Newest Questions
17,286 questions
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How are Standards decided
Maybe this is a dumb question but i've been curious how are testing standards determined and is there any way to access them for free as an aspiring engineer. Like how are Experimental instruments ...
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How to model a polypropylene Infrared Weld Seam for tensile testing
I am trying to use Ansys workbench to model a weld from an infrared welder so that I can conduct a tensile FEA test on it. I have the SolidWorks files of the seam, but I am unsure how to actually ...
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Slack Flow conditions
A commercial steel pipeline with a 10 in. ID carries water over a 300 ft high hill. The actual length
of the pipe is 500 ft. from the pump station to the top of the hill and 500 ft. on the downhill ...
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How can a planetary gear error give this weird rotation periodicity?
Having trouble with two 1kg plastic planet gears which can lift an anvil (steel reinforced).
They are nearly the same, just one is defective, it has a very weird rotation, it stops and starts like a ...
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Is there any force/torque sensor that can determine the net force producing the strain, irrespective of the point of application?
I would like to measure the weight of something that hangs off a cantilever beam. My idea would be to put some sort of force sensor in the beam's anchor point, but a simple strain gague won't do, I ...
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Request for guidance on designing a kinetic facade mechanism
I am a digital architecture student and for a university project I need to design a mechanism detail that shows how kinetic facade panels move. To prepare this detail, I need guidance from people who ...
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FreeCAD how to constrain angle of endpoints of an arc
Learning FreeCAD, I stumble on this pretty basic problem: how to constrain an arc? Of course, when drawing the arc, it is easy to set the radius and angle, but that leaves the problem of how to set ...
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What crimp tool setting should I use for these bootlace ferrules?
I have this crimping tool and these ferrules for 22AWG stranded wires and these ferrules for 18AWG stranded wires.
On the crimping tool with datasheet here I can see these numbers for each crimping ...
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How to analyse relationship between a distributed load and bending moment through integration
I was recently working through an internal function question and was using the relationships between Loads, concentrated forces, shear force and bending moment to sketch the diagrams and find some ...
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OpenSCAD. A way to assign materials
I want to try out structure design. What i've done by far is a SCAD model for four trays and a cover above them. This question is a duplicate from SO. I will delete if inappropriate here. I have IT ...
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Optimal transition geometry between larger and smaller ducting
I was designing a filter which uses a much smaller fan than filter size. I am curious if there is a optimal way to transition between the smaller fan duct and the larger filter duct. Below I have have ...
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Connection Between Bolt Tightening Torque and Bolt Coupling Torque Capacity
Can someone please explain to me the connection between the torque calculated for tightening a bolt, and the torque capacity of a a circular bolt coupling consisting of n bolts?
The torque required to ...
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Retaining Ring & Keyseat Placement - Shaft Design
Reference - Machine Elements in Machine Design, Sixth Edition, Pearson, Robert L. Mott, Edward M. Vavrek,Jywhen Wang PAGE 526
AND =======
Reference - Machine Elements in Machine Design, Sixth Edition,...
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axial load acting below a beam
This curiosity came to me when I was interview prepping. I was doing a basic question that at some point required to calculate the bending moment at some cross section in a diagram that looked like ...
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Correct way to apply fillet edge to a pocket corner in a FreeCad topology
I have created a straightforward cubeoid with a pocket extending through one edge and exiting through another. Please see the attached images.
As you can see, the rounded edges with the pocket hole ...
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In wastewater treatment screw press dewatering system [closed]
In screw press dewatering system the how the filter rotate when flushing time
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Saltwater Tank Design Specifications
I’m looking for some guidance on designing a large seawater tank. My initial concept was a rectangular plastic (PP or PE) tank, roughly 6×4×4 m with a water height of around 3 m.
However, I’ve been ...
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How I can solve the question if (cos 30)^2 + (cos 45)^2 greater than 1
The stresses in a rectangular block of a material are : $\sigma_x = 80 \text{ MPa}$ ,
$\sigma_y = -80 \text{ MPa}$, $\sigma_z = 60 \text{ MPa}$, $\tau_{xy} = 50 \text{ MPa}$, $\tau_{yz} = 40 \text{ ...
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Is tungsten really the element with the highest melting point?
Tungsten has one of 3422°C but carbon has one of 3500°C so isn't carbons higher? Even though carbon technically does sublime, but it will melt under high pressures.
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Petroleum Engineering Drilling Engineering_El Nino
I’m an undergraduate student in Petroleum Engineering, and I have a question I’d like to ask.
One of my professors recently assigned a topic for our next session, asking us to research something ...
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70
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Is there a standard flow diffuser design?
I have a 1" PVC pipe that outputs a tremendous amount of water (exact rate is hard for me to determine, but the pump it's connected to has a theoretical maximum output of ~1600 GPH) that I need ...
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Optimal speed for cone milling mechanism (example: manual coffee grinder)
I have a manual coffee grinder with a cone milling mechanism:
When I increase the rotation speed of the crank, the time needed to grind a certain quantity of coffee decreases (as one would expect), ...
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Retrieving internal forces of a 3-noded Timoshenko beam element (Finite Element Method)
I'll first give the problem description and after that I'll introduce slowly my problem (sorry for the long text, but needed for the question). I use Maple 2024 for my derivations and calculations.
...
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Asking questions for a project where I need to interview an engineer
I'm a college freshmen whos needs an engineer to help me by answering these questions:
What is your major and where did you get it from?
Where do you work and what does a typical work day look like?
...
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Are industry 4.0 certs (SACA) widely recognized?
I work for a major auto manufacturer, and I have been lucky enough to apply and become accepted into an apprenticeship program. To develop a production associate into a maintenance technician. I am ...
