All Questions
15,097
questions
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High torque timing belt
I'm building an automatic litter box for my kitty and I tried building two versions using a GT2 timing belt + pulley but the belt seems to slip from the pulley often (since it requires high torque) ...
- 101
2
votes
1
answer
16
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Different installation requirements for normal bolts vs torque-to-yield bolts
Why do stretch bolts need to be rotated 90 or 180 degrees after being torqued to a specified value? Why not just torque it to 120 nM instead of 100 nM + 90 degrees of rotation?
Also would it be ...
- 21
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7
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Advice needed on How to cool 50ml liquid from 60 C to 30 C
In Short: I'm working on a project where we need to cool 50 ml of liquid from 60 °C to 30 °C or 20 °C. The liquid will be in a 150 ml copper container with an open top.
Due to the lack of skills in ...
- 1
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votes
1
answer
15
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Different connecting rod designs for diesel vs gasoline engines?
I've noticed that diesel engines tend to have rod caps that are installed at an angle as supposed to straight on gasoline engines.
This is an example of a generic diesel engine piston and this is an ...
- 21
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3
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how to create a Ti V simulation cell with virtual cell approximation for density functional theory calculations
I would like to understand the method of creating simulation cells using the virtual cell approximation for different compositions of TiV using vasp
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1
answer
19
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Is there a torque wrench you can use a "Cheater Bar" on?
Do there exist torque wrenches whose accuracy would not be affected by the use of a "cheater bar"? https://www.teamtorque.com/frequently-asked-questions#:~:text=Q%3A%20Can%20I%20Use%20A,...
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6
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Effect of pair of complex zeros on system response
Talking about system transfer functions, a lot of resources are available to estimate the effect of one real zero on the system response.
However, I did not find anywhere a good resource that states ...
- 151
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22
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how to find final temperature of a fluid in an heat exchanger?
I have to find final temperature of water in an heat exchanger.
the heat exchanger must cool down air using water, meaning initial temperature of water must be cold,
initial temperature of air is 298....
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14
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specifications for a vacuum box 20cm x 15cm x 8cm
what material and thickness would I need to make such a box and what pressure pump would be practical?
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answers
7
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Unexpected UART communication behavior on Basys 2 FPGA using USB-to-UART converter
I am facing an issue with UART communication on a Basys 2 FPGA board (design in Verilog). My board doesn't have a built-in UART, so I'm utilizing a USB-to-UART converter for the purpose.
In my ...
- 1
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1
answer
25
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In a thin-walled cylinder, what exactly is Hoop Stress vs Radial Stress?
If I have a thin-walled and not very stiff cylinder, such as a rubber-band, and I put it between two pins and pull it apart radially, is the force required considered the hoop force or radial force? ...
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1
answer
27
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Would the reduction ratio of a pulley drive also be applied to a compound pulley?
So, a pulley drive with the drive pulley having 1cm of diameter and the driven pulley 10cm of diameter would have something around a 10:1 reduction ratio.
However, I don't know if the same logic ...
- 27
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answers
23
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Problem about Savart Liquid Sheets (MIT 2013 Final Exam) [closed]
Here's a problem from MIT's 2013 final exam in Advanced Fluid Mechanics.
Can someone please post the answers to the questions?
Thanks.
- 1
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answers
11
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Fly wheel design in MSC ADAMS
I am trying to model a crank rocker mechanism with flywheel. The flywheel is attached on the crank arm join so the crank and flywheel will be rotating with same speed. My aim is to reduce the the ...
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43
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Max. setting for air condition for a vacant apartment located in a desert
I own a condo (that's American for an apartment) in Tucson, Arizona. It is rented out most of the year. However, Tucson is located in the desert, so in the heat of the summer months (June-August) the ...
- 111
1
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1
answer
30
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How will the motion of air be just before the isolation damper?
Let's say I have duct work shown as below. I have air moving from left to right with high velocity.There are two elbows and there is a damper of the same kind just before each of them and there is ...
