Questions tagged [mechanical-engineering]

Questions within the problem domain of mechanical engineering. Mechanical Engineering can be a broad field; consider choosing more specific tags if they apply.

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How does an impact driver hammer and spring mechanism cam backwards when loosening fastenings?

For an electric impact driver / impact wrench, how does the hammer mechanism cam backwards and forwards? In reverse (loosening fastenings), the spring twisting would cause spring extension, not ...
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Static Equilibrium of Rigid Bodies

When we talk about the idea of static equilibrium in engineering mechanics we consider the idealized case of a body which is a rigid body, meaning it cannot deform. Then we solve for the 3 equilibrium ...
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Did anyone ever make training wheels for the original Segway personal transporter device?

I am curious to know if Segway, or any other company, has ever made front and rear training wheels for the original version of the Segway personal transporter device. To help illustrate what I mean by ...
user57467's user avatar
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How to calculate the torque disturbance of an unbalanced flywheel?

I would like to understand how an unbalance of a flywheel affects the dynamics of a simplified mechanical model. Assuming that the mechaincal dynamics can be modeled as (neclecting inertia of the ...
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High temperature in seal oil vacuum pump (not in the bearing), steam power plant. Why the seal oil vacuum pump suddenly increased in temperature?

Seal oil vacuum pump in steam power plant, suddenly have temperature increased, it's in the pump's body, not in the bearing. Why is that happen? I noticed that temperature of main seal oil tank in ...
Ferdiansyah Zhultriza's user avatar
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What does the resonance frequency mean in inertia matching

Like Kollmorgen shows in this PDF how you can calculate the resonance frequency of a motor coupled to a load. But with what can I Compare this frequency? It is clear that a higher resonance frequency ...
fpl's user avatar
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-AN Fitting Compatibility

I have a -6 AN fitting on the end of a hose. I am not familiar with AN fittings and I don't understand how to interpret the table at the bottom of the Wikipedia page on this subject. Does this table ...
user47473's user avatar
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Which aluminum alloy is used in cheap commercial load cells?

I am planning to simulate a load cell in CAD and was wondering which aluminum alloy are cheap commercial load cells made of? I noticed there is no huge difference between the common aluminum alloys in ...
DailyReader's user avatar
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Free body diagram problem: Linkage w/ magnets and friction hinge

I am a bit stumped on a IRL problem, which i simplified in the diagram below: There are left and right beams (gray) linked together by a friction hinge. The bottom beam (black) is connected to the ...
Philip C's user avatar
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How to make Peaucellier–Lipkin linkage work?

I tried in math.stackexchange.com and they send me here. First: Don't crucify me for not "doing math", or asking a dumb question. School was a long time ago, and lose what you don't use. My ...
Bizz Keryear's user avatar
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Elongation before plastic deformation

As far as I understand elongation is the lengthening of a metal in % of it's initial length right before it breaks. But what is in practice more interesting (for some aspects of my bike use case) is ...
aehhhhmm's user avatar
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I have a question about INISTATE Code (Analyzing a curved plate)

I'm studying welding-induced residual stresses for curved steel plates. So, I need to use the INISTATE code taking initial stresses. This is the picture that I want to analyze. I divided a curved ...
moong's user avatar
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How does the thrust rating of a push rod/linear actuator (I've seen it in both kg and N) relate to the amount of weight it can move?

I'm working on a custom RC project, and I'm needing to move a lever with a "weight" of 5 lbs. 5 lbs is required to actuate the lever, and I need to push it 5 mm. Gravity does not affect the ...
M808BScorpion's user avatar
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Could a miniaturised, lightweight Direct Air Capture (DAC) capability for CO2 be incorporated into industrial air conditioning units?

Rather than focus on the daunting task of upscaling demonstration plants on the lines of Climeworks to the extent necessary to remove the gigatonnes of CO2 scientists deem necessary should we not ...
RetroFan's user avatar
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How can I modulate rotation speed of a wind powered device?

I am building a kinetic sculpture. In part of the sculpture I have an axle in a sealed bearing. At the end of the axle are three fan blades that catch the wind and rotate the axle. I can configure the ...
jcapela's user avatar
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Mechanical fasteners for HDPE pipe and sheet?

I need to fasten pieces of HDPE together but I’ve heard gluing HDPE is difficult. I've bought sheets and pipes to make a feeder for a tortoise. I will be using the sheets for covers for the pipes. The ...
Lovingtrout1034's user avatar
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Euler Bernouli Beam theory and its application to vibration of beam

Could anyone please explain what is exactly Euler Bernoulli Beam Theory and why and how its applied in Vibration of Cantilever Beam frequencies and mode shapes . Please use simple differential rather ...
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How accurate is axisymmetric beam theory for modeling plate bending?

