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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7 views

What CAD program is easiest for designing Ninja Warrior courses?

It would be nice if there was an easy to use CAD program with prebuilt parts such as trusses and ropes and mats, vertical wall... things that go in a ninja warrior course. Just so I can drag and drop, ...
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1answer
25 views

Can a threaded fastener stretch so much it can be miss-read as a different pitch?

Can a threaded stud of mild steel, size 5/8"-11 over a threaded portion of 1.25" stretch so much over time that it reads 5/8"-13? Unthreaded portion of the stud reads .625-630" in ...
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31 views

What mechanism do safety belts use to engage?

Earlier today I came across a creep testing machine that uses a safety belt as a mechanism for stopping loads from hitting the ground. It is probably the first time I saw a safety belt roll outside of ...
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1answer
30 views

Can we make a motor without a permanent magnet and with wireless energy transfer?

If we could transfer energy wirelessly with 100% at short range. Then what if we create a motor that have both stator and rotor be an electromagnet? By putting a magnetic coupling to transmit energy ...
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1answer
31 views

Single linear actuator lifting mechanism

I have inherited a DIY build and I have some doubts about its design. Have a look at the following diagram: 1 is the linear actuator. It's quite beefy 2000 lbs 12" stroke. It is installed in an ...
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33 views

Why is the sling advantageous in a trebuchet? [closed]

It seems to me that mounting a projectile in a cup at the end of a solid arm would be at least more accurate and if movies are any guide, some trebuchets (if it is still called that if it lacks a ...
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1answer
35 views

Is there a loss in light transmission when using acrylic lens, instead of glass, for collimating a led light beam?

I've got a led headlight for illuminating a small spot region at 30cms distance from my head. I've let it fall and the glass lens chipped. So I unscrewed the lens and got a piece of acrylic rod which ...
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25 views

Where can I find the best mechatronics forum? [closed]

Where can I find the best mechatronics forum in the Stack Exchange or are there any other better forums out there besides Reddit?
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23 views

detachable press magazine lock case

detachable press magazine lock case Any idea of what is the proper name of this locking mechanism ?? I been searching for it and can't see to find the same one I'm looking for( note this has nothing ...
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23 views

Can you get the ratchet mechanism out of a socket wrench by itself? Anyone know where if so?

Title pretty much says it all; looking for a reversible ratchet hub for a special latch that I'm designing. Definitely open to any ideas/sources that the community at large might have. Thanks!
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1answer
35 views

Braking movement of a chain through a pulley or sheave

I am attempting to build a rotating climbing ladder, similar to the one below. The structural supports will be different, but the mechanism of chain (or cable) running in a loop over pulleys/sheaves ...
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1answer
27 views

Best solution to fix loose bolts problem, on delicate/ fragile surface?

Most common practice to fix loose bolts is using washers, but while using washers and tightening the delicate surface gets damaged, so what are better alternatives to fix loose bolts problem
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22 views

Simplifying the soda gun mechanism

I'm looking to design a push button mechanism similar to the soda gun where water is forced to pass through a single passage based on which button has been pressed. What are the different approaches I ...
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1answer
24 views

How to interpret the phase plot from an accelerometer on vibrating machinery

Attached is a plot of amplitude vs frequency and on the inset phase vs frequency. I have constructed this phase plot via $\arctan\left(\frac{Im}{Re}\right)$ How can I interpret the phase plot or ...
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2answers
65 views

How high will a flywheel catapult launch a payload?

First off, this is not a homework question or anything like that. I'm trying to build a catapult to launch a payload using a flywheel as an energy device! It goes like this: The flywheel spins up to ...
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16 views

What is the pressure of water-dew resulted from cooling of atmospheric air down to dew point temperature?

