# All Questions

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### Are ceramic materials suitable for making locking lugs for guns?

Since ceramics are resilient to shear loads, could one make locking lugs in a gun out of them or will tensile loads also be present leading to failure of such lugs? Also, could those tensile loads be ...
5 views

### how can I solve this error in c++: Exception Unhandled?

I am new in learning C++. I have used this code to show an image, but there is an error that I do not understand! This is the simple code: include iostream include conio.h include opencv2/core....
9 views

### Question about flow temperature and storage temperature in a cogeneration plant

Let's assume I have a cogeneration plant that produces heat with a nominal output. The heat is given into a heat storage tank, which is filled from above. The maximum flow temperature of the ...
8 views

### Is it possible to have the load cell signal as feedback to the servo drive of the servo motor?

In my project, I have to control the linear motion in one of the two modes. It will be either position control or load control. for the displacement control, The servo motor takes the quadrature ...
6 views

### Unrestricted Cockswain

Hello I am researching first millennium BC Nile freighter rudders. They sailed upstream and came back down with the current. The Greek writer Herodotus tells us that going downstream they were towed ...
7 views

### Finding exit velocity from a compressed CO2 canister

I’m trying to find P3 and v3 (exit velocity and pressure) to plug into a CFD simulation, but I’m having trouble finding v2 and P2 (velocity and pressure before the valve). I’ve looked online and many ...
7 views

### Where can I find a list of building codes to put on a set of blueprints for a addition

Most architectural companies have a template of blueprints they reuse for every project. As an owner-builder, I need to make these blueprints from scratch On page 1, I have to list all applicable ...
12 views

### Linear Motion Ratio on Eccentric Cam Pulley

If you have an eccentric pulley wheel and attach a rope to the top most vertical position and pull downward, the point at which the rope is fastened inscribes a circle with the radius of the distance ...
15 views

### Calculating flow rate of compressed air to push another liquid out of a tank at a desired flow rate

I am working on a system for a university project which uses pressurised air to eject the contents of a tank through a pipe into the atmosphere. I am working on figuring out the flow rate and pressure ...
18 views

### Bendable flaps on sheet metal

I'm trying to cut some bendable flaps on aluminium sheets for hooking/clipping onto some fabric. The flaps I have in mind look like this: Are these common features? Does anyone know the geometry of ...
15 views

### Drained and undrained shear strength of clay correlated?

When we measure the undrained strength of clay via CPT or triaxial test for instance, is there a way to correlate this to drained strength? How? I ask because measuring drained strength takes very ...
12 views

### Can a motor work within the center of another motor without magnetic interference or confliction on the rotors?

I'm imagining if it's possible to design a motor within another motor without having the magnetic field produced by one interfere with the other or their effect on the rotors conflicting? Can it be ...
21 views

### How to constrain stepper motor inside case?

I have a stepper motor linear actuator assembly like this for example, but the stepper shaft seems able to move axially back and forth - hence when I change direction it has to do a few rotations, ...
22 views

### Help with linear rod drill press like design/materials

I am putting together a basic machine for “pad printing” extremely small and precise parts. The design is very much the same as most homemade drill presses and consists of linear rods, flanged ...
28 views

### How do I to connect aluminium profiles with 60 and 120 degree angles?

I would like to construct an aluminium profile frame which includes connections with stiff fixed angles at 60 and 120 degrees. What options do exist for creating those connections, preferably without ...
24 views

### Latest simulation software to design motorcycle

Manufactures do a lot of research into finding where exactly where they want the centre of gravity to be based on the weight of the engine and fuel tank. To make ...
13 views

### Is it possible to grayscale a MPO file (3D camera) for a CNC carving

I had/have a 3D camera back in the day, and I gotten a few pictures. I kinda stopped using it since there wasn't anything I could do with the MPO files. However, the camera might gain a new life if I ...
16 views

### grey cast iron from freezing point to room temperature (cooling process)

Do grey cast iron expand from freezing point to room temperature (cooling process)?
17 views

### Trim parts against parts in assembly level solidworks

In solidworks , is it possible to trim a part against another part in assembly level
36 views

### Forces on pruning shears

I am trying to find the forces in hinches $B$, $C$ and $D$. The exact solution is not important for me. I introduced the following internal forces to solve the problem: $A_y$ in $A$, $B_x$ and $B_y$ ...
29 views

### analysis of PD controller vs static-gain

I have a plant $G(s)$ which gives position and velocity as output $$G = [G_{ru}(s)\quad G_{vu}(s)]^T$$ where $G_{ru}$ is the integral of $G_{vu}$, and $u$ is the input to the system. Now if I want ...
18 views

### I need a mechanism/method to control a shaft that can rotate at different speeds. (faster clockwise and slower anti-clockwise)

I need to develop a mechanism - Where in I have a shaft that needs to rotate at different speeds. Lets say at a higher RPM clockwise and a lower RPM anti-clockwise. This shaft is attached to my ...
16 views

### How do nuclear power plants prevent fuel rods from depleting nonuniformaly?

Power output of nuclear reactors is controlled by control rods that sit in between the fuel rods: These are pulled out to increase fission rates - and lowered to decrease them. The control rods are ...
21 views

### How many columns per row did the Lorenz cipher teleprinter machines use?

"The Lorenz SZ40, SZ42a and SZ42b were German rotor stream cipher machines used by the German Army during World War II." I've been trying to find some details about the "specs" of these machines, or ...
19 views

### Reliability vs complexity of engineered systems vs biological systems

This is a little bit of an open ended-question but I was trying to get more insight into this. Generally, in engineering simpler systems tend towards reliability more than complex systems because ...
16 views