I often have to do a quick estimate of circular plate deflection and max stress under simple loading scenarios – uniform distributed pressure, central point load, line load, distributed annular ...
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Silicon carbide in Avogadro Project

I am interested in an issue related to Project Avogadro. Scientists have created a silicon carbide sphere that if it was blown up to the size of Earth, the distance between the tallest mountain and ...
Patrick12341's user avatar
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Book claims one can derive USCS mass unit "slug" from temperature equation shown in screen shots below

In the screenshots below, the author claims that one can derive the mass unit "slug" by somehow using the equation shown in the first picture. I understand how could derive a slug if you ...
NO CURE's user avatar
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1 answer
202 views

What are the benefits of using a spring as a drive screw in this electronic deadbolt?

The Schlage FBE365 electronic deadbolt uses a DC motor attached to a helical screw to raise and lower the C-shaped piece shown. The way the rest of the mechanism works is not important for this ...
Ryan's user avatar
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Identify pairs of points of constant distance between them, placed on two moving (rotating) rectangles

Let there be two squares (or rectangles, but say its squares for simplicity). These squares are attached to an axis (bellow, marked red) around which they can rotate. For simplicity, let's say they ...
Danielius's user avatar
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131 views

How to model a two mass-spring-damper system with a bilinear spring with preload

So, first of all hello👋 I'm new to this forum. Concerning my question, the system I want to model is a somewhat slightly more complicated version of a two mass-spring-damper system (than treated in ...
clueless_engineer's user avatar
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How do I calculate the thrust output of a high bypass turbofan engine? (7th grade)

I am trying to create a small version of a high bypass turbofan engine but I can't seem to find any materials that show how to calculate thrust but on a 7th grade level. If anyone here can help me I ...
random dude tryna learn stuff's user avatar
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2 answers
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I want to find the energy capture from a submerged "waterwheel" type turbine with converging plating of 21 degree to form a ducted funnel

The inlet end would be 1.545 m wide x 1.170. The outlet to the flat turbine blades would be 0.806 m wide x 0.67 m and length would be 1.043.5 m. There are 8 x turbine plates of 0.415 m long x 0.67 ...
Ray Hinks's user avatar
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1 answer
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Locking mechanism by tightening a clamping knob, how to estimate the force required?

I am currently thinking of a way to lock a piece sliding in and out of a slot, as shown in the diagram supplied, using a clamping knob and M6 bolt pushing onto the inner groove of the linear piece and,...
Matthias ADK's user avatar
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Seeking Alternatives for High-Frequency Vibrating Mechani

I am working on a project where I need to create a system capable of vibrating a device rapidly, akin to simulating the flapping motion of birds. The crucial requirement is that the vibration ...
Prabhas Kumar's user avatar
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1 answer
29 views

DLC wear resistance

I read that a thickness of one micrometer of DLC coating (which, if I understood correctly, shows similar properties to diamond), increases the lifespan of an item plated with it from a week to more ...
Patrick12341's user avatar
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Three-way energy harnessing device engineering

I have a question regarding a certain engineering of a such device capable of harnessing energy in such three way. So, what I want to happen is to implement a solar and motion energy harnessing. The ...
William John Otsuro's user avatar
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1 answer
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Formed Suction Intake - What is the purpose of splitting it?

Some FSI's appear to be split down the middle. Others appear to not have this split. What purpose does this component serve? Is this component ever serving the purpose of a structural support?
Adrian Beltran's user avatar
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How would you handle the rebalancing of a bearing cage?

I am a intern who was tasked with finding the correct amount to mill off (in an angle) of a bearing cage (basically an annulus with gaps in it to hold the balls or rollers) to bring it back into ...
Anon's user avatar
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1 answer
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Designing Eccentric Motion

I am working on a school project where I have to choose a mechanical motion device and create a 3D model of it. I have chosen https://507movements.com/mm_090.html because it seems adequate for my ...
Humphrey Appleby's user avatar
1 vote
0 answers
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Resulting pressure of batteries in series

Hi everyone we are working on a battery project and have the following question. What is the influence of stacking battery cells next to each other in a battery module on the resulting pressure ...
Louis DV's user avatar
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1 answer
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How do I calculate the amount of watts that a heating element needs inside a box?

I have an aluminium box (6 mm thick) of about 13.6 m³. Inside the box is a ventilator that can move 140 m³/h and I want to keep the temperature inside this box at about 30 °C. The box is to be placed ...
Magne Nysæther's user avatar
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How to adapt a threaded drive shaft to a keyed shaft (for use with V-belt pulleys)?

