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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12 views

Low-Flow Nozzles for Corrosion Spray Testing

So, for a cyclic corrosion test system, I need a nozzle or arrangement of nozzles that provides a flow rate of 45ml-140ml of salt solution per hour to an area 60cm square. All commercial nozzles I've ...
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1answer
17 views

What mechanism is available to rotate a metal piece on another metal piece?

I am trying to find some type of mechanism where I can have a smooth but not too stiff rotation between two metal pieces. I was thinking of putting a shoulder screw through the pieces (the pieces will ...
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Fitting a sprocket on a small motor shaft

I have a bit of a newbie question. I've inherited a mechanical system, wherein the motor has a D-type output shaft with a diameter of 8mm. (https://www.ebay.co.uk/itm/DC-High-Torque-Worm-Reducer-...
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1answer
23 views

Valve that opens at low pressure closes high pressure

My fluid handling system requires a valve that will open at low pressures (2-6 PSI) and close at high pressures (8 PSI). Is there any commercially available valve that is suitable for this application?...
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18 views

Rolling U shape profile

My plan is bending sheet metal as curved u profile using rolling machine something like motorcycle and or trucks fenders. Is it possible ?and how?
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26 views

Why am I getting multiple answers for different points on the same line?

Different torques about the given axis are obtained when the torque for force F is taken from point A and point B on the same axis. Why does this happen when torque about the axis should be same for ...
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1answer
60 views

How to form steel truck fenders [on hold]

I want to set up steel truck fenders production line, but have no idea how to do that. Something like this picture. Edit1: I have two plans to form final curved shape , using a hydraulic press or ...
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13 views

Finding Tension in cable in 3D Equilibrium

In a typical 3D Equilibrium problem. Assume you have two cables points supporting a mass. The two cables are K distance above origin and form a quadratic triangle with the mass which is a the same ...
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2answers
32 views

I'm looking for a way to keep a wire coiled when it's not being pulled on, and retract when it isn't

I'm working on an application where a panel rests on a flat plane, and is hinged along one edge with a bit less than 90 degrees of travel. I need to run a wire from the flat plane to the edge of the ...
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1answer
41 views

Center of rotation (rigid body)

I know the meaning of (instantaneous) “center of rotation” and “center of zero acceleration” for a rigid body. I know that they do not coincide (in general) and that their positions change with the ...
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2answers
52 views

Pin joint system displacement question

A pinned system comprising bars of the same material and cross-sectional area is subjected to a vertical load P. I am required to form a relationship between FAB and P. The first part of the ...
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2answers
22 views

How to reduce tilting in self-made gimbal

I made a gimbal at home with PVC. Used some cement filled PVC pieces as hanging weight to make the phone steady. But when I shoot with it, I feel some tilting movements in the video due to the ...
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1answer
20 views

Mechanism of a manual Crank Adjustable Height Standing Desk

I am trying to figure out the lifting mechanism of a manual Crank Adjustable Height Standing Desk. Please see the image below: My question is what it is inside the metal frame (check the red marked ...
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Why a factor of 2 appears in gasket force calculation in ASME section VIII div. 1 flange design?

In mandatory appendix 2 of ASME section VIII div. 1 the following calculation is given for calculating minimum bolt load required for operating conditions of a flange joint i.e. , under internal ...
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2answers
34 views

A few questions about cars

When I start the car, why do I hear the engine working when I'm not pressing the gas pedal? How exactly does the torque and power of the gears work? Torque = Radius * Force Power = Torque * Speed ...
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2answers
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Is there any reason why “inner-flange” style trains are almost universal?