### How to furnace-melt bismuth oxide into optical glass?

I have been experimenting with a furnace at my house and am looking to attempt the more difficult process of creating bismuth-oxide based optical glass for the purposes of creating optical elements (...
17 views

### How to modify Airfoil thickness

I'm writing a fusion360 adding to model windmill blades. My first goal is to model the NREL Phase IV in which the airfoils (S809) definitions come with thickness and also span station (wich I¿dont ...
28 views

### Can I submerge a pneumatic cylinder in oil?

I am looking for a linear pneumatic cylinder to raise and lower a fixed object. Everything will be submerged in oil (for electrical purposes). I am new to engineering and pneumatics in particular, and ...
57 views

### How do I determine what hardness to change the bearing or the track?

We have a project that requires us to use a qty of 4, Ø2" yoke roller bearings mounted two per side on a trolley that roll on a steel track. The maximum total weight that we estimate on the track at ...
34 views

### Is there a standard formula available to calculate lateral concrete pressure from the measurements of lateral concrete strain?

As shown in the image, I have done a vibrating wire type strain gauge and pressure cell (not shown in the image) instrumentation on full scale form. the objective is to measure the lateral pressure of ...
34 views

### Using gyroscope to calculate forward kinematics

I want to measure the end-effector position of the robot that I attached. I'm using both gy-25 and gy-521 for calculation of the angle. As shown in the picture, joint 1 has 2 DOF, one for spatial ...
9 views

### How to calculate the thermodynamics properties of the LiBr/H2O solution?

When modelling an absorption heat pump cycle one would need to calculate the state properties of absorbent, absorber, and the mixture of these two; in order to find out the cycle properties. Is there ...
66 views

### The Cavitation Problem

I'm new here and would like to ask where the cavitation would happen in my design. Thanks
28 views

### Convert Sankoo electric steam steriliser and drying machine to food dehydrator?

I have a spare Sankoo electric steam steriliser with drying functions and I want to convert it to a food dehydrator? Is this doable? How can I do it? It consumes ~150 Watt with the drying function ...
21 views

### Structural response and Reinforcement in shell elements when using SAP2000

Aqueduct is hydraulic structure compose of bottom slabs resting on sidewalls. Bottom slabs acts as one way slabs while side walls act as beam , as per our conventional design assumption. But when it ...
19 views

### How can I build a boot warmer? [closed]

I'm not going to build a boot dryer. Actually, I want to make a boot/shoe that is going to be warmed by the elements around the boot/shoe. At first, the elements need to be flexible because of the ...
42 views

### Why HMMWV's lights aren't located at the edges?

Hummvee has front lights located far from edges, closer to each other. That makes it harder to see edges of the vehicle in the dark.
32 views

### Can a Peltier's device (i.e.Thermoelectric cooler) achieve cryogenic temperature efficiently?

Does the stacking of peltiers device shows promising results in achieving the cryogenic temperature? I have tried doing the experiment, the overall temperature of the system increased around 80ºC and ...
19 views

### How do the classification societies define the load line convention on ships, how do they calculate it and mark it while designing?

Classification societies give the plimsoll line in ships but how do they calculate it while designing?
37 views

### Problem while solving for the moment of a cantilever beam

As in the first image, Moment at any point between C and B should be 0. But when I try to solve it by substituting equal and opposite forces at end C so that anti-clockwise moment of $F(l-a)$ and ...
26 views

### How to convert output of controller (control signal) into PWM signal?

I am trying to control a mechanical system with some transfer function T (output is position & input is voltage). I have implemented a state feedback controller in order for the output of the ...
71 views

### Using one electrical pump for multiple hoses

I'm currently trying to figure out a cheap way to build a cocktail machine. For now the machine should have about 20-30 possible input liquids. These liquids should remain in their original bottle ...
34 views

### How to add a controlled amount of a nutrient solution to a water line

I have an existing water supply system for the cattle on my farm whereby 6 troughs located in different fields are all fed from a common header line. The pressure in that line ranges from 3-5 bar (It’...
28 views

### torsion spring applicaiton

I wish to rotate a short cylinder (thick disc) by 150 degrees. I chosed to use a double torsion spring for this (as the picture below). The picture shows only one side. I wonder if the above design (...
24 views

### How is d(Cl)/d(alpha)@stall and Cl increment to stall defined in Xrotor?

Edit: Someone answered me in the original post overhere. ;) I hope there are some people around here with some experience in Xrotor than me. (Xrotor is:"XROTOR is an interactive program for the ...
51 views

### How do those “dipole-shaped” weights attached to sections of electrical power lines work?

I see these frequently on tall power lines like the one in the image below, sometimes a single one at each end, sometimes pairs as are shown here. Sometimes on one side of the tower but not the other. ...
12 views

### Demagnetize neodymium permanent magnets at < 60 degrees C

I have 10 cylindrical neodymium permanent magnets about 5mm in diameter, 5 mm long, embedded in a thermoplastic polymer. I want to demagnetize them without removing them, or heating them above 60 C ...
14 views

### Construct “Modal Coordinates Time History” from transfer function and test accel-time data

I have a query regarding the calculation of the so called “Modal Participation Factor time signal” from a combination of a) transfer functions (amplitude and phase for each eigenmode) obtained from "...
In my control equation, there is a term $$\frac{\partial \rho u}{\partial t}+\frac{\partial \rho u^2}{\partial x}+\cdots=\frac{\partial p}{\partial x}$$ How to discretize it in staggered grid? ...