- 11
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35
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Distributed load on a slope/axle
In statics they teach you about distributed beams, how to calculate the total force, the engagement point, etc. I can't find any information anywhere on distributed loads on unevenly sloped surfaces / ...
- 1
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18
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Cost effective hand held medical scanner
I am currently doing a summer project where I am tasked with taking precise measurement of skin deformations, whether it be wounds or pimples, the measurement of the z-axis depth is what I am ...
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votes
2
answers
56
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Can tyres placed on track derail trains?
This question is based on the following news article. I just want to know if rubber tyres are strong enough to cause rail derailment if placed on the track
- 103
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6
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What is collapse multiplier in OptumG2 software? How to reduce the error percentage for calculating active Earth pressure?
I am working on an analysis of a retaining wall. After doing a limit analysis on the structure, the collapse multiplier that I am getting for both upper and lower limit is very high. As it is not ...
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12
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Why datum in the pipe in the Bernaulli equation is choosen at the centre of the pipe?
Why is the datum taken at the center of the pipe in the Bernaulli's equation? I want to know this to understand if the hole 1 will drain the tank faster or the hole 2. I understand that the time ...
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answers
17
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How do you go about picking a belt in design?
So when you want to pick a beam to use or determining the thickness of a load bearing beam, or picking bearings, there is some calculations you do to see if its life expectancy or f.s or to see if the ...
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answers
7
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APFSDS - Attachment of sabot to the penetrator rod
Short question, does anyone who know how ammunition manufacturers attach a sabot to the penetrator rod?
- 1
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answers
17
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Why carrom coins have the circular profiles on them?
Why do carrom coins have these circular profiles on them? At first I thought that this will reduce the friction as area reduces, but quickly recalled that friction for solids don't really depend that ...
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answers
14
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Need help in understanding torque and Spring Force
I have another question for the smart people on here!! I am working on a project and I need a better understanding of the forces.
I have a torque applied from a torque driver of 0.7 Nm to screw down a ...
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answers
7
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Make Assembly Load Options unique to each assembly in Siemens NX 12
I have a few assemblies I'm working on. For the most part, each assembly is self-contained in its own folder (assembly file and part files). However, there are a number of common parts that are stored ...
- 1
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0
answers
11
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Question about dynamics n-t coordinate system
et = tangential unit vector
en = unit vector in normal direction
I'm currently studying dynamics and I'm having difficulty understanding the process of obtaining det and det/dt in the n-t coordinate ...
- 1
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28
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Improving a poorly designed project. Seed dispersal using a BLDC Turbine
I would like to get ideas on how a project of this sort can be improved.
The Project
A simple sphere of diameter 130mm that is split horizontally by a wall. The wall does not equally divide the sphere,...
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answers
27
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A master's degree in control systems vs electronics engineering [closed]
I'm trying to decide between two master's programs that I have received admits from. I have a bachelor's in Electronics and Communications from India. I am interested in working on mixed-signal design ...
-1
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0
answers
13
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Is it possible to keep radius of rotation the same/constant while angular velocity of a rotating object stuck to the rope increases?
Under no gravitational effect, there is a rope fixed in the center of a table, and an object rotates with the end side of the rope. Let's say their current radius of rotation is "R".
If ...
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16
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What is the optimum layout for a hydrogen compressor, that would have least wear and tear on the compressor?
I have been investing time in understanding the layout/schematic of a compressor that would be used for compressing hydrogen to high pressure ratings.
It's not clear to me what is the best design - ...
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19
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Tanker exhaust sequence blows sulfuric acid everywhere and I need to rig up something to slow the exhaust without impeding flow rate
I am not an engineer myself and I'm hoping you guys can help me with a project I am working on.
So we receive rail car tankers full of sulfuric acid that we pressurize like a beer keg to offload the ...
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votes
1
answer
20
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How to relate stiffness, weight, moment of inertia to obtain a stiffer system?
The technical field of the question is gantries in CoreXY 3D printers, where a gantry moves in Y direction and it holds a carriage sliding in X direction. In the following image, X is horizontal and Y ...