There's basically two ways train wheels can operate, the flanges could be either "inner" or "outer". Switches can be made in equivalent ways for inner and outer flanges. We could expect that, just ...
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1answer
27 views

bending rigidity of a metal rod

Say you have a metal rod with a square cross section (say 10cm by 10cm) of a certain length. You'd like to make it less prone to bending. Is it better to: keep it the way it is or remove material ...
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2answers
37 views

Thread size for a rod

I am wondering is it possible to have a M16 thread on a 15mm rod? How is this manufactured? Any links to more info or answer would be very helpful.
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1answer
21 views

What is the difference between a bogie and a chassis

Both bogie and chassis seem to define the part of a wheeled vehicle that describes how the wheels are linked together. Are these ...
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23 views

How to determine if my stepper motor will rotate this shaft

I have a stepper motor with the following characteristics: - Holding Torque: 40 N* cm - rotor inertia: 54 g*cm2 - drive torque 2.2 N * cm This is the system: the shaft is HDPE, and the ...
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2answers
18 views

Press brake tooling for 360 tube?

I’m trying to find out if it’s possibly to form a cylinder or tube with a diameter of 1 inch using some kind of curling die for a press brake. I’ve seen dies that make small 360 degree bends like that ...
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2answers
32 views

When does torque applied on a shaft produce bending and when does it not?

In both cases in the picture above torque is applied to the shaft, however in the first case the force $F_{c}$ also produces bending across the shaft. So my question is, how do I know if a torque ...
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10 views

Naming of 1P4A or 5A layer configurations

Glass is brittle and easily damaged. So, a new kind of glass material is made, in which it's layers are made of hexagonal tablets (made of borosilicate glass) arranged in 1P4A or 5A, as happens in ...
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14 views

Rotating vertical pole setup

software person here, venturing for the first time in the design of a mechanical system for a hobby project. Please note I have some experience in disassembling, fixing, reassembling mechanical ...
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1answer
27 views

How are the location of Gausian points determined in Finite element theory?

From the finite element theory, what is remained a bit unclear for me, is that how do we know the location of gausian points where the integration is done for each specific type of element ? it is not ...
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2answers
76 views

What is the difference between hydraulic and ABS brakes?

Recently I read an article about ABS brakes. In that, they repeated several times the term that traditional hydraulic brake replaced with ABS brakes. Why it so? The reason for choosing ABS is ...
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1answer
18 views

O-Ring Design for low pressure applications

I'm trying to figure out how to create a seal for a very low pressure gravity feed system. Essentially its a low pressure solenoid valve. Is there any equations to estimate the amount of force you ...
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1answer
32 views

Flange nut design

What is the difference between bearing circle diameter and flange diameter in context of prevailing torque flange nut? I see that maximum value for flange diameter and minimum value for bearing circle ...
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1answer
33 views

What is the Source of the 10% Trailer Tongue Weight Recommendaton?

Throughout the trailer, hitch, and tow vehicle industry a recommendation of 10% tongue weight for a tow-behind trailer and 15% for a 5th wheel trailer seem universal. They have even been changed to 10%...
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1answer
37 views

Calculating needed motor to spin a disk at low RPM

I'm designing a machine that I need to spin a horizontal disk at low RPM using a motor and gearbox. I'm not good at physics so I need help to find a motor/gearbox to fulfill my needs. It's a ...
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14 views

How can I develop the displacement imposed frequency response function?

in theoretical vibration books , almost all of them to my knowledge, the FRF function is always developed for a system of SDOF or MDOF being excited with a unit force. but in FEM softwares there is ...
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26 views

Heat sink Design

I have a problem where there is an 80 Watt thermal load that needs to be cooled to maintain 80 Celsius. The base of the heat sink is 5" x 7" and is oriented vertically with cooling via natural ...
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1answer
22 views

Typical IMU accelerations and angular velocities for lower limbs

Is there a dataset out there right now that shows the typical acceleration and angular velocity values for sensors attached to the thigh, shank, and feet for standard walking? Or literature/textbook ...
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20 views

Gasket material and thickness selection

Problem statement- The bed plate is profiled as shown in figure (i.e. ups and downs are there at bolt and non-bolt position). The range of unevenness is about 50 to 100 microns. Due to which gap ...
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16 views

How to determine whether a validation study produces acceptable results?

