# All Questions

12,677 questions
Filter by
Sorted by
Tagged with
14 views

### Is this kind of steering possible?

I would like to build a small robot and was wondering if a particular configuration of steering would even be possible and stable. What I would like is to have the two rigid axles mounted on a ...
9 views

### For a particular process the mean value is 1.832 and the standard deviation is 0.021 Find the percentage of the population that is greater than 1.85

Answer Choices 0.0228 0.0509 0.0831 0.1151 0.1448 0.1717 0.1959 0.2169
16 views

### How does Laminar and turbulent boundary layer develop

How does the laminar flow along a surface like a plate develop into turbulent flow please? I don’t really see how it does as flow over a plate wouldn’t really interact much? Also would roughness ...
21 views

### What Is The Rectangular Pipe Structure/Loop Constructed To Reduce HighRise Water Supply Pressure DownStream From Roof Tank?

This Pipe Loops installed in series downstream from highrise rooftop storage tank should serve to reduce Water Pressure supplied to lower-floor households. I tried all kinds of Google Search terms, ...
16 views

### Mathematical model of an hydraulic jack

How to find a mathematical model of this hydraulic jack system? I'm confused about the part when the piston extender, check valve 1 opens and check valve 2 closes, then liquid from the bottom tank ...
13 views

### Why does a metastable state eventually resolve to a stable state?

I was studying with a book named "Digital design and computer architecture". When I read the part of metastability, it stated this without any additional explanation.. Why does a metastable ...
16 views

### Are all boost converters isolated?

I have a few boost converters(3-6V to 40,000V) and I want to connect them serially. link In order for them to be connected, they have to be isolated. Is there any way to check that? If they aren't ...
16 views

### Best software for parametric design of foldable piece with rigid and elastic parts

I'm trying to create a parametric model of a container, using similar joints as this foldable bathtub. I do not need stress simulation, but need to see if my model can actually fold the full range of ...
51 views

### Can someone explain how houses burn down?

When I look at houses, all I see is concrete and cement blocks, nothing seems flammable, yet house still burn, why?
88 views

### Solutions for a slanted roof

I'm using I-Joists to span this 27' vaulted living room and create a shed style roof. I've got two problems. Because of the angle, the joist won't make full contact with the walls (short of 20 years ...
41 views

### How can Tesla battery packs be so small?

According its Wiki, a Tesla Model S battery pack can accumulate 100 kWh energy. The wiki page of the LiON batteries shows a 100-265 kWh/kg specific energy, and this source shows a Tesla battery pack ...
25 views

### Isn't the Newton's cooling law for heat convection too macroscopic for CFD simulations?

In CFD (Computational Fluid Dynamics) simulations, the space is discretised into a huge number of tiny cells and, therefore, one has the opportunity to use a model of heat transfer that takes into ...
16 views

### To show the dependancy of bend coefficient upon other factors

How can we show that the bend coefficient depends upon other factors using Buckingham pi theorem?
94 views

### Aluminium Bolt in Titanium Casing: Any Dangers of (Contact-)Corrosion?

Assumed we have a fuel flask that is made of titanium. The bottle will be filled with white gasoline when used. At the bottleneck there is a standardized thread manufactured into the titanium. Are ...
26 views

### What is topological distortion?

I understand the view confusion and struggling to understand topological distortion. I read from this website that the points of the plane that is parallel to the view plane and also passes through ...
17 views

### First Angle Projection in Engineering Drawing [closed]

Draw a first angle projection with a new front elevation of a support in the direction of the arrow and plan.
35 views

### Are old popular mechanics plans often bogus unbuildable projects?

I just viewed an interesting build of a 20-ton arbor press on YouTube based on plans published in 1972. From the video it is evident that this is very hard build. The guy uses a lot of heavy duty ...
22 views

### Die springs for heavy 3d printer bed

I have a 3d printer with a pretty heavy bed. Its dimensions are roughly 24"x24" & 0.25" thick Mic6 aluminum. I need to get some springs for the bed leveling, but my system requires ...
124 views

### How to visualize angle of projection in Oblique Parallel Projection?

We know that in Oblique Parallel Projection Point $(x,y,z)$ is projected to position $(x_p,y_p)$ on the view plane.Projector (oblique) from $(x,y,z)$ to $(x_p,y_p)$ makes an angle $\alpha$ with the ...
35 views

### Convert from mm of water to Coefficient of pressure (Cp) [closed]

Okay, I have this value in mmH2O (2.650) and am not sure where to go next to convert it to aerodynamic parameter pressure coefficient please? mmH2O * 9.8066 = N/m2 ???? What do do next please? I ...
31 views

### What is this welding tool in this video?

https://youtu.be/w6aUzGaXShQ?t=135 At time 2:15, what's the type of the welding tool he uses? I have read a couple of types for welding tools but I cannot see it matches any type.
124 views

### Reinforced concrete by steel, poor durability, why?

I've been reading up about reinforced concrete, as it is one if not the cheapest way how to build (with some solid foundation). I found out that it actually has quite poor durability (50-100 years or ...
24 views

### Is Lift-tig welding the same as lift-arc welding?

I am a completely new not-even-started starter in welding. I would like to know is Lift-tig welding the same as Lift-arc welding? If not, what are the differences?
33 views

### Is it 8 kHz the minimum number of samples per second and can that be written into a sound player?

If someone wanted to reproduce a sound without any electronics in a small space and using a finger nail could it be possible? For example there are roads that have sounds embedded in them that would ...
8 views

### Interpreting G code for cutting operation performed by CNC Lathe

I have a question about the following problem assigned as part of a manufacturing course. ...
11 views

I am working with an LED spec sheet and would like to calculate the irradiance vs the viewing angle. The relevant data given is the following: Radiant Flux: $\Phi_{e} = 1930 mW$ A relative radiant ...
22 views

