# Tag Info

42

At the beginning of my career (1979) as a design engineer at HP, the mechanical engineer created the part design and then rendered it in pencil on paper, and then transferred it onto sheets of vellum paper held onto a huge flat tilting table called a drafting board which had a precision sliding arm on it with which parallel and right angle lines could be ...

17

In the offices I worked in, drafters were also expected to have a grasp of the trades required to build the thing they were drawing. They'd have some background in welding, fitting, and fabrication. They were expected to draw something that was a) faithful to the mechanical engineer's design, and b) practical to build. We'd often get comments from the ...

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Yes, getting a second opinion can be useful. This is done routinely in weather forecasting where exact solutions are unknown, and there is some judgement about how to apply various factors. There will be less wiggle room in something like a finite element mesh stress analysis because the iterative equations for solving it will be basically the same no ...

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Speaking personally (as someone who deals with this sort of thing for a US Class I on a regular basis) -- operational and maintenance personnel find railroad locations the same way you and I find highway locations -- milepost + track name, and named locations called "stations" in US railroad parlance. The former are not far off in usage from their highway ...

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Summary: 1) The answer to this question is difficult. You would need to know how austenite and ferrite behave in relation to what you are doing to them. You would also need to know their compositions, temperature field, etc. The results here could vary significantly depending on the specific parameters and how they change with time and with each other. 2) ...

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I write this from the perspective of an engineer who develops simulation software. I think the practice described is bad, and I recommend you do not use two different softwares to "confirm" the results. In general, two different modeling softwares can not be used to confirm much anything other than their similarity. Two softwares could easily both get two ...

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I think the duties that engineers have to perform are independent of the tools they use. Nowadays there seems to be a trend that everybody involved in a working process, regardless of if we are talking about research and development, design, manufacturing or service, relies too much on CAD (or any other software tools) itself. A good working process, and a ...

5

But I am left with a question I don't have the answer to, nor the resources to answer it. These days it seems most mechanical engineers (at least the ones I know) are really performing the role of both the draftsman and the engineer. IMHO Solidworks (and other similar products) for the engineer today are much like a scientific calculator back in the 1980 ...

4

Commercial air traffic is in pretty constant contact with air traffic control, and GPS is not the primary method of tracking aircraft position. This article, written in the wake of the MH370 disappearance, gives a pretty good rundown of how planes are tracked currently. The essence of it is that most air traffic control systems still rely on radar, whether ...

4

I think this is a good practice overall. By using two different softwares, you may be able two avoid two kind of errors: 1) errors that come from an inaccurate software (which should not be overlooked), 2) errors that come from the lack of habit of the user with the software (hidden options, default settings...). If the softwares are different enough, the ...

3

Okay, it took me way too long to figure this out. I'm thinking this is just not a very intuitive interface. Here's the fix for anybody else who makes it here. Click #1, Click #2 (carefully!), then check the box at #3.

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In most cases a position on the track will be most useful as GPS probably won't have high enough resolution to indicate which line it is on if there are several tracks in parallel. Also many signalling systems work by sectors where only one train is allowed to enter a given stretch of track at any given time. Similarly the precise location doesn't really ...

3

In structural analysis, one represents a real beam (or column, or any other "unidimensional" element) is represented by one or more bars. A bar is defined as a connection between two nodes. If you join all the horizontal bars into one, then you'll be stating that the left-most and right-most nodes (belonging to bars 1 and 24, respectively) are connected, but ...

3

your system of equations is underdetermined, which means that you don't have enough information to solve it. You can proof it by calculating the determinant. For a unique solution it has to be unequal zero. http://en.wikipedia.org/wiki/System_of_linear_equations For static problems the determination can be assessed by counting the degrees of freedoms and ...

3

Base on the information provide try shorting the jumpers on the 4D Systems LCD Display. As best as I know Android LCD cape only recognizes the LCD at a specific address. I believe there is EEPROM information in the LCD cape that is required to complete the android boot up process (Verification required for this sentence). Below is picture to help locate ...

