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1500 questions
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3 answers

Cutting flattened out "threads" to prevent small-scale slipping

I have a product where we transmit quite a lot of shear force through a small bolted join. On our current design the contact area is about 10mm², the bolt is M2, and the force is 45N, and it works quite well. But now we want more, the requirements…
Jack B
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How many decimal places of GPS should be stored to be accurate within a few feet?

I'm building a software application that uses GPS for a purpose related to roads. I'd like to know how many decimal places of GPS data should be stored to provide measurements that are accurate to within a few feet?
noɥʇʎԀʎzɐɹƆ
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Could a Fuel Breathing Engine Rather Than an Oxidizer Breathing Engine Work?

Here on Earth, the atmosphere is ideal for jet engines which combust a fuel using the native oxygen as an oxidizer. On another planet, might it make sense to carry oxidizer in the fuel tanks and scoop the fuel from the air (assuming the planet…
Rafael
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Mounting a pcb at a different angle than mold direction

We have a problem with mounting a PCB at a different angle than the mold direction angle. I have graphic below to help explain. If we were to build standoffs at the same angle as the mold direction but we need that PCB to be 90 degrees from the…
Tim T
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How does infill material affects the capacity of a tubular section with H-section inside?

How does one consider the moment capacity of a combined pipe plus H-section if the infill material is: Sand, friction angle 30 degree Grout, C20 Concrete, C45 Eurocode has a section on composite design, which requires use of shear connectors.…
Jennifer
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Laser Cutting backing material instead of grid?

My research group recently purchased a 40W CO2 laser cutter. We work in the biosensing field and some of the materials we wish to cut are very thin nano/micro fibers that will be cut into relatively small pieces. When cutting the material we hope to…
Nick Law
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Is radians a dimensionless quantity?

Quite often while calculating angular velocity we come across the quantity radians per second. How do I treat radian dimensionally?
Rajorshi Koyal
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Holonomic constraint forces using Lagrange multipliers

Consider a multibody robotic system with Lagrangian $$ L =\frac{1}{2} \dot{q}^{T}M\dot{q} - V $$ and equations of motion of the form $$M(q)\ddot{q}+C(q,\dot{q})\dot{q}+A^{T}(q)\lambda+N(q)=0 $$ where $N=\frac{\partial V(q)}{\partial q}$ and…
Leo
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Tower crane with lift (elevator)

Near my apartment is a building site with a tower crane; great fun to watch of course. This crane seems to have a lift / elevator / vertical-people-transporter (arrowed in the picture). As far as I can see the lift is only used four times a day…
NL_Derek
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Is it possible to make very large diamonds using a pressure vessel at several GigaPascal pressure?

Nanocrystalline diamonds can be synthesized by direct conversion of graphite or carbon black mixed with low amount of boron (0.1%-10%) at 8-10 GPa, according to US patent No.20120255236. If some scientists decided to make very large monolithic…
anameen
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dSPACE compiler linker error -- fscanf undefined

I'm dealing with a somewhat intractable problem. We're running dSPACE 7.4 (RTI 1006) on MATLAB 2011a, which I understand uses the dSPACE DS1006 C Compiler v. 2.2. When I try to compile one of our models, I wind up with a linker error claiming that…
ZStamler
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How do we specify among a shim, spacer, and washer?

Our small radio-control model cars have shims, spacers and washers. I am tasked with clarifying the manual and getting parts naming consistent. We have these items from less than .5mm thin up to 1/8" thick. I'm thinking of calling everything under…
Steve
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How they put heavy cranes on top of the building?

I saw crane on very tall building. How do they put such heavy item on such high building?
The Hawk
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Longitudinal impact of steel rod on a steel plate to verify the contact duration

So I'm doing an experiment to verify the contact duration when a steel rod (Material: Mild Steel) is allowed to free fall longitudinally on a steel plate. The arrangement is real simple: The rod is allowed to fall longitudinally on the plate,…
Aswin James
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Why not design a Wind Turbine like an Anemometer?

Anemometer measures wind speed. It's shaped with little cups---hollow half-spheres. That looks very logical as the cups grab the wind and the other side is rather streamligned to cut through the air as it spins. So why are there no wind turbines…
DrZ214
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