### Design for manufacturing course as part of Mechanical Engineering program

I am taking a Design for Manufacturing course and I am unclear on how to use the Lucas, Westinghouse, and Boothroyd methods for Design for assembly (DFA) analysis. I have difficulty, for example, ...
15 views

### How to calculate the actual COP of a compression for a given outdoor temperature?

Given a chiller having a nominal COP value, how can we compute the actual COP for a given outdoor temperature. In this regard, is there any difference between compression chillers and absorption ...
19 views

### Vapor deposition of 5um Beryllium onto 0.5um mylar

I am searching for a service that allows the deposition of 5 micron thick Beryillium onto half micron thick mylar for a R&D project I am doing. I am having a difficult time finding such a service ...
64 views

### Q: Could you siphon an 10 meter tall water column?

This question might be better suited for this stack. In the physics stack, I posted about a question about siphoning. https://physics.stackexchange.com/q/677102/259268 An 10 meter tall cylinder is ...
6 views

### How do 3 different gen kVA ratings Service Load (maximum), Service Load (continuous), and "Motor Starting kVA (Max.) relate to the nameplate value

I'm reading an engine generator parameter schedule that has three different kVA values listed. The standby generators have "Service Load (maximum)", "Service Load (continuous)", ...
34 views

### Is a Tesla Valve a good fit for this requirement (prevent heavy load accidentally crashing downard but less restriction otherwise)

I want to design a hydraulic platform that allows/ensures: The GRADUAL DESCENT of a heavy load (e.g. a FULL shipping cargo container) from a height H1 to height H2 (where H1 > H2) - without the ...
35 views

### Peristaltic pump - theory vs reality, where is a problem?

I'm building a test system (experiment) for peristaltic pump to check if pump is able to pump according to specification. The pump data: 6,3ul liquid moved per stroke. 5 strokes per revolution. The ...
32 views

### How to mount a raspberry pi case above an analog thermometer dial

I need help with ideas on how to mount a case, that contains a Raspberry Pi zero and a camera, over an analog thermometer dial (see photos below). Additionally, there will be a power bank, as well, ...
25 views

### Does this elevator door operator mechanism solely rely on the door weight when the timing belt opens the sword clutch?

I have replicated the mechanism shown in this video (https://www.youtube.com/watch?v=4J1ohfeAE9Y) as a miniature DIY project, but my replica slider that is supposed to carry the door later moves with ...
29 views

### Is there a good way to passively dry air in the input of a vacuum pump?

I'm using an a/c compressor as a vacuum pump for small projects that don't need a good vacuum pump, and I'm looking for a way to dry the air in the input, to prevent water from mixing with the oil ...
17 views

### Everyday examples of hydraulic pressure drop generating heat

I'm interested in hands-on examples of voltage drop in electronics dissipating the energy as heat, and, thought that the hydraulics analogy, that is the same thing, might be a good way to intuitively ...
25 views

### How to design a fridge / freezer / air conditioner / heat pump?

I have this question / problem in my mind for an estimated of ~20 years. Obviously, my life does not depend on the solution, but the quality of the life of my brain might get improved :) Shortly: How ...
400 views

### Are un-dimensioned orthographic views permitted on a standard drawing?

If I remember correctly, best practice on a drawing is if you fully dimension a part in two out of three orthographic views you don’t include a third view with no dimensions. Is this a documented ...
49 views

### How to estimate the number of elevators required in a building?

I've been asked to estimate the number of elevators in a mixed use building with 37 floors (4 basement-parking floors), & design their operation. Are their any specifications/guides/manuals that ...
44 views

### If a building could support its own weight when laid on any side, would it be earthquake proof?

One source (see pg. 13) indicated that designers began with a rule of thumb in which the building should be able to withstand 10% of its weight applied laterally: In early days of designing buildings ...
17 views

### What is different between Hill frame and LVLH frame in satellite? [closed]

What is different between Hill frame and local-vertical, local-horizontal (LVLH) frame in satellite? I add one figure to show this two frame. reference of figure: Weiss, Avishai, Uroš V. Kalabić, ...
27 views

### What are the limitations or disadvantages of precipitation hardening treatment for alloys? [closed]

Based on Figure Q1, illustrate how to design and realize a heat treatment-based strengthen hardening for A-B alloy (e.g., the composition and heat treatment parameters, etc.), and discuss the ...
28 views

### Who takes care of structural health monitoring of civil structures?

There are numerous studies about the possibility of structural health monitoring (SHM) of tall structures, like bridges, skyscrapers, water towers, wind turbines, where, for example, inclination or ...
19 views

### Is there any way to quantify the rate at which pressure is relieved in a reactor?

If a pressure relief valve is open, is it somehow possible to quantify the rate at which the pressure in the reactor will decrease?
42 views

### Will the material plastically deform or fail when heating or cooling?

You have a stainless-steel rod with constraints on both ends that is held rigid. Initially, it is at room temperature before getting heated to 300 Celsius. Then, it is cooled to room temperature again....
51 views

### Boundary layer about to separate

I'm performing a study on a boundary layer about to separate with the method of Thwaites (the theory can be found here https://dokumen.tips/reader/f/viscous-fluid-flow-frank-m-white-second-edition-...
19 views

### multiple sequencing circuit for sequence A+B+B-C+C-A- by Cascade method

I am learning pneumatic circuit and i came across this problem of Designing and draw the multiple sequencing circuit for sequence A+B+B-C+C-A- by Cascade method for the Pneumatic system. the sequence ...
I work for a quartz resonator manufacturer, and we specify the parabolic temperature coefficient as Δf/f_o = -0.0340±0.006ppm/°C² The units on $\Delta f$ (the ...