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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2answers
39 views

Measuring a pattern size on a flat surface

I want to manually measure the dimension of a pattern printed on a flat surface, with an accuracy of about 0.1mm. For simplicity sake, let's say this is a black rectangle, printed on a white ...
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1answer
59 views

Calculate deflection of a beam with an arbitrary shape

I have a beam with rectangular cross section, but rather an strange shape in the length wise direction as seen below: So I have taken out the symmetry part of it: And it actually has some nice ...
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1answer
18 views

Why rotation factor of bearing for inner ring is 1 and for outer ring is 1.2?

V is a rotation factor to account for the difference in ball rotations for outer ring rotation vs. inner ring rotation. V = 1 for inner ring rotation V = 1.2 for outer ring rotation From Shigley's ...
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1answer
20 views

Are there succesful solid fueled internal combustion engines?

Are there any succesful solid fueled internal combustion engines? Particularily, ones that produce shaft power (not rockets and not ramjets)
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1answer
42 views

Stability of 3D-printed mask after sterilisation

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6797553/ https://www.hatchbox3d.com/collections/pla We are 3D printing masks that need to be used by medical staff treating COVID19 patients. The first ...
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1answer
23 views

Solidworks motionstudy/motion study causes parts to “jump”

(solidworks files here) I've made a small assembly thet mooves smoothly manually, but when I try to moove it the same way is motion study, it collides is a strange way... what can be the cause of ...
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0answers
18 views

How to measure / calculate Tait-Bryan angles of a moving platform in SimMechanics

I exported a model of the mechanism created in SolidWorks to SimMechanics in order to explore the possibilities of control. To solve the problem, i need to know the angular position of the mobile ...
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5 views

What's the best type of steam Trap for Superheated Steam?

Process Engineering Newbie here. What kind of Steam Traps are best suited for condensate removal in super-heated steam line or manifold? The super-heated steam is to be supplied to a process reactor ...
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2answers
18 views

Relation between engine size and its power to weight ratio

Is there a relation between engine size and its power to weight ratio? For example if you shrink the engine to half the size will it have exactly half the power?
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2answers
24 views

What's a simple machine to lift and drop a 100 lbs weight repeatedly using an electric motor?

Essentially I have a 100 lbs. pile driver with an eyelet for lifting it on top. (It's on rails) I want to set up and automated machine to lift and drop the driver at a variable pace. Preferably I ...
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1answer
16 views

Linear guide ball bearings

I'm planning to drive a small linear guide (4cm long) with a servo in a setup like this: I wonder if the ball bearings inside would sustain too much stress due to the vertical forces exerted by the ...
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0answers
10 views

How can I learn the standards(EN,ANSI,ISO) which is related to “roller hemming method in automotive industry”?

There is a method using in automotive industry which is called roller hemming. I have a project about this method but before beginning the project I need to learn the standards(EN,ANSI or ISO) which ...
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1answer
21 views

What gives gas turbine/turbojet engines such high energy density?

What is the cause of turbojets'/gas turbines' high power to weight ratio compared to piston engines? They certainly use a generally less efficient thermodynamic cycle.
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11 views

What is the formula for the effective strain in a Holzapfel type material

I came across a term called average effective strain. I do not know what it means and I was wondering how I could calculate it for a Holzapfel-Gasser-Ogden model? Thank you very much in advance
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37 views

Why isn't an all wheel electric steering system used?

If we had electric motors at each wheel and micro-controller sending them power, through an electronic speed controller, one could easily make left and right turns simply my decreasing, or increasing ...
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2answers
51 views

basic physics: does pulling on a hook place greater stress on it than passively hanging from it?

