All Questions
15,774
questions
0
votes
0
answers
16
views
FEA meshing of irregular geometry
I work on the simulation of sand particles and usually use tetrahedral free-meshing to represent their complex geometries for finite element analysis. I have recently spent some time looking into ...
0
votes
0
answers
9
views
Helicoil-Screw Torque Spec
My project incorporates the use of various metals and plastics to include ABS, G10, aluminum, titanium, and brass, and we drill and helicoil all mounting screw holes. I'm having a bit of difficulty ...
- 143
0
votes
0
answers
10
views
Velocity value in a pipe junction when we're applying the energy equation
I'm trying to understand how to apply the energy equation at a junction of 3 pipes. For example, when we are considering points A and D, should we consider that velocity at point D just before the ...
0
votes
0
answers
29
views
Kindly explain this graph which is related to internal combustion engines
Hello,
I am not getting this graph which is related to the Internal Combustion Engine.
0
votes
0
answers
36
views
Can the volume of fluid flow affect a strain gauge's measurement accuracy?
I have two machines for testing solenoids, one new and one old.
When a bypass is connected to both hoses (the input hose is connected to the output hose), I get ~1:1 for the input output pressure; the ...
0
votes
0
answers
10
views
Complete classification of lower kinematic pairs
During research I keep seeing the statement saying that all possible lower kinematic pairs can be classified into one of 6 types, those being:
Revolute
Prismatic
Screw
Cylindric
Spheric
Planar
While ...
- 1
0
votes
1
answer
35
views
How do I perform a lead of helix cut?
In this old blueprint from 1944, it calls for a lead of helix, 1 turn in .2" on red arrow:
No other info is provided.
This is a top view of the part.
Here's ...
- 127
2
votes
1
answer
149
views
How do I relate tongue weight to weight x distance?
The specification for car hitches routinely state the tongue weight, but do not specify how far that weight can/should be applied. What am I missing? Shouldn't the maximum bending moment be the one to ...
- 411
2
votes
0
answers
35
views
Are two solars panels more efficient than only one of twice the power output?
Is there any advantage to use two 50 W solar panels in parallels instead of one 100 W panel?
As we know, the effect of partial shadow on a solar panel can make the whole panel ineffective. We want to ...
- 21
0
votes
1
answer
34
views
Do cheap, low pressure (~0.25psi) pneumatic components exist?
I am working a design project (a bubble CPAP machine) for one of my classes and though the device is pretty simple, finding components for it is a nightmare. Essentially, a pump feeds air through a ...
0
votes
1
answer
23
views
Deformation Due to Material Removal and Residual Stress
Suppose I have a piece of metal (of arbitrary geometry) with some residual stress profile. I then remove a chunk of the metal and the piece of metal deforms (due to the residual stress). For ...
- 15
0
votes
0
answers
11
views
Checking if a Residual Stress Field Achieves Mechanical Equilibrium
Suppose I told you the Cauchy Stress Tensor at every point inside a chunk of metal. And, yes, I know this means that I would need to tell you about an infinite number of points - let's ignore that ...
- 15
0
votes
0
answers
11
views
Shaft Nominal Diameter for M16 thread
I am looking to machine a M16 thread with a pitch of 2mm on a shaft, but I am unsure about what diameter should that shaft be in order to achieve the desired M16 thread. Does this change depending on ...
-1
votes
0
answers
23
views
Steam turbine powered by hydrogen movement
Steam turbines already exist that generate power from the heat generated by the combustion of gases. Gas turbines and combustion engines also exist that can generate electricity from the combustion of ...
- 1
0
votes
0
answers
27
views
Are double universal (Cardan) joints exactly constant velocity?
Some double universal joints use a centering joint to ensure that the angle of the input and output are equal to maintain a constant velocity through the joint. From what I can tell, this centering ...
- 35
0
votes
0
answers
22
views
List of engineering jobs where particular attention to heat and heat hazards need to be kept in mind [closed]
I was wondering whether anyone can give me a complete list of jobs, whereby, people would be working, near, things, with extreme heat conditions, or next to things having extreme heat conditions.
Here ...
0
votes
0
answers
19
views
Creating a Multi-SIM Cellular Connectivity Solution for Raspberry Pi Zero 2 W
I'm looking to set up my Raspberry Pi Zero 2 W so it can use various SIM cards from different telecom providers. While this might sound unusual, it's actually quite practical. In some areas, certain ...