- 169
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13
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Mechanical Drawing Ventilation Abbreviations - Canada
I'm trying to figure out what the abbreviations are for exhaust fans in mechanical drawings. I've posted an example below, which is shown in the legend as Supply Air (SA), along with its size and ...
- 1
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1
answer
27
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Moving internal forces for the sake of stress
I am studying mechanics of materials and I'm confused with determining internal forces for the sake of stresses.
Consider this diagram: (just for visualization. from Beer Johnston book)
when ...
1
vote
2
answers
28
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Does a venturi flow measurement work when the tube does not widen again?
In the classic explanation of a venturi tube there is a wide part, a narrow part (throat) and then another wide part.
Can an accurate measurement also be obtained if there is only a wide and narrow ...
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21
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Effective Designs for outdoor clothing elevator free from walls
A strange question, but I live in a building (gringo in Mexico City) where the only area you can dry clothes is in a set of chain-link cubes on the roof. However, those cubes are about a story and a ...
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2
answers
32
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What is the easiest way to cut ~1000 steel rods - each one 1.5mm in diameter and 12" long - into ~6000 rods that are each 1.75" long?
Any ideas for tools and/or jigs that would be best to use for this?
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21
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slits and slots
We are designing a part such that it is clamped. We are providing a slit for tube insertion. I need to know how much depth and width we can provide the slit sizing. Here I am attaching the slit image.
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1
answer
22
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What is the actual detection range of AMG8833 thermal imager sensor?
I am using AMG8833 thermal imager sensor for my project. I have read in datasheet that its field of view is 60 degrees and it can detect source till distance of 7 meters.
But I want to know what is ...
1
vote
1
answer
25
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Residual Stress Induced By Shot Peening
I'm interested in the residual stress profile induced by shot peening. Most of the papers I have read do some measurement and include a graphic which looks like:
This graphic identifies how the ...
- 15
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1
answer
33
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What would be the efficiency of dielectric elastomers if these were made with copper wire instead?
My apologies if this isn't the right Stack to ask about dielectric elastomers, but I couldn't find any other search result on other stacks about dielectric elastomers, except here.
So, no matter how ...
- 27
1
vote
2
answers
28
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What motors would be suitable for linear actuation in 1-2mm footprint?
I need to control simple braille (text for blind people) array with tiny rods. I don't necessarily have to control the precise location. A linear actuator with on/off states would be enough. However, ...
- 11
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6
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Opposing orientation of multi-stage particulate filter in Nitrogen separation/purification system
I recently purchased an assortment of parts taken out of a Nano Purifications Nitrogen Generator, one of the parts included was a two stage filter for removing particulates from the air stream. The ...
- 1
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votes
2
answers
38
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Sensor to measure distance with high precision
I am making a machine which, from the curve of the top of a violin, cuts the feet of a bridge.
I thought that a sensor attached to a motorized rail could take precise measurements of the distance from ...
- 103
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25
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What unique graphic software needs do you have? [closed]
As engineers/architects/mechanics, what specific graphic software do you need to work with? Are there cases in which you do not have enough existing funds? At conferences such as SIGGRAPH, a lot of ...
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10
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Phase diagram for 1,3 butadiene + acetonitrile binary mixture
Acetonitrile (82 deg C b.p) is used to absorb 1,3 butadiene (-4.4 deg C b.p) in several manufacturing processes. I am looking for a binary phase diagram at 1 atm. The only thing I could find was ...
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0
answers
24
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Is a vibrating Euler beam supposed to behave in this way?
I am a student of mathematics and for my modelling seminar, I need to dip a little bit into engineering in order to model the movements of a suspension bridge under influence of wind. This will be ...
- 1
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0
answers
11
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Does 'Jet Impingement Cooling' always cool?
I understand that by using jet impingement cooling, we can achieve a high convective heat transfer rate, but there is also a stagnation region where the kinetic energy of the jet will be converted to ...
- 327
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29
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What is hydraulic engineering actually used for? [closed]
What exactly is hydraulic engineering actually used for? Why as a civil engineer we study this? What is the real life implementation of this topic?
Do you have any suggestions for this topic?
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