Sorry for such a basic question, but it is a safety concern that brings me here: We have a hook installed on the ceiling. From it a rope chair (examples) hangs. Assuming good form and no wild ...
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0answers
23 views

Clamping Force required

I am currently working on a design for a beer pump (liquid dispenser) of (15 kg approx.), that will be clamped to a table with 2 clamps. This component has a handle attached to the top, where ...
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2answers
34 views

Gear train using two inputs and one output. Understanding six link epicyclic gear topology - Interpreting displacement graphs

I'm interested in printing a working two degree of freedom planetary gear set. I searched around and found a paper from University of Maryland in 1988 (source). I am having difficulty translating the ...
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1answer
44 views

Unit Conversion for Mass Density

I am doing a Finite Element analysis of a continuum. In my problem definition I use these units: mm for length, kPa for applied stress, and MPa for material stifness (Young's modulus). With these ...
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3answers
24 views

Increasing Force Output on a Spring Return Pneumatic Cylinder

The downside of using single-acting return spring pneumatic cylinders is the decreasing output force through a full stroke due to the opposing spring force. I'm wondering how would you design a spring ...
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0answers
28 views

If a water jet strikes a surface,does it mean its flow will be parallel to the surface?

I was solving fluid dynamics questions from F.M White and came across the following problem, I am unable to understand the phrase "deflects back as a conical sheet".Is it suppose to mean that the jet ...
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1answer
27 views

Required torque of climbing tracked vehicle

Currently I'm designing a tracked vehicle for a school project. It has to carry a weight and be able to overcome some obstacles which are about 3/4th the height of the tank. What I'm stuck at, is ...
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2answers
35 views

What would you call a sliding door that slides up and down and how would you make it's mechanincs?

I am working on a package collection system and I was wondering how I could do the mechanics of a door that slides up and down. I have thought of using pulleys with string or linear actuators, but all ...
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0answers
23 views

W ill a 1000 W 48 V electric go cart motor power my scenario?

I am working on a one wheel project. I would like to use a electric go kart motor, chain driven to a 30 cm diameter wheel and get 90 kg resting on the axle; at least 13 m/s with an acceleration of 3 m/...
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2answers
49 views

Derivation of the stiffness of a uniformly loaded cantilever beam

The stiffness of a uniformly loaded cantilever beam is given as follows: I am trying to derive the stiffness, but I am facing a problem. I would be glad, if someone could help me out. What I have ...
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3answers
63 views

When an elevator has two buttons next to it, ^ and v, what do they actually mean?

Both as a kid and as an adult, I've encountered elevators lined up next to each other, or single ones, which have two buttons on each floor (outside of the elevator): ...
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0answers
12 views

Ansys Autodyne basic question… Need to learn it on my own!

This is regarding the ansys autodyne. I am trying to analyse the interaction of a metallic fragment (5x5x5mm) with a mild steel plate (300x300x1.5mm) to know the perforation velocity. For atest ...
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0answers
24 views

Using a system of equations to graph the temperature change of a boiler

An exercise lists several equations and constants for a boiler system. These are to be used to plot a graph showing the change of temperature over time until the boiling point is reached. The ...
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1answer
37 views

how to determine how much speed a motor will produce under load?

I am working on a one-wheel project, I would like to use an electric go kart motor chain driven to a 30 cm diameter wheel and get 90 kg at least 13 m/s with an acceleration of 3 m/s2, I ...
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1answer
36 views

Maximum velocity of an athlete [closed]

I was solving a mechanics sum An athlete running a 100m run starts from rest and reaches the maximum speed in a distance of 15 m. He runs the remaining distance with that velocity and reaches the ...
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0answers
69 views

How many kWh this turbine would generate?

My grandfather and I are running some experiments down the river, however we don't have expertise in engineering so I bring up this question to the community and hope someone could help. How many kWh ...
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1answer
30 views

How to measure the power output of a stirling engine

I'm doing a project for thermodynamics where I have to measure the power (work over time) of a Stirling engine for varying temperature differences. I don't necessarily need an exact answer (as in: ... ...
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1answer
25 views

Shear flow for unequal leg channel

How does the sine part i.e. $\dfrac{\ell\sin(\theta)}{2}$ appear in the calculation of shear flow ($q$)? I mean, if I'm not mistaken, the sine part is the distance from the x-axis to point D, but how ...
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4answers
143 views

How can a clutch engage gradually without wearing away very quickly?