Suppose, In a room, Air is at 1 atm presssure. So should be the pressure of any water surface in the room. If the room temperature is cooled downed to dew point temperature, vapor (moisture) will ...
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3answers
66 views

Buckling of Parallel rods

I am trying to calculate critical force $P$, if two rods (same diameter and length - rigid fiberglass sandwiched on two steel plates) are parallel to each other. $$ P = \frac{\pi^2 EI}{(KL)^2} $$ I ...
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2answers
53 views

Can you use an accelerometer to measure beam deflection under static loading?

With an appropriately collocated accelerometer is it possible to retrieve lateral deflection of a beam under static loading. The beam will be loaded and then deflect until it reaches equilibrium with ...
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1answer
41 views

Bending of an L-shaped beam

First post so bear with me: I am designing a frame for a press, which needs to be able to withstand 250 N. I am planning to make the frame an L-shaped beam, turned around. With a side view, it will ...
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1answer
50 views

transformation matrix from the original reference to the main reference

Consider the state of tension in the neighborhood of the point $ P $ represented in the Figure. Determine the principal directions of the stress state in $P$ and write the transformation matrix from ...
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2answers
58 views

why do centrifugal compressors have curved blades?

Why are centrifugal air compressors built with backward curving blades?
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1answer
19 views

Specifications of Tensile Test Specimen?

I am Currently Working on Measuring Various Mechanical Properties of Metalic Materials using Universal Testing Machine (UTM) at Various Temperatures. I know that for Testing at Ambient Conditions, ...
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1answer
31 views

Work calculation in a thermodynamics cycle process

To calculate work in a cyclic process (say Carnot cycle) we find area under p-v curve,or use net heat transfer= net work done. Why won't we simply add work calculated in each process of a cycle,like ...
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2answers
37 views

The behavior of the stress-strain curve of metal, containing a void

Let's assume that in a metal sample without any dislocation, there is a void. Then we conduct a uniaxial tensile test. (1) How does the stress-strain curve change, when the size of the void increases? ...
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1answer
34 views

Determine the range of τxz values for which the maximum tangential stress is less than or equal to 60 MPa

Consider the state of tension indicated in the Figure. Determine the range of τxz values for which the maximum tangential stress is less than or equal to 60 MPa. I did σ(med)=(60+0)/2 = 30 To find ...
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0answers
20 views

multidimensional function for object description

I want to simulate a bow tie antenna and build it up with a function. so far i have managed to create a piece of cake with sin and cos. Now I would like to expand the function and round off the ...
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1answer
32 views

Pipe with change of section

I'm a novice in mechanical engineering and I'm having some troubles to find a pipe that change from one section to other. In this case I want to connect a circle section to a rectangular section. I ...
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0answers
22 views

High articulation joints

Looking for advice or suggestions for high articulation joints (>57°) for an automotive halfshaft. Peak operating conditions are in the ballpark of ~1000RPM, ~300ft-lb torque. I've considered u-...
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2answers
45 views

Failure in Hollow, Thin Beam due to Collapse of Cross Section

I'm having trouble figuring out how to predict the failure of a hollow channel due to bending. If I'm correct, for a beam with a static second moment of area, $I$, the following equation could be used ...
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3answers
47 views

Keeping resonant oscillation of a pushchair to soothe a baby

I just came back from a walk with my 4-month-old. He's sleeping in his pushchair. I am sitting next to the push-chair and slightly pulling the pushchair's side so it gently rocks from side to side in ...
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1answer
119 views

What is the maximum force needed to move the roller block from point A to point B and where does that maximum force occur?

Hello everyone. This project is for a very specific application and I am trying to determine the force necessary to get the block from point A to B. Specifically the maximum force necessary and at ...
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2answers
42 views

How do I connect multiple water-filled syringes?

