# All Questions

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### Finding the name of: Mechanical toggle actuator utilizing single direction of force (pull only/push only)

Preface: I have no formal experience in design or mechanical engineering. I am simply a backyard mechanic looking to see if a particular assembly exists as an off-the-shelf product before designing ...
15 views

### What is the difference between an alloy and a metamaterial?

Metamaterials are carefully structured materials — often consisting of periodically arranged building blocks — that exhibit properties and functionalities that differ from and surpass those of their ...
• 1
5 views

### Get the video stream from a microscope camera Zeiss AxioCam

I have a Zeiss AxioCam ICc5, connected to the PC with Firewire IEEE1394. How to get the video stream, or individual image frames from C, C++ or Python code? For example in Python, will it be ...
• 101
11 views

### How did horizontal progressive collapse occur in 7 World Trade Center?

Please try to avoid associating this question with baseless controlled demolition theories I suppose the former 7 World Trade Center and it's fate does not need an introduction. The progressive ...
• 157
33 views

### Why aren't fasteners open standards?

I just wanted to find information for an M2 flat head hex socket machine screw which, I believe, is defined by ISO 10642, but unfortunately that is locked behind a paywall of a couple hundred dollars. ...
• 101
20 views

### Does "stacking" of thinner timing pulley and belts reduce "belt stretch", as using a wider belt would?

When wanting precise belt driven motion, it is desirable to reduce belt stretch by using a wider and/or stronger belt. Wider GT family can be quite expensive (hundreds of dollars) compared to thinner ...
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1 vote
91 views

### converting air flow rate between l/min to kg/s

I am calculating the air mass flow rate in kg/s for air in a numerical model, and i want to compare the results with an experimental investigation, the flowmeter unit is l/min. how can I convert l/min ...
34 views

### Best way to deploy a projector screen from the bottom?

I want to design a system for an electronically deployable projector screen, where when not in use the screen is stored at the bottom and there are no structural elements sticking up significantly, ...
41 views

### How to create a friction-based cable exercise machine?

What would be the best mechanism to create a friction based cable machine? The point of this machine to only have resistance to movement not when the cable's stationary and without the momentum of ...
46 views

### How are subsea HVDC cables laid without cutting internet cables

Apparently subsea HVDC cables are actually buried around 2m below the sea bed using some kind of plough-like device. How can that be done without cutting internet cables?
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22 views

### To reduce friction losses, is it better to have one single large ratio stage, or multiple smaller stages for worm gear?

If I wanted to have a 49:1 total reduction, would there be less friction losses with a single stage of a 49:1 or two stages of 7:1 and 7:1? Google has not been much help. My gut says that I should use ...
• 1
25 views

### What materials can be used to make press and blow moulds for glass manufacturing?

Would any types of 3D printed plastic be strong enough?
1 vote
16 views

### Replicate loft-based object to value-driven object

I've made the following oddity in Solidworks: All the dimensions are known except for the top part. This is probably because this was done using the Lofted Boss/Base feature. The Loft profile goes (...
• 385
22 views

### In the Rankine Cycle, how does the condenser work without changing the temperature or pressure of the fluid?

The condenser changes the state of the fluid from a saturated mixture to a saturated liquid by rejecting heat, yet the process occurs isothermally and isobarically. How then does it manage to perform ...
17 views

### What should be the R value of insulation for charcoal kiln?

I am operating a charcoal kiln. The temperature of the kiln can reach around 800°C. What should be the R value of the required insulation? The outside temperature is around 30°C.
14 views

### 3D printed titanium durability/material quality concerns

What is the material strength of titanium 3D printed parts....compared to cast or machined parts? also how do they bond the individual pieces?
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1 vote
45 views
+50

### Influence line question for calculating maximum bending moment

I have the following question: I have no trouble drawing the influence line but I have problems with finding the magnitude. Can someone please explain how to get $\frac{8}{3}$? How should I use the ...
• 226
8 views

### Square box welding with T joint, welded with stick welding

When joining two square box beams in Tee, is it enough to weld them in only three sides or I have to weld the full perimeter of the square? If those 3 sided weld are suppose to bear weight, how much ...
10 views

### Finding conditional PDF of quantization error if there is bit error

I am studying for my telecommunications final and I came across a problem asked in a previous final whose solution does not exist. I am not going to share all the details of the problem as this might ...
30 views

### Is there any way to relate the induced EMF from an alternator to the DC current that is used in the field winding?

I'm trying to simulate the open circuit saturation of an alternator. Basically, by changing the amount of current that is going through the field windings (rotor), the voltage induced in the armature ...
55 views

### Best material to prevent stainless steel wire abrasion (polyamide coated)

I have a 1.5mm diameter wire that must be pulled against the corner of a surface. The wire is made of stainless steel and coated with polyamide. What is the ideal material to make corner of the ...
• 165
29 views

### Working of planetary gear set in electric bicycle

For mid-drive electric bicycles where the motor is attached to the pedals, it provides helping torque which reduces the force that needs to be provided on the pedal. So, how does a planetary gear set ...
19 views

### Gravitation Potential Energy on Sector Gears

Find an equivalent spring stiffness for a system using Energy Methods. The problem is, I do not understand when gravitational potential energy should be taken into account. Let's see the examples ...
• 3
60 views

### How to Determine a Valid Relationship Equation Between Two Finite Datasets -- Python, Matlab or Other [closed]

I struggled to find a clear solution online so I'm resorting to asking a fresh question. I have two finite datasets (call them 40x1 vectors) that are equal in length and generate non-linear curves, ...
41 views