0
votes
1
answer
28
views
What's the best way to mount many clock hands on a custom clock?
I'm building a custom clock that requires 4-5 clock hands that need to move individually. I've designed it so the hand are to be mounted on telescoping brass axles (that have press fit gears ...
- 101
0
votes
0
answers
8
views
Is there a formula to calculate the dynamic factor Kv for a single stage helical gear set?
I want to optimise my gearbox for dynamic factor Kv=< 1.1
Is there any equation to do so in excel from the power input, the macro geometry, etc.?
- 1
1
vote
2
answers
42
views
Division symbol in welding proceedure
I am dealing with a European contractor, and often I see a division symbol (÷) in their documents, screenshot below. Could somebody explain what that means? P.S. Hope this is the right stack for it. ...
- 13
0
votes
2
answers
60
views
Connect two motors to different planes and rotate them on the same center point
I am trying to design a kinetic art sculpture. I want to rotate two independent planes at the same center point and control both their speed and direction independently. So I've found that having two ...
1
vote
0
answers
39
views
How to calculate Power Factor capacitors for welder
I have a 200 Amp AC welder and I am trying to figure out what the power factor correction capacitor should be. I ran some numbers but they do not sound right and I was wondering if I anybody could ...
- 1,000
1
vote
1
answer
22
views
Pumping water from under concrete slab basement
I have this situation, and wanted someone's opinion.
Info:
Concrete foundation basement, slab floor
Weeping tiles and a sump pump is present / operational
The house is near a pond.
Grading is alright,...
- 11
0
votes
1
answer
41
views
Profile and pressure angle definition in gear geometry
In gear geometry there are 3 main angles, which can be misleading:
Profile angle
Pressure angle
Operating pressure angle
Further for simplicity I would restrict the area of interest to "spur ...
- 3
0
votes
1
answer
42
views
One way bearings
I want to use one way bearings for a project, but there are some things I just can't figure out about them.
So I know that a one way bearing restricts rotation of an axle in one way and allows ...
0
votes
0
answers
26
views
6” hole in basement slab near fundation wall
Is it okay to drill 6” hole in basement slab 4-6” from the wall?
Will I hit footing and is that an issue?
- 1
0
votes
0
answers
47
views
The triangle of forces - Lami's rule
Hello there, In this question, I have to draw the shape so that I can solve the problem. I looked at the answer book and did not understand how to draw it. Can someone help me? Note that the answer is ...
0
votes
0
answers
19
views
Are "Tresca yield surface" a type of failure mechanism?
A non-rigid solid was given a x-direction point load, and von Mises yield criterion is used to check whether the solid would fail or not.
I was also asked: "(the previous question asks us to ...
- 133
1
vote
3
answers
56
views
Self Locking Brake Question
I've been staring at this problem for statics for quite a while now and I just don't understand it. The question states:
"The brake is to be designed to be self locking, that is, it will not ...
- 11
0
votes
0
answers
8
views
Maximizing Energy Efficiency : A Comprehensive Fluent Simulation Study for Optimizing Foster Wheeler ESD Boilers (I-IV) - A B.Sc. Thesis Proposal
How can Fluent simulation software be effectively utilized in optimizing the Foster Wheeler ESD boiler for my B.Sc. thesis proposal, and what simulation parameters and methodologies are recommended ...
0
votes
0
answers
9
views
Justification for choice of beam stiffness at pinned far-end member
I’m reading off an example provided by the ICE structural analysis book, specifically example 4.7 (moment distribution method) I dont seem to understand why the stiffness from member D-C is 4EI/L ...
- 1
0
votes
0
answers
23
views
How to determine minimum and maximum value of lateral displacement in Railway Equivalent Conicity Calculation
I am trying to calculate the Equivalent Conicity for railway application by referring to ...
- 43
-2
votes
0
answers
26
views
get the side view shape and the isometric view [closed]
get the side view shape and the isometric view from the plan shape and elevation
0
votes
0
answers
11
views
How to add compressor curve in Aspen HYSYS for a centrifugal compressor with IGV and only one efficiecy 65% is given in data sheet at 400rpm
I am trying to check the adequacy of existing centrifugal compressors in a gas train.