I'm trying to connect 4 separate syringes containing water and we need water-tight tubing to prevent water from leaking out of the system. The water would theoretically need to be pushed out of one ...
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49 views

What type to mechanical joint to achive Slide then Rotation motion

I have two parts (Green and red fixed) i want to connect them with a joint (Blue) that permit the green one to slide outwards then rotate. Side View (Right part) a simple pivot point doesn't work ...
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1answer
28 views

Is molecular dynamics relevant for an undergraduate Mechanical Engineering degree? [closed]

I am completing my final year undergraduate study in Mechanical Engineering. I've had to have a scope change because my last project was not going to work with the pandemic. I've been given a project ...
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31 views

Marine engine firing orders

For a while, I was curious as to what the firing orders for inline 7 and inline 9 engines were. I was able to find them in datasheets like this one, which is a project planning guide for the MAN 35/44 ...
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2answers
55 views

Python for mechanical engineers [closed]

I'm a mechanical engineering undergraduate student and I want to start learning python. There are lots of online courses (free and paid) on the web but I don't know which is the most useful for a ...
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3answers
61 views

Aluminum square tubing capacity question

I have an awning that I am attaching to the corner of the house. I needed to extend it so I got a piece of 6063 square aluminum tubing. It's 1 inch wide with .125 wall thickness. It has about 2 feet ...
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1answer
39 views

Head loss for T junction diverging water pipes

I am writing to ask for help with a T-junction pipe problem. Attached picture shows the pipe configuration. The schematic shows a large pipe with ID 16.5mm and smaller 4mm ID tubes connected to it. ...
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1answer
29 views

Fix plastic tub (leak) and resist applied forces

I hope I'm not too much off topic here. I'm hoping it can make sense as a mechanical engineering question. There is a crack in the front of the tub of my front loading washing machine. As you can see ...
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3answers
210 views

Practices used for making a material light weight and giving it more strength

What are common practices used in making a material light weight and giving it more strength. By practice I mean: Making holes in the material to reduce weight Reduce thickness to the bare minimum ...
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1answer
53 views

Stress vector that acts on the plane

A flat plate with dimensions 110x220 mm is subject to the indicated stresses. Assume that $\sigma_{zz} = 120\ MPa$. Determine the stress vector that acts on the plane defined by the z axis and the ...
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2answers
55 views

How can propeller blades be made silent?

In particular drone propeller blades. I read that the noise we hear is the propeller compressing the air at the edge of it to produce a sonic boom. Is that true and is there a way to negate that?
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1answer
33 views

CNC side linear rails

I've been wondering why most (hobby) CNC machines have two actuated linear rails like this: Besides the extra force for moving the spindle, is there a need for both rails to be actuated? Could the ...
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0answers
40 views

How do I derive the expression for A plus solenoid and C plus solenoid?

The photo shows the setup.The actual question is " Using the groupings as shown and following our usual notations, which of the Boolean expressions is correct?" I tried working out the ...
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2answers
62 views

How do I calculate how many newtons a hollow rod can carry without buckling?

how can I calculate how many newtons a 600[mm] long rod with a known yield strength (300 [MPa]), young modulus (190 [GPa]) and hollow (outer diameter = 16[mm], inner diameter = 10[mm]) will carry ...
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2answers
35 views

What is the name of this thing? (hex key reduction?)

What is the name of this thing? I am trying to find it by keywords like "hex hey reduction" etc. but so far no results. My problem is that the plastic socket is easily damaged and I want to ...
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0answers
27 views

Calculate required torque for cam design

Would like to check the following design (snail cam) require how much motor rated torque? To ease calculation, i have include some assumed factor as below. Two extreme condition (rotation degree) to ...
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1answer
37 views

Safety types and definition [closed]

I am searching for some Engineering terms but couldn't find any of the definition. Direct safety Indirect safety Warnings Thank you in advance
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1answer
52 views

What makes a pulley that is rated for horizontal pulling different from a pulley rated for lifting?

I have a home project that involves lifting a platform with a cable that runs through a series of pulleys to redirect the cable. I'm selecting pulleys for the job and I see that some pulleys are rated ...
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1answer
414 views

What's the best way to design a joint with two fasteners?

When you're trying to design a relatively long joint with only two fasteners, what's the best way to arrange them? Since fasteners effectively radiate a circle of clamping force around them, what's ...

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