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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11 views

Is the use of direct-expansion indoor units to heat or cool exit enclosures permitted under the US model building Codes?

Most multistory buildings have enclosed exit stairways somewhere within them to provide safe egress from their non-discharge floors. In a building that relies on hydronic heating/cooling, steam ...
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1answer
25 views

Boundary layer thickness decreases as fluid velocity increases, so why is the boundary layer thicker in the turbulent region for higher velocities?

I am modelling transitional fluid flow over a flat plate, and investigating the effects of free stream velocity on boundary layer thickness. From what we have been told, increasing free stream ...
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1answer
27 views

Determining max shear stress

So I understand that shear stress can be either in the the form of transverse or torsional or both at the same time. And normal stress is due to the moment or a force normal to the surface. My ...
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23 views

Calculating properties from S-S curve

Alright, for this data is it correct to get young modulus as 16GPa please and resilience as 14j/mm^3?? For resilience is it just 1/2(stress)(strain at yield)? Stress is first column in MPa Cheers lads ...
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1answer
51 views

Are M8 screws double the size of M4 screws?

Found some printable M8 screws on Thingiverse (https://www.thingiverse.com/thing:4805480), which made me wonder if I can get M4 screws, just by resizing them factor 0.5.
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Boundary Conditions of a Stepped Beam

I would like to ask about the boundary conditions to be considered in a stepped beam. For a cantilever beam wherein the one end is fixed while the other end is free to oscillate along the z-axis, we ...
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1answer
26 views

Sleeve and cotter joint

What does 0.1D signify in this cotter joint. I meant is it denotes spacing between pin and hole. I am new to machine drawing , kindly let me know. Thanks in advance
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16 views

Relation between links and pairs in Kinematic chain

I came across a equation for kinematic chain (for lower pairs only) : L = 2P-4 where L: Number of Links; P is the number of pairs how could this equation be derived ?
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3answers
56 views

Calculating Load On Winch From a Distributed Load?

I am in the process of building an antenna mast that can tilt from horizontal (down) to vertical (up). The mast (arm) is 360" and weighs a total of 105 lbs. I need to calculate the amount of ...
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21 views

How to find a reference line for “ Form Tolerances”?

In my project I have to choose a form tolerances ( parallelism ) between the handle ( purple part ) and the part that sits inside it ( the grey part ), where the two parts slide on each other. But I ...
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2answers
67 views

Inconsistencies with units for thermodynamic identities

I am working out the temperature for an Ideal diesel cycle: Based on the isentropic properties for an ideal gas. $$T_f = T_i * r^{k-1}$$ Where $T_i = 50 ºF = 510ºR$ If I use ºF, then $T_f = 172.9ºF = ...
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52 views

Mechanical Engineering: Pulley Physics and Equivalent In Axial Rotational Gear Machinery

I have looked at pulley physics at this link and this link and this link. Conceptually, is there an equivalent method in physics to do something similarly in axial gear machinery so that the force ...
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2answers
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What can I coat on Stainless sheet (316 L) plate to achieve high thermal reflectivity?

I was thinking of using some Aluminum coating/blanket but the temperatures can reach 550C+ in the Chamber I work at. I am concerned about melting. Let me know. P.S: I am an entry level Engineer. ...
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12 views

How to calculate minimum and maximum cross-section of a compression clip

I am trying to design and 3D a custom snap in fastener, and I am having a hard time figuring out what cross section it needs to have so that it does not break when compressed, but also isn't so that ...
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2answers
53 views

Minimum drum wall thickness when rope wrapped around it

I need to design a hollow drum that holds steel wire rope under tension. The wire rope gets pulled from both ends with a force of 200kN, it is wrapped around the drum 5 times. The outer diameter needs ...
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3answers
72 views

How to calculate beam impact problem

Can anyone help with this Impact problem? It does not seem very difficult but I am having trouble putting all the parts together. Thanks,
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1answer
37 views

force required to bend .375 thick aluminum tab

We are trying to determine the force that was needed to bend an aluminum tab on a piece of our aircraft equipment. The tab is deflected 2 inches and is 3 inches in length. load was at the tip (3 in ...
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1answer
327 views

Mechanical Advantage of 3 Pulley System

I am a physics teacher, but have found myself teaching engineering. I have come across the following pulley question, and am starting to doubt my own understanding of pulleys ! Until now the rule ...
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1answer
44 views

horizontal rail to vertical conveyor

I am trying to find a solution at an industrial line problem. I have a product which is cylinder, ~40 grams, 6cm length x 2cm diameter. The products (cylinders) are coming from a machine (output) in a ...
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2answers
47 views

How to attach a metal rod to an air cylinder?

I have signed up for an engineering class, and the first project is purely mechanical. I've never done mechanical work, so this is quite interesting to me. I have come up with the following project - ...
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27 views

What does a higher eject force do in a clutch?

I am looking at two clutches and the details on both are identical. The only difference is the eject force. One is 3300 and one is 3600. Does a higher eject force mean higher performance? And also ...
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1answer
18 views

How is the sliding velocity between two spiral gears derived?

How is the component of the velocity along the tooth equal to Vsinα for both the meshing gears? Making the relative sliding velocity Vs = V1sinα + V1sinα
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1answer
25 views

Rubik cube torque experiment - Correct equations and experiment set up?

Background I am attempting to experimentally find out the average torque required to rotate a single face of a Rubik cube. Little to no data is available as it varies from cube to cube. Some people ...
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1answer
14 views

Making a three phase squirrel cage induction motor in PLECS?

I was just curious if I was to make a Three phase squirrel cage induction motor connected to a mechanical load System Block Diagram in PLECS with a rated frequency of 60hz, 6 poles, 220V rated stator ...
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17 views

How to solve stress/strain constitutive equation for system of springs and dampers with a Coulomb friction element added in?

