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1500 questions
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Could a water stream be used as a fiber optic sensor and detect when the stream is broken?

I have a small idea/project I am working on in which I want to use a water fiber optic sensor that can detect whether the water stream is broken and if so shut off the water. Having looked into fiber optic sensor systems in general, all I have…
James Dawson
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How to prevent algae in water cooled laser tubes?

I recently got a laser that is water cooled via a couple of clear plastic tubes (about .5 cm diameter). I have heard it can happen that algae or other undesirable inhabitants can get into such tubes and cause problems. I have also heard that…
Yly
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Wood roof specs on engineering drawing

I am trying to decipher some as-built drawings for an old wood frame building. The purpose is to generate a preliminary load takeoff. I cannot figure out what the following is saying: It looks like "3 Ply Built up roof " but the rest makes no…
user32882
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What is the opposite of flaring a tube (pinching?) and is there a tool to do this with aluminum?

I'd like to make my own structure that will hold roughly 50-100lbs of equipment. Since I need this to be portable, I feel like aluminum tubing would be the most practical. My structure will basically be a 2.5'-10' cube. I want to get 2.5' tube…
ntgCleaner
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Why does hydrogen fuel produce less horsepower than gasoline in internal combustion engines?

I was looking at hydrogen as alternative fuel and came across an article stating that although $\textrm{H}_2$ produces more energy than conventional fuel, it produces less horsepower in internal combustion engines. I thought that more energy ($143\…
Khaled
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What prevents using a toothed blade with a cutoff saw designed for abrasive discs?

I have an abrasive cutoff saw that I use to cut metal, it runs at 3800RPM. You cannot cut aluminum with these saws, so I bought a carbide blade rated for 3800RPM. I went to install it, but after looking in the manual I don't think it is such a good…
Voltage Spike
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What is the significance of a processors bit capacity?

I'm learning about how processors send an address to ram through the address bus, and receive and send data from ram through the data bus. In the videos I have watched, the processor was an 8 bit processor that had 8 wires coming out for the data…
user4912
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Cantilever Table Legs

I am building a table with four legs which must support a dead weight of 250 kg, and possible peak dynamic load of 1000 kg (A 200 kg person climbs onto and off of it). The legs come straight down from the box, rigidly fixed to an aluminum tubing…
robertbranham
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How do I extrude a region in autodesk inventor?

I'm a beginner at autodesk inventor. For some instances when I click a region to extrude it doesn't come alone. The screenshot below illustrates something even stranger. What should I do to make this not to happen?
titus
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What do you call the steel property that reduces the likelihood of shattering?

What is the property of not shattering, in for example a brisant explosion, called? And what kind of steel would I want that has this property?
Emlingur
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Dynamic mass balance in plug flow reactor

So I would like to ask you about a problem I encountered. The case study goes like this: I want to study species distribution inside a packed bed reactor, at first at steady state but eventually what interests me is the dynamic behavior of the…
ASK22
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Did I wire these solar panels correctly?

recently I bought 3 solar panels rated at 5V 200 mA each. I want to use them to charge a 5V battery bank to charge a phone. Thinking about the proper way to put them, I thought i can connect all in parallel to get maximum current, but realized that…
Nadim
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How does the S-N curve (or Wöhler curve) of a material change with frequency?

How a Material fatigues can be characterized by a Wöhler curve where each datapoint corresponds to a failure with the stress on the y-Axis and the number of cycles on the x-axis. An example is the following Wöhler curve: How does this curve change…
JHK
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How does Alloy 20 compare with Ti 6-4, C-276 and 316 stainless for corrosive service?

While I've designed tons of plastics for corrosive service, the fasteners to hold the plastics together are inevitably metallic. There have been a lot of ways to protect them from rusting (due to exposure to things like 33% HCl, 50% H2SO4, 50%…
Mark
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How do I add a resistance to mechanical movement in both directions, apart from friction?

What options do I have for creating a resistance to a mechanical movement apart from simple friction? Assume I have a lever, which will result in either circular or linear motion. I want to be able to apply a resistance to this motion, so that the…
John
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