineering?

I'm designing a diagnostic system that simulates an environment and user input for a dummy vehicle. All possible critical situations are simulated in order to find out whether any errors are triggered,...
Bart's user avatar
  • 1,184
1 vote
3 answers
6k views

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

I need to save some engineering files that need the thicknesses in the filename. Windows hates "/" or "\", so I can't use a simple fraction. Symbols like this... ⅓, ⅔, ⅕, ⅖, ⅗, ⅘, ⅙, ⅚, ⅛, ⅜, ⅝, ⅞ .....
Davbog's user avatar
  • 373
1 vote
0 answers
79 views

Origin of barricade tape color combinations (allegedly OSHA)

Various sources (e.g., Wikipedia and WorkSafely) claim that the seven color combinations commonly used for barricade tape (a.k.a. caution tape) and safety markings in North America (yellow and black ...
Reign of Error's user avatar
3 votes
1 answer
54 views

What thread could this camera motor be?

Firstly, I am sorry that the title of this question isn't helpful. I have bought these motors for a project: 5V 7mm 2 Phase 4 Wire Stepper Motor I assumed that the 1.7mm diameter threaded shaft ...
JB515's user avatar
  • 31
3 votes
1 answer
3k views

EU EN standard 1822 vs US HEPA filters

There's a EU EN standard 1822 for air filters that has seen several iterations. The pre-2009 versions of EN 1822 (which seems to have come out in 1998) were pretty confusing as they allowed poorer ...
got trolled too much this week's user avatar
3 votes
0 answers
1k views

GD&T for Multiple Surfaces as Single Feature

I'm looking to get some collective agreement on a question that I have come across a few times now. When referring to features that are technically independent, what is the general consensus on ...
Argonax's user avatar
  • 106