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I think the hint comes from the tab that says SOLIDWORKS in the left column, near the top of the block of actions. It's not visible in this screen shot, but is clearly visible in the video linked in the post.

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The images references that you have provided look like they could have been produced in LaTeX, possibly using the TikZ package. Have a look at this example http://www.texample.net/tikz/examples/free-body-diagrams/ and this minimal introduction to TikZ to see if it can provide the functionality that you're after! http://cremeronline.com/LaTeX/minimaltikz.pdf ...

3

This question may be better suited for the software recommendation SE and perhaps could be migrated. Consider that Meshlab meets a couple of your requirements. It's open source and has a comparison capability: Measuring the geometric difference between two 3D models using Hausdorff Distance is a common approach in mesh processing. Many years ago (in 1997!), ...

3

We didn't have to ask how to use our tools. This SE is filled with how do I... for Solidworks, Abaqus, Ansys APGL... I guess we spent more time drawing and calculating, versus figuring out how to make software do it. We probably also got a lot less done.

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The mechanical engineer actually designs the thing. The draftsman's job was to render the engineer's intent in a drawing which is clear and unambiguous. So the engineer can say "yup, that's what I meant" and the fabricator can say "yup, I can build that". And here's the important thing: when the part doesn't work out, the drawing decides ...

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Answer from the point of view of a Design Engineer Checking the results of one program against another will give you some level of certainty that the results are correct. It is unlikely to give you 100% certainty, but then that level of certainty is hard to achieve. A big issue I see is being able to transfer the model from one piece of software to another. ...

2

I concur with the other answers here, that this in general can be a good idea and will help ensure the accuracy of simulation results. In terms of how good it is in relation to the other verification methods, I'd say previously known results and physical tests are both better options if feasible, but hand calculations may require over-simplification if the ...

2

In short, by having them each as single members or beams should not be influencing the result provided that you have connected them together as fully fixed/welded (this is the member end condition - there should be no releases at the ends of the members so that the software will treat the individual members as one continuous member). Combining them into one ...

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The problem is relatively simple if the supports have infinite stiffness. The way to then solve it conceptually is to apply the principle of superposition to: (a) system with a support at $C$, applied force at $B$, and no constraint at $A$ $\rightarrow$ get deflection $\delta_{A1}$ at $A$; (b) system with force $F_A$ at $A$, reaction force at $C$, and no ...

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I think your history isn't quite right here. The first widely-used CAD systems used Bezier curves, where the end points of each section do lie on the curve. For cubic Bezier curves, the intermediate points also lie on the tangent lines at the end of each segment. This corresponds quite closely to the constraints that are implied by using a physical drafting ...

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You can remove the ".1" from the extension, so they are just .prt files - the .1 is to do with sequential numbering of backups, I believe. They can then be opened / converted using Autodesk Fusion 360, which is free for non-commercial use.

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I am not too familiar with the VCU, PV780, or PowerVision. Based on your description PV780 can be configured to be the Instrument Cluster Panel (ICP) for Engine Control Unit/Module (ECM) or Transmission Control Unit. To keep a response short I have selected a Temperature gauge of the IPC. There is a very good chance this information communicated to the IPC ...

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For Windows, Linux and Mac, Solvespace will allow one to create three dimensional objects in a parametric as well as free-form manner. Text and dimensions are part of the program's features. The web site provides tutorials and other useful reference material. If you did not have the requirement for dimensions, OpenSCAD would have been a good choice. There ...

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CAD packages, drawing packages, you can even use shapes in software like Word & Excel, but most book diagrams were drawn by hand (until computers became common) - which explains the profession of draughtsman or draughtsperson to be pc...

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If you're interested in using Python, check out the pint, astropy.units or unyt packages. I have personally used pint + jupyter for day-to-day engineering in the past, and have looked at the others and they all should be suitable.

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