I am sure there is a very simple answer to this question, but with no formal mechanical engineering education, I don't know what it is. I have a 2.5 HP, 3,450 RPM continuous duty electric motor with a ...
Colgate2004's user avatar
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1 answer
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Derivation of the fundamental principle in the mechanics of beams

Can someone provide the derivation for the following equation: $$\int_l Q_Z(x) dx = M_y (x) \tag1$$ or equivalently : $$\frac{dM_y}{dx}=Q_Z\tag2.$$ I am interested in the $1D$ isotropic material ...
User198's user avatar
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Load torque required for driving lead screw

I want to calculate motor torque for lead screw mechanism like this (horizontal) I want equation to calculate this mechanism to find motor. I use this equation https://www.youtube.com/watch?v=...
Grittapop Buayam's user avatar
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Is there explicit expersion for the natural frequency of a cantilever timoshenko beam?

I am trying to find a closed form solution for the natural frequency of cantilever Timoshenko beam. In mechanical vibration (Rao, 5th edition) he outlined the details to include the Effects of Rotary ...
AlFagera's user avatar
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3 votes
1 answer
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Lead screw alternative with smooth rod clamped by inclined bearings?

I have seen this lead/ball screw replacement device in a DIY video, possibly related to 3D printing, but lost the link and could not find how it is properly called. It consists of a smooth rod clamped ...
Anton Tykhyy's user avatar
1 vote
0 answers
27 views

Custom Rack and Pinion for 1979 Firebird

I am attempting to convert my firebird to a rack and pinion steering system, so I can introduce later modifications. https://www.unisteer.com/products/1975-81-firebird-trans-am-power-rack-and-pinion-...
Noah 's user avatar
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1 answer
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Nuclear pulsejet

As the title suggests, I am wondering about the feasibility of Nuclear powered pulsejet engines, including Radioisotope Thermoelectric Generators (RTGs). I am not talking about Nuclear pulse rockets, ...
NERDO's user avatar
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What type of low-power fan or blower should I use to ensure continuous flow of mist/water vapor into a water bath for studying heat exchange?

I plan to perform a lab experiment where a mist generator produces warm mist at a rate of approximately 5-10 liters per hour. This mist will be directed through a pipe to which I wish to attach a ...
Afeefa Rahman's user avatar
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What are my options for intermittent motion gear system?

I have two gears (main is 48 teeth, driven is 20 teeth, module 0.3). The main gear is rotating in 1/3 of a turn increments, but I need to drive the second gear with only 12 teeth out of 16 of that 1/3-...
atzkey's user avatar
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1 vote
1 answer
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Seeking Manufacturing Advice: Low-Dose Powder Dosing Device

Hi everyone, I'm working on a project that requires a device to dispense a very small amount of powder (around 1 gram per second) in short bursts. Ideally, the device would "sneeze" the ...
100T's user avatar
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0 answers
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Transfering rotation to translation in most precise way?

i am trying to make a very precise machine which will use a very precise linear encoder (nm range) and very precise servo motor. I want to use servo motor rotation to precisely move a "thing"...
LukaJ's user avatar
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1 vote
1 answer
85 views

Distance sensors with accuracy of 0.1 mm?

I am looking for a sensor with 0.1 mm accuracy and a sensing distance of 1-10 cm for an industrial machine. The machine is used to ensure product quality following the assembly process. It will be ...
Emre's user avatar
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1 vote
0 answers
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Validation vs verification in mechanical engineering

I'm confused about what the difference between Validation and verification is in a mechanical engineering context please? Also, where in the engineering life cycle/design process are these steps? What ...
WarwixkD's user avatar
2 votes
2 answers
73 views

How to work out the kWh required to compress hydrogen gas?

I am trying to work out the kWh/kg of compression of hydrogen. I have used the isentropic compression calculations and get values for the entropy but am unsure how to get this to a kWh value. I might ...
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Is front shroud more thick than the lower shroud used in impellers ? Thickness of shrouds of shrouded impellers used in turbo pumps of rocket engines

This is an impeller used in turbopumps for increasing the pressure of propellants to drive the rocket engines. I wanted to ask all the engineers currently working in manufacturing of these impellers ...
Lakshay's user avatar
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0 answers
20 views

New Method for a Passive Magnetic Bearing

Is it possible to create a passive magnetic bearing by layering the outside of a shaft with a magnetic film and placing a magnetic ring on the outside. The outer layer of the film would have a north ...
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