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1500 questions
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2 answers

Why manufacturers prefer Brass over Copper in electrical conductors?

I am working on product where we need pogo pins, as copper is better conductor of electricity I was searching for the copper pogo pins. After about a month of searching, it is come to my notice that most of the manufacturers are dealing with pogo…
Xinus
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Relative strength of wire mesh vs rebar for reinforcing a concrete slab

I have a friend who is German and he says that wire mesh is much stronger than steel bars (rebar) and is mandated in Germany for reinforcing concrete slabs. The question is, is that true, and why? Here's a typical concrete reinforcement here (in…
thelawnet
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How to optimise feed-forward control of a process based on a prediction using the prediction confidence?

I'm looking for a control method for a production process with the following characteristics: 1 control variable many process parameters (+-50) 1 resulting variable continuous measurement of resulting variable with 30-90 second delay complex…
marqram
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Should I model the load from a pool at the top floor of a multi-story building as live or dead?

I am designing an aquatic center on the top floor of a multi-story building. The critical beams and columns to be designed are supporting a 25 m lap pool and I am wondering whether to apply a live-load or a dead-load safety factor to the water load…
Belal Azhar
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How to find press fit/ slip fit for non standard size parts?

I am looking for calculator or chart for slip fit and press fit for non standard size parts. For example, I have oversized dowel pin 10mm +0.03/+0.01 diameter. I need to create a slip fit hole for that oversize dowel pin. What the size and the…
Marco
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Radiators in series or parallel?

So let's say I have some heat generating machine be it a combustion engine or a fridge cooled by a fluid. I don't have a single radiator that is big enough for the amount of heat being generated but I do have a couple of smaller ones so I guess I…
Cathier
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How to calculate tensile strength of braided steel wire?

I am working on project involving designing a recoil spring coil of diameter 10.2 mm and wire diameter 1.25 mm. I tried using a solid core wire but it failed due inadequate tensile strength. Dimensions can only be altered by 5 mm, which is not…
Rohan
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Why are spur gear ratios not always whole numbers in practice?

Defined the Gear Ratio ($i$) as the ratio between the number of teeth on the pinion (driving gear) ($N_{1}$) and the number of teeth on the gear (driven gear) ($N_{2}$). Why is this better, if better at all, having non-integer values of $i$? Could…
pedrez
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Copper is more conductive, so why use lead battery terminals?

Copper is around 14 times more conductive than lead according to this source. If this is the case why are car battery terminals and connectors built using Lead? I saw both types of replacement connectors at the automotive store and am interested in…
user7785
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Can masoned ceilings be flat?

In historical or modern buildings, flat ceilings are typically made of concrete, wood, metal, solid bedrock (for carved tunnels), or generally a material that can withstand pushing forces (pressure) and pulling forces (tension). A ceiling made from…
donquixote
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What makes something like water so hard to change its density?

So I'm taking a compressible flow class soon, and I've been thinking beforehand about the topic. A substance like water can easily be pressurized, but its density doesn't change easily, meaning there has to be some microscopic force between…
Jesse Batson
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Why are nuts 6-sided?

Why are nuts 6-sided? Why not 4 or 8?
Filip Haglund
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How does LTE eNodeB set the Base Station output power?

I'm interested into the power radiated out of an eNodeB (LTE/4G) radio base station: which parameters does this power depend on, if they are constant or relying on the environment... All of this in order to be able to predict the rated power…
Amesys
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How to simulate a crack in a PCB?

I want to break this PCB with some know force of X newtons in the bottom left tip of the PCB. The problem is that in Static Dynamics I just get infinite deformation and in explicit dynamics I really don't know what to do. Anyone knows how to do…
Gabriel Barros
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Why the design of continuous beam is always more economical than beam with supports?

Assuming that I have a beam that spans across a few supports. I can design the beam as a continuous beam (a beam that is loaded and has more than two supports), or individual beams that each encompass between two supports. From what I know, the…
Graviton
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