### Shifting Between Gears To Achieve Higher Acceleration

If the car's acceleration is higher when the wheel's angular acceleration is higher(tangential acceleration=alpha x radius). Why are higher gears not used to accomplish the acceleration of the car ...
35 views

### How to get difference equation from this block diagram

I was posed a very similiar block diagram in my exam from this book (Alan V Oppenheim Ronald W Schafer - Discrete-Time Signal Processing-Pearson Education) but couldn't solve it: I want to solve for ...
1 vote
41 views

### Calculating torque in planetary gearbox

It's my understanding that in a planetary gearbox, force moves through the system via four mechanisms: the ring gear, the planet gears, the planetary carrier, and the sun gear. I'm trying to ...
33 views

### In which file format are technical drwaings saved/stored? XML? How can the data be exchanged between other software?

I just want to know how the information contained in technical drawings is stored? Is there a kind of major representation/file format such as the boundary representation? Is all the information ...
• 169
34 views

### Electric Standing Desk

So, I'm trying to build an electric standing desk for myself. I drew what I have in mind as a guideline for my questions here. Basically I want a desk that varies in height from 65 to 130. I imagined (...
5 views

### Attenuation along microstrip

I just wanted to know why signal attenuation decreases with length across a micro strip transmission line. Isn't it meant to decrease but experiments show otherwise.
1 vote
47 views

### In a AWD Tesla Model 3, why is the front and back motor different?

In a AWD Tesla Model 3, why is the front motor (OEM 1120960-00-E) different from the one in the back (OEM 1120980)? Why not just use the same one for both front and back? I'm sure that there was a ...
30 views

### Inaccurate flow rate measurements of an engine diesel fuel due to change of its viscosity

I am measuring the volumetric flow rate of a diesel fuel using "Turbines" flow meter, both in the supply and return fuel lines of an industrial diesel engine (Caterpillar 3512B – coupled ...
• 3
100 views

### What are the differences between a standing wave ratio meter and a frequency counter?

Im having a hard time understanding what the differences are, I see things on google saying they are both at once and I am really confused.
33 views

### Is the effect of weight-to-horsepower ratio linear?

I am wondering if a car that weighs 2,5kg and a engine power output of 1hp would be just as fast when going in a straight line like a 1250kg car with 500hp (they both would have a weight-to-horsepower ...
1 vote
43 views

### Natural Frequency of a Shear Frame

Hi I've been stuck on a problem for one of my exam revisions, we were asked to identify the natural frequency of the following structures I know that the equation for the stiffness is as follows Left ...
17 views

### What contributes to the energy cost of multistage compression at high discharge pressures?

I'm getting into hydrogen compression from a theoretical point of view and am looking for a model to describe the energy requirements. I've gathered, that hydrogen is often compressed with piston ...
• 1
124 views

### Mounting an electric motor to a transmission: how to measure

I'm trying to fabricate parts to mate an electric motor to a manual car transmission (although, I think this is a more general question). I need to connect this: To this: Like this: The approach I'...
• 121
12 views

### Powring an american welding machine 16A/230V two pin plug in the UK? [migrated]

I bought a Sherman™ DIGITIG 200GD from Amazon a month ago, sadly it came with an american 16A/230V two pin plug I've been so focused on making sure to meet stringent safety measures for my humble &...
23 views

### Are EC gears possible to machine in metal with conventional methods?

See https://www.ec-gearing.com/. I'm wondering if it's possible to CNC machine / mill this at all with very high accuracy.
13 views

### Need a solar powered mechanical motor? that moves a leaver up and down low force and little distance on day/night

I'm planning to use barrels full of water to make a drip watering system. I can make the water controls from a pretty easy toilet fill&flush valves and balance it so it needs a very light push on ...
26 views

### What's the minimum torque needed for 2 DC motors for moving a 1 kg object on top of them?

I have a weight of 1 kg and I want to properly choose 2 DC motors for them in order to be able to move the 1 kg of weight with variable speeds in the range of 0 to 1 m/s with an increment of 0.05 m/s. ...
41 views

### What kind of stress can forged aluminum take?

I have a motorcycle frame. It is made form forged aluminum. There is a pressed headset in the frame that I need to remove - it was pressed in there with machined force. Some folks remove the headset (...
27 views

### Need help with Solidworks

Would I be allowed to ask which Solidworks feature I should use to make the recessed bit (circled in red) of the thing in the diagram below? Thanks.
16 views

### Cutting method, where shaving stays attached from one side

Usually shaving goes out in front of the tool, being connected only along the cutting tool width. Im interested in another case, when shaving is moved to one side and it stays connected to the ...
39 views

### At what refrigerant pressure does an air conditioner blow coldest?

R-134a refrigerant has recommended pressure levels to keep a system properly charged: My question is if you're trying to make an ac system as cold as possible, and you're willing to ignore potential ...
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35 views

### Is there a way to simulate the drag effect created by acceleration while in a stationary object?

There was a video of a train that had tvs in the windows so it appeared the rider was moving across the landscape. If the train was stationary the passenger would not believe the ride was real because ...
34 views

### Calculating the transfer function of this block diagram

I'm not really sure what steps to take to solve the problem. I tried with G4 and G2 first but I'm not sure if that is the correct way.
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13 views

### Mechanism and static determinacy

I was doing exam question and am confused as to how to determine if the structure is a mechanism or not. Say that j = number of joints, r = total number of reactions, b = number of bars. For both (a) ...
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105 views

### Why do air-to-air missiles have tail fins?

That sounds like a stupid question but hear me out. For something like a rocket where the goal is to fly in a straight line the use of the tail fins is obvious. But air-to-air missiles are designed to ...
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