I am attempting to solve the stress/strain constitutive equation for a system of springs, dampers, and a Coulomb friction element. Basic examples for such constitutive equations can be found in this ...
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Three switches executing the same program for SCN5 Actuator

As indicated in How to reconfigure a control box unit for an SCN5 actuator question I want have 4 actuation programs as described below home, 100mm travel, home home, 75mm travel, home home, 50mm ...
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2answers
42 views

Mounting a digital indicator on a plate

I have a flat aluminium plate and I need to mount a digital indicator[1] on it. The digital indicator doesn't seem to have any mounting holes itself so I think I need to use a clamp to hold it. I don'...
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15 views

Help to position a sliding point on GIM

I'm building a mechanical system using GIM for university purpose. I have to position the sliding point in (X=0.320, Y=0.320*tan(25°)). This point have to be accurate to study the cinematics (PICTURE ...
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1answer
106 views

Why is the Stress vs strain diagram preferable to the Load vs displacement diagram?

I’m really unsure what is the difference between stress vs. strain and load vs displacement graphs and why stress-strain is better. I know that the units are different: stress is in MPa and the load ...
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3answers
72 views

What is this mechanical pump called?

I am unable to find it again but I once heard of a type of air pump that involved a pair of offset archimedes screws inside a cylinder. The point of the device was that as the screws would turn ...
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39 views

Is there an analogy between mechanical vibrations and electromagnetic waves

Recent questions about analogies between mechanical and electrical systems and about electromagnetic waves from a conductor made me wonder whether there is an analogy between the mechanical vibrations ...
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23 views

Why is carbon boil even necessary?

Particularly in an Electric Arc Furnace I have seen carbon boil occuring . I understand the reaction is very vital but what is it's utility? A detailed answer to this is most welcome. The internet ...
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1answer
32 views

Peltier Module Set up isn't cooling

I have set up a peltier module with an aluminium heat sink, cooling fan, 12v, 7ah battery supply and thermal paste for the purpose of cooling water. At first, it performed well. It dropped down to 3.5°...
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1answer
47 views

What is the name of this piece in the image attached?

What is the shiny metal piece around the tube in the picture called?
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2answers
63 views

Criteria for gear design

Updated with comments/answers from community to make more complete I'm trying to understand why gears are designed in some specific way instead of another. So far my understanding is that: energy is ...
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0answers
23 views

PAC2002 Tyre Model: Rolling resistance moment is 0

To calculate rolling resistance moment in PAC2002, formula which is given below can be used: In my tire data (.tir file), QSY1 and QSY2 are 0. According to these values, this moment is calculated as ...
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0answers
24 views

Building a bitcoin “flip-clock” ticker [closed]

I want to build a bitcoin "flip-clock" price ticker. I want to build a physical number flipper, with numbers from 0-9. I was thinking about LED matrix, or e-ink display, but that's not as ...
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1answer
35 views

What does time temperature specifically give us? [closed]

What is a Time Temperature curve basically? I have come across this a couple of times while dealing with heat treatment in my industry. A detailed reply to this is most welcome.
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1answer
28 views

Why is manganese steel non magnetic in as cast condition? [closed]

Is it because of some ferrite stabilizer or something?A detailed explanation to this is most welcome.
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2answers
57 views

How can I ensure steady flow to all the valves?

I've set this up for my hydroponics water distribution system. The water is pumped up, and is distributed via the valves. I can manual control the valves so that each outlet has a steady flow of ...
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2answers
64 views

Professional threaded insert in plastic?

I'm getting some plastic parts (made with HDPE) CNC machined. A few of these parts require the addition of threaded inserts. I've printed the parts myself using a 3d printer and when I add the ...
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2answers
67 views

Pressure vessel wall dimensions

I am trying to design a small cooling setup which has two parts: the compressed air vessel and the turbines. My understanding is that the compressed air, upon being released, passes through the ...
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27 views

Can we run ANSYS Fluent/OpenFOAM simulations in AWS or any free server?

I was planning to run some FSI related simulations. But the computation capacity that I have is not sufficient. But I had heard that there is a possibility to create instances in the Amazon EC2 or the ...
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20 views

Motor Torque Required in a Reciprocating Compressor

I am working on a Univerity project involving a reciprocating compressor and I am having trouble verifying the motor's torque requirements. I am relatively happy with my calculation method, however, ...
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1answer
35 views

Economical difference with high-pressure vessel design pressures for fixed volume

Suppose space is not an issue and I need a fixed volume of compressed air (for storage), say 1m³. Is it more economical to manufacture a thick-walled vessel but with a smaller volume or a thin-walled ...
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17 views

Sprocket Angular Velocity [duplicate]

I have a question please that I need help on. Consider the chain that is draped over the sprocket with mass moment of inertia of 0.005kgm^2 about central axis. If 4kg block is released from rest from ...
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1answer
33 views

Why does decrease in dislocation density result in higher ductility?

Why does a decrease in dislocation density result in decrease in yield strength and increase in ductility?A slightly detailed explanation is what I am looking forward to.
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29 views

How much is the braking torque of this belt brake?

I just thought of a mechanism that has a belt brake, but I cannot calculate the braking torque. On the picture, the middle black shaft is stationary, and the blue is rotating with ω1 speed. The green ...
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1answer
60 views

Deflection Equation of a Stepped Beam

Help out a college student. How do you derive the deflection equation y(x) of the shown stepped cantilever beam in the figure? Each segment has a unique Young's modulus and moment of inertia. The ...
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1answer
75 views

What is meant by soaking time in heat treatment?

After heating at 950°C and holding the temperature for 3 hours there is a soaking time that is provided for 12 hours. What is the soaking time being referred to here? A detailed reply to this will be ...

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