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Stylus Materials

I'm trying to design a stylus for use with multiple touchscreen technologies, but I'm not sure what materials I should start with (specifically for the tip). Right now I'm investigating a few materials, but I'd like more background on how other…
Chthonus
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Can air suction be increased by consecutive pc fans in small air tunnel?

I want to make a small air filter using standard axial pc fans in order to suck smoke like that have been produced in soldering process. But I assume filtering will make it difficult. Am i wrong? The air have to be forced through the granulated…
Alnus
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What kind of simplified structural system would a Leonardo bridge use?

What kind of simplified structural system would a Leonardo bridge use? I've tried approximating the system to a simple statically determined beam (see below) but our calculations did not give any realistic results. I believe it is due to a…
JLenz
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How to measure turbulence parameters experimentally?

When running CFD simulations with turbulence on, I often need to specify inlet parameters such as the turbulent intensity, turbulent viscosity ratio and/or the turbulent length scale. If these parameters are already known for a given experiment, I…
Paul
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Rule of thumb maximum flow velocity of water in pipes

I have come across various values for maximum flow velocity of water in pipes. At university we were told that 2 m/s is the upper limit where flow becomes turbulent. In various planning reports I have read recently, 1 m/s is stated as the upper…
SlydeRule
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Advantages/Disadvantages of two-bladed windmill?

The vast majority of wind turbines I have ever seen feature 3 blades, as shown here: Recently while driving through western new York state, however, I passed by several turbines featuring only two blades, as shown here: What advantages and…
Timpanus
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What's more energy efficient: fewer air conditioners working at max capacity or more working at part capacity?

The central heat and air in the house I'm renting is unable to keep the house below 80 °F during the hot summer here (100 °F days). We've had 3 HVAC techs out to look at it and they all say there's "nothing wrong with the system" and that it's…
Dennis
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How can I add roof-mounted solar panels to a van without making it unstable at highway speeds?

We have an extended Chevy express with a 24" high-top, on which we intend to install roof-mounted PV. I'm really concerned with how to properly install the panels. We've selected six 100 W Renogy panels and a 400 Ah LiFePO4 battery pack, but it…
Liandri
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When are overshooting controllers preferred over asymptotic ones?

Disclaimer Designing the behavior of controllers is an important task for many applications. Every application needs its own requirements fulfilled. For example a CNC machine needs a controller with a strict asymptotic convergence to the set value.…
solid
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Is steel air (argon) tight?

I need to build an air tight system that can hold gas (Argon Gas). I see that most pipes use steel. Is steel tight enough to hold that gas? Argon is very dense, so I think it should have no problem.
LostPecti
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Gate width calculation for Passenger car design vehicle

I am trying to figure out the minimum gate width required for parking a car inside the house which has a 15 feet road in front of it. Please refer to the image below: Plot is 20 feet wide. I have assumed 6 inch wall and 2 feet X 2 feet columns.…
Whiskeyjack
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Steel vs Bamboo strength types/ weight and in various directions & orientations? Specific, Tensile, Compressive, Shear, Lateral etc?

Why bamboo is the ‘green steel’ of 21st-century Asian architecture Bamboo fibre is stronger and cheaper than steel, says Dirk Hebel Carbon Fiber Vs Steel Vs Aluminum Vs Bamboo Pros and Cons Is bamboo stronger than steel? How are their comparative…
Alex S
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Can concrete lose strength during curing?

We cast a bridge's concrete deck and kept samples for concrete strength tests at 7 and 28 days. We took a test at 7 days, and the test result were over the design strength (designed for 30 MPa, result was 33 MPa). The control engineer insisted that…
Murat Dal
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What is 'No Detent Torque'?

I am learning about Variable Reluctance ( VR ) Stepper Motors. As stated in my reference, they "have no detent torque." What does this mean?
Ciambro
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Are there solutions for coupling a spline shaft to a round diameter shaft

I only have basic metal fabrication tools and do not own a mill or a lathe, but would like one. I took apart my cheap drill press to study whether or not I can convert it into a milling machine. The spindle features a 4 tooth 9mm x 9mm tooth male…
user148298
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