The adequacy check is required due to a new tie-in in an existing gas train inlet, from a new source of "...
0
votes
0
answers
15
views
Controls architecture for stepper drivers
I am working on a project which deals with a large number of stepper motors and other devices. A key feature I want to achieve is create a modular/ expandable system, so that new devices can be easily ...
- 1
0
votes
0
answers
10
views
Inductor calculations helper script and motor idea
I have an idea for a motor involving the use of a flyback transformer to recycle EMF in a custom designed pole-to-pole repulsion-attraction DC motor. I wrote a script to help with setting design ...
-1
votes
0
answers
49
views
What jet aircraft has the longest flight range? [closed]
What jet airplane has the longest flight range (without aerial refueling)?
There are four categories:
Special aircraft (e.g. experimental jets or unique airplanes (like the giant Antonov An-225 which ...
- 233
-3
votes
0
answers
24
views
material strength, [closed]
a hard steel cone having a semi angle of 82 degrees is drawn across the surface of a hard steel plate, having a hardness of 2000 MPa under a constant normal load of 120 N. Estimate the width of the ...
- 1
1
vote
1
answer
79
views
Benefits of a steel ball in janka hardness test
The Janka hardness test is a test used to measure wood's resistance to denting. The test involves pressing a steel ball that is 0.444" in diameter halfway into a piece of wood and measuring the ...
- 317
0
votes
1
answer
24
views
In a lead screw mechanism with a fixed travelling nut, will the screw and its driving mechanism move instead?
https://www.youtube.com/shorts/tUkkOStjz8o
Imagine this but upside down.
Since the platform bolted to the travelling nuts will be pressed against the ground and will have nowhere to go, I reckon the ...
-4
votes
0
answers
16
views
How do you ensure controls are put into place once a product is no longer a prototype [closed]
What will be the best way to ensure that controls are put into place once the product prototype has been approved.
- 1
0
votes
0
answers
18
views
Impact on high frequency radial forces on ball bearings
Dear Stackexchange forum,
Do high frequency radial forces (e.g. 6kHz) do significantly increase wear and reduce the life span of ball bearings?
I am looking for an expert in ball bearing research ...
- 1
0
votes
0
answers
12
views
A transfer function relating jet engine thrust to pitch angle during a phugoid motion
I am doing a school project that requires me to find a transfer function that relates the thrust of a jet engine (which could change with time in one way or another) and the aircraft's pitch angle ...
- 133
0
votes
1
answer
48
views
What is this kind of drill-bit-like tool called?
I've seen a video with a tool I had never seen before but in the mean time this video has been removed, So I will try to describe instead:
The general machine is a kind of CNC saw. It looks like a ...
- 127
-1
votes
2
answers
35
views
So even though the raw materials of semiconductors are cheap why is their cost so high and why don't we use conductor for the same job?
The materials used in making semiconductor are cheap and readily available then does the cost of processors so high can't we use metals like copper and iron which very good conductor for manufacturing ...
0
votes
1
answer
8
views
Two-Ray Ground-Reflection Model: Understanding the Difference in Phase Offsets at the Receiver
Currently, I'm trying to understand the Two-Ray Ground-Reflection Model.
During my research, I came across the following simplification expressing the received power as follows (taken from Wikipedia):
...
- 3
-1
votes
2
answers
61
views
Will a lid hovering above bursting air bubbles catch smog particles
The bubble bursting phenomenon goes like the above describes:
At 1, the air bubble is under water.
At 2, the bubble emerges above the surface, with a thin film of water rising to keep it from bursting....
- 98
0
votes
3
answers
39
views
How to design safely collapsing buildings?
Background—Currently, buildings seem to be designed to be strong enough to not fall upon dangerous events, such as earthquakes. This makes them expensive, and out of the reach of poor places.
Poor ...
- 117
0
votes
0
answers
27
views
Does anyone manufacture 1/4-28 STI hex cap bolts?
At our shop, we make parts with 1/4-28 STI threads that will later accept a helical insert. The threads are cut on the first side and then used to bolt down to the pallet to run the second side.
We ...
- 21
0
votes
1
answer
31
views
Continuous swinging machine
I'm making art piece that is hanging from roof and I would like to have it in continuous swinging motion. What kind of mechanism could be used in this case?
info about the art piece
about 16kg
shape ...
- 1