I have a method developed to predict results of a signal that outputs an root mean squared error (RMSE) for each subject. Combining all 40 subjects, I get a mean RMSE of 5.5 with a standard deviation ...
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24 views

Is Model order reduction good for complex models with a lot of contact points in them?

we know that MOR ( or model order reduction ) is used to reduce the size of heavy FEM models. but if there are so many faces, edges of the part that are in contact with another part in the model or ...
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30 views

What are the advantages of parallel pushrod configuration?

A topic that came up in a recent discussion was pushrod engines (specifically V2 configuration in a motorcycle) with four cams. After some googling, I was able to find an example in the Harley-...
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2answers
44 views

Is it ok for clutch to slip in DCT in certain situations?

When driving a car with manual transmission on start you slowly release the clutch so the car doesn't jerk. So clutch slippage here is not that bad if I understand this correctly? And also couldn't ...
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9 views

Minor losses in a header

I need to calculate the minor losses in a steam header. I have calculated the major friction losses. But I can't figure out how to find the minor losses since the header has multiple tappings and not ...
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4answers
668 views

When calculating a force, why do I get different result when I try to calculate via torque vs via sum of forces at an axis?

If I just do it by writing that the sum on y axis is 0 I get $100+x=200$ $x=100$ If I try torque around the top: $x*800=200*500$ $x=125$ So what am I doing wrong?
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2answers
84 views

From a mechanical point of view(Physics/Engineering) why are Front-Load washers said to clean/wash better than Top-Load washers on average?

Which cleans better? Is it just marketing or do they really clean/wash better due to some physical property or the way they work, I am asking how do they if they do? N.B I do not intend to indicate ...
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14 views

Comparing power requirements of centrifugal pump installations

Hi, I am stuck with a question related to the centrifugal pumps. There are two centrifugal pump installations and it is asked to compare the power requirements for two installations. As in Pa>Pb or ...
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18 views

Is it possible to reduce energy consumption of air separation unit by using single column rectification process?

Is it possible to reduce energy (Joule or KW) consumption of air separation unit by using single column rectification process instead of double column rectification? Is there any examples that this ...
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1answer
28 views

Inertial Forces while analysing forces on a Piston in a Slider - Crank Mechanism?

I get that we are analysing the Piston in a non-inertial frame of reference, but the point of my question is that according to D'Alembert's Principle, whenever an inertial force comes in the line of ...
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36 views

Most efficient turbine for harnessing energy from bidirectional air flow?

I am currently working on designing an oscillating water column as part of a project. In summary: OWC are devices with a semi-submerged chamber or hollow open to the sea below, keeping a trapped ...
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1answer
18 views

pmma vs glass windows? [closed]

I was told that PMMA is preferred over glass for windows in cold climates because of it's R-value being higher than glass.I wish there were a stick-on film made of glass! That could be used to cover ...
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2answers
62 views

How to calculate required torque

Currently I'm doing a personal project, but I've some doubts about the calculation process. Well, I've a platform (2.30m length x 0.32m width). This platform is supported by 4 wheels with a diameter ...
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What engineering concepts are used in EV3 programming/ a Mindstorms robot? [closed]

If possible, could someone please compile a list of the engineering concepts associated with EV3 programming and Mindstorms robots. Thank you - your answers are much appreciated.
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22 views

What is the smallest size of pipe to which I can Weld a 1 inch pipe Perpendicular to the Axis?

I would to know what is (or how to calculate) the size (dia) if the smallest pipe to which I can weld a 1 inch pipe from the side of the bigger pipe perpendicular to its axis (like a tee).
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1answer
27 views

Car's shock absorbers' damping ratio

I'm trying to find a suitable shock absorber for a small ATV with a specific value (to be determined later). But everywhere I look, no one seems to be giving the damping ratio of the shock absorbers. ...