Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [equipment-selection]

Questions about how to choose the correct size, grade, options, etc. for a known piece of equipment, given a well-defined use case.

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How to evaluate new Vernier calipers?

I am looking to purchase some new Vernier calipers, but I am overwhelmed by the amount of specs which are being offered. I need help in understanding how to evaluate them. I do not want a dial or digital set of calipers, but rather am interested in…
RobertBarington
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How to select a low flow rate diesel flow meter

I need to select a precise flow meter for the following application condition: Flow range: 0-150 liter per hour Medium: Diesel There are so many meters on the market that I am a bit lost. How do I determine whether a flow meter is acceptable for…
Maruf Hossain
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Understanding a Caterpillar Excavator Recomendation for Increasing Life

I am trying to understand / interpret one recommendation I read on a Caterpillar website for maximizing excavator life: ** Never dig over final drive. ** Can anyone explain what this means? What's the "final drive" and what does digging over it…
curious_cat
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How to determine the number of effective anchors in a base plate?

The situation is a steel baseplate that has to be anchored to concrete to resist lateral loads. The lateral load on the base plate is great enough that more than one or two anchor rods are required. The base plate has room for 8 anchor rods. The…
hazzey
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What is the opposite of an uninterruptible power supply called?

The question title says it all. I'm looking for the opposite of a UPS, ie it won't turn back on if there is a power outage. I know they exist but, I can't remember what they are called or find them on Google.
user1543042
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How can I find the price of a product if the manufacturer doesn't show it on their website?

I need to buy a particular brand and model of stepper motor and I have found the product on the manufacturer's web catalog, but with no price listed. How can I find the price of device? I tried writing to the manufacturer but they haven't…
Andrew Kachalin
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What's the easiest way to count high speed pulses?

I need to count digital pulses with a width of 30 ns and display the updated count to the user every second. The pulses have already been through a comparator and a pulse shaper. Resolution isn't a concern, my only concern is the counting the number…
Alex
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Transistor choices for switching high speed data communication lines

So here's my situation: I'm a mechanical engineering student working on a product innovation for one of my courses. The product itself is fairly heavy into embedded programming, which I'm comfortable with. What I'm less comfortable with is the small…
agentroadkill
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Compact way to regulate 3000psi (200bar) down to 30psi (2bar)?

This was originally posted on the Lego page, and closed because it's not actually about Lego itself. I thought I'd give them a chance first, in case someone had done this already and had some application-specific knowledge. But it looks like…
AaronD
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Calculating the proper power of a motor

I'm trying to build a filament extruder with some basic available tools and materials. Simply the main principle of the machine is to insert some amount of plastic raw material ( ABS in our Case ) to a hopper , move them inside a barrel with the…
ahm_zahran
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External Static Pressure on Open Gallery Fan

I routinely work on building designs that incorporate rooftop upblast fans over large industrial spaces such as this one: When selecting these fans, as with every other fan, you need to determine the external static pressure that the fan will…
Secundus
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Is there a probe sonicator horn made of carborundum?

I consider buying a probe sonicator for an experiment, which needs the horn tip to be made of silicon carbide (aka carborundum), or at least surface covered with it. Is it even possible to make such a thing, given that sound propagates better when…
Paul Kolk
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How to detect the voltage of Tx and Rx lines of USB

I need to build a circuit that would be able to detect the voltage in the Tx and Rx lines of the USB. I have used a multimeter to check the voltage whenever there is a data flow and it's about 1 volts. So, how to indicate that using an LED…
Ofosot
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Highest temperature elastomer

I'm getting more into TIG welding these days & one thing I haven't quite mastered is feeding the filler with my less dominant hand (my left hand). My instructor taught me to simply use my middle finger & thumb to "slide" the filler. What I found…
Tempus Nomen
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Electrochemical cell - how to remove glass shards from tiny hole?

This is oddly specific, but I am having trouble making the setup work for my electrochemical cell. We're doing SECCM and the device has a capillary tube fit through a small hole, where the electrolyte droplet makes contact with the metal surface.…
rydo
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