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How to approximate and determine the internal forces at a point using parabolas
One problem of statical mechanics: An archer aiming at a target is pulling the bowstring with a force of 45 lb. Assuming the shape of the bow can be approximated by a parabola, determine the internal ...
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372
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Gluing carbon fiber to aluminum
I want to take some CF tubing like this, glue in some aluminum inserts, and use them for bolt-together model airplane wing center sections.
Specifically, I'm looking at the 8mm OD, 6mm ID pultruded ...
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Hi, can anyone suggest a material/process to lap the alusil cylinders in bmw? The idea is to remove aluminium from around the silicon crystals
A product called an30 from an American company called sunnen is the preferred option but its not available in the UK
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Load factors, wind and solar - future optimisation
Can anyone weigh in on this - or suggest where I might find good evidence, or where else I might ask a similar question?
I'm reading a fairly reputable source (in Nature - Stern et al 2024) that ...
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Swing lens camera optics
I'm making my own rotating lens panoramic cameras and the latest has a 50mm lens with a 3mm slit 12.5mm from the film plane and the image has a lot smear to it where as the last camera I made has a ...
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How to adjust linkage dimensions in SolidWorks so two links rotate exactly 90° simultaneously?
I am reposting this again because in previous post I couldn't add new image.
Almost all dimensions are relevant. Here are the lengths linkages and distances between points.
AB= 200 MM,
AC=195 MM (This ...
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Low torque/force motor designs that don't contain any magnets or non-magnetized ferromagnetic materials (no "iron"), and compatible with high vacuum?
Motivation for the question: I need to make a small translation stage for a few gram sample that works in a vacuum. The motors (linear or rotary) must not produce even weak magnetic fields, at least ...
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How can I define a key performance indicator to determine if a heat exchanger is fouled or not?
I’m analyzing historical performance data for a plate heat exchanger (counterflow) where one side uses lake water as the cooling medium, the warmer side is water. From maintenance records, I know the ...
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Cantilever racking column arms capacity calculation need help please
Hello, I have a cantilever racking that already exist with all the document lost about rating or capacity. I already calculated that each arm can handle 1500 lbs and that the buckling of the column ...
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What are the critical engineering considerations for designing the Polymer Electrolyte Membrane (PEM)? Optimal proton conductivity?
The polymer electrolyte membrane is the heart of a PEM fuel cell, dictating much of its performance and lifespan. Key engineering considerations revolve around maximizing proton conductivity while ...
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Why is the acceleration factor proportional to square of absolute water vapor pressure in semiconductor devices?
I am looking for the physical or chemical reason(s) to explain why the acceleration factor in acceleration tests of semiconductor devices under high humidity environments is approximately proportional ...
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How to match ANSYS stress calculations with force and moment reaction values
Given a simple cantilever beam with an axial and transverse load, I look at both the axial force and the bending moments on a surface through the middle of the beam. The issue is, when I calculate the ...
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Help with car physics
I am making a car inside of a game engine and I want to understand the formulas for calculating the cars angular velocity, torque etc and what really happens when the throttle is increased.
In my case,...
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How can I improve my drawbridge door mechanism?
I’m building a 3/4" plywood box with a drawbridge-style door, driven by an 8" linear actuator mounted to the side. The door-side attachment used threaded inserts and machine screws.
Those ...
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1
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Wood-frame box ribs and spines bracing -- inside or outside?
This structure will be built from a medium-hard density wood. It's a camper box, so will be mobile and needs to stay rigid when loading / unloading from a truck bed. The rib struts are 3x3", 2.4m ...
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Advantage of Reduction Order in Gear Train
Let's suppose I'm designing a two step gear train. I want a total reduction of 15:1 and I've decided that the two easiest reductions to make are 5:1 and 3:1. Does it matter which order I put these ...
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Rules for choosing the correct area when calculating shear flow
To calculate the shear flow in the middle of the meat in the upper left corner of the beam (.5 right and .5 down from the outer corner), the author uses the area shown. But why is this correct? What ...
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Moment of a pulley on a shaft, doesn't use right hand rule
I am wondering why in this problem, when taking a moment about the x-axis, the 65N force creates a negative moment and the 80N force creates a positive moment when this is opposite of the right-hand ...
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Pressure differential created from change in volume
I am trying to figure out how would I be able to determine the pressure differential that will be sustained if I removed a certain amount of volume of air with a fan? This is a rather extreme and ...
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How to make straight horizontal runoff surface in mold design? Autodesk Inventor 2025
I have slightly bended detail, and I tried to make a mold for it.
In Mold Design we have a step called "Create Runoff Surface" aka Parting Line > place where Core and Cavity meets.
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593
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Why do the rims of the 8020 extrusion point inwards?
The drawing of the cross section from the 8020 web site.
The drawing does not say by how much. But the rims that hold the T nut are not exactly horizontal and vertical. Why?
I checked some beams ...
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Optimizing an airfoil for a range of velocities
This is a bit off the cuff. I was watching a video of a performance analyst for cyclists. I'm not that into cycling, but I've been riding more recently and this piqued my interest. One of the things ...
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Is this design of a simple linear beam and rail trolley system realistic?
I'm designing a rail span 50 meters long with a 100kg cart rolling along its length. Rail needs to be ~1 m above ground. The biggest load the rail will take is 100kg (cart+payload), and we'd like to ...
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86
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Determining zero force members in trusses
I encountered my problem when trying to determine the diagonal member second from the right in the bottom image. The only conclusion I can come to is that it's a zero force member because if it wasn't ...
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2
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Structural integrity of indoor metal mezzanine
I work at a company which recently purchased a new building. They basically converted what was a large industrial warehouse style building into a half manufacturing floor, half office space. The ...
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