Here's an animation of a gearbox and clutch from Wikipedia. I learned to drive recently, and was surprised at how the clutch worked, engaging gradually as I moved the pedal by fractions of a ...
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2answers
47 views

Linear actuator behind lifting boom

This is a follow-up on my previous question here: Sizing a motor for a floor jack-like mechanism The floor jack setup is clearly inefficient when it comes to electric actuators. Something similar to ...
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1answer
54 views

Sizing a motor for a floor jack-like mechanism

I've been trying, as a thought exercise, to run some calculations on a floor jack-like mechanism that is expected to lift 130kg (287 lbs). Dimensions and setup are as per the image below. The 130kg ...
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1answer
20 views

How to calculate the required torque for an azimuth/elevation antenna rotator?

I want to build an antenna rotator for a 1M dish. How do I calculate the required torque for the motor of the elevation axis? Here's a sketch of the problem: If the "bottom" of the dish is the pivot ...
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1answer
24 views

How much should I put effort to refine a Response surface?

A response surface that I have obtained from a DOE analysis with multiple variables, show small irregularities when I plot 2D variable-vs-variable curves . like somewhere it should be exponentially ...
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0answers
16 views

Is it possible to change geometrics in order to acheive kinematic/dynamic similarity? Scaling an aircraft design

I am trying to scale a general aviation aircraft design. The objective is to increase "useful weight" by 375-400 pounds. Dynamic similitude is the primary goal. Background: I am absolutely in love ...
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2answers
50 views

Changing (alternating non linear) screw motion

I'm looking to put gradual pressure on a syringe, using a screw (pushing the syringe top). I want one rotation of the screw at the start to put a certain pressure on the syringe and then gradually ...
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0answers
16 views

Adding shock absorber to the bumper beam? [duplicate]

I'm an engineering student and i want to do project on this and i need some opinions. We already got bumper beams for low impact I'm talking about medium impact.
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0answers
17 views

How are the elastic properties for orthotropic materials ordered?

How are the elastic properties for orthotropic materials ordered? More specifically, orthotropic materials have three axes of symmetry, so what is the conventional ordering of the axes? In more ...
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2answers
32 views

Dimensioning of beam pressed by screw in assembly

I need help dimensioning a screw-beam system of a press. I built one prototype but the beam is bending too much. Below is a sketch of my press. In the middle it has a fixing screw which presses ...
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0answers
10 views

RSS Tolerance calculation and usage

From my experience, I've been calculating RSS tolerances by squaring all relevant tolerances, summing them up and then square rooting the sums... ie: RSS=[Σ(tol^2)]^0.5 I've also heard of other ...
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2answers
82 views

What are these outdoors “mystery boxes” for in the USA?

While watching random videos shot in the USA (in the present time), I've noticed these little weird outdoors boxes: What is the purpose of these? They look like they might be related to ventilation ...
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4answers
804 views

What is the maximum angle of a shelf angled brace?

So suppose I want to make a single shelf protruding from a wall and to place a heavy object on it (Figure 1). A shelf like this would fail (assuming no internal mounting that penetrates into the wall)....
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2answers
37 views

Chemical engineering equivalancy to the spring-mass-damper/RLC circuit

I understand the equivalency between the MSD and RLC circuits. Mass ~ resistance, spring ~ inductor, damper ~ capacitor. With the equations of the form MSD: $$ m\ddot{x} + c\dot{x}+ kx = F $$ ...
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Calculating predicted failure load from tensile modulus, moment of inertia, and dimensions of sample in 3-point bending test

I'm trying to find a way to be able to predict the failure load given that I know the breadth, depth, testing length, moment of inertia tensile modulus from a load vs displacement plot (and calculated ...
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2answers
54 views

Driving a lead screw using a universal joint

I have some issues regarding a lead screw. It's used as the main driving system for a scissor lift which requires about 2Nm torque to operate. This is the exact part if it matters: https://www....
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1answer
36 views

Calculate MPH on the tire based on RPM of the hub?

I’m building a pitching machine that has an 8” wheel (16” OD tire) that is directly mounted to a 1/2” motor shaft. Most similar questions reference a gearbox or pulpy system, but my situation is ...

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