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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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Efficiency of TurboJet engines with nozzles

As per Bryton Cycles most of TurboJet engines Thermodynamic efficiency should be around 40%. Rest of energy gets rejected as waste heat in exit gases of turbine. But if these hot gases from the ...
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20 views

Machine Frame Design

I have a query about the design of machine frames. For example, if I have a steel frame that is supporting the load of the mechanism above it. First, I analyse and find all the internal axial and ...
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1answer
12 views

Spring Industry Naming Convention

I am currently prototyping a part for a personal project. My CAD design was contracted out and there are some off the shelf parts that I need to order per the design (springs, screws, etc.). My ...
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I dont know how to calculate my electrical power needed to get .5 Watts (heat = 𝑄)

Interior surface temp=46C, exterior surface temp = 28C, i'm using polystyrene with a k = .025. it is a cubic oven with an opening on the ceiling; the resistance is located on the floor area (bottom)
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At what Force does the Rod break? [on hold]

There is a rod of diameter D and Length L. During Testing the rod is subjected to tensile load at constant frequency (say 210 Hz).But The force on the rod keeps on increasing during testing. How ...
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33 views

Hydraulic Engineering - Surface water / flow

A trapezoidal channel with a bottom width of 6m, side batter slopes (H:V) of 1:3 is on a longitudinal slope of 0.001, with Mannings n= 0.015. for a uniform depth of 1.5m, calculate the cross-...
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Solenoid stroke limits

Im new to rotary solenoids and I had like to understand the definition of stroke. For example, some rotary solenoid has in its technical information a parameter called stroke options and it says 25-...
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2answers
15 views

Design of Gating & Runner system in Gravity Die Casting

How to design gating and runner system in permanent dies so that material flows smoothly throughout the design without spilling back from the gating channel. What should be the shape of gating system ...
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1answer
21 views

Adhesion of Super Glue (containing ethyl cyanoacrylate) and PVDF (polyvinylidene fluoride) film

Would it be considered safe to use super glue, which contains ethyl cyanoacrylate, to attach a PVDF film to a metal alloy? It says super glue is not recommended for polyethylene or polypropylene. ...
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1answer
20 views

Locations of max stresses in a circular beam?

If a torque and axial force is applied to a beam with a circular cross section, where along the cross section of the circular beam is the location of the max shear stress, max bending moment, max ...
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3answers
42 views

Moments of Fixed-Fixed Beam

I have a quick question related to the topic of mechanics of materials. If I were to have a beam that is fixed at both ends and has a central point force, do moments develop at the fixed supports? e....
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1answer
13 views

Bonding PVC Cables To Metal Housing

I have thin, variable diameter PVC wires that run along a metal housing. Problem being, they can get pulled on and disconnect. I want to bond them down to the metal housing as a sort of strain relief ...
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1answer
25 views

How do I call a kinematic assembly that converts rotary motion to sawtooth linear?

I have in mind a device somewhere in between a firearms trigger and a clock escapement. One way it could be constructed is as follows: A crank would displace a linearly moving slider backwards, so ...
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1answer
41 views

understanding required torque for a servo

Good morning. I have been reading the threads about "Understanding required torque for a motor lifting a weight" in hopes it would apply to my situation. I would like to utilize an R/C servo to rotate ...
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1answer
45 views

what is the degree of freedom of a pair of gear wheels?

Two gear wheels A and B are touching each other and they can rotate about fixed points P and Q respectively. how to calculate the degree of freedom of the system by using gubbler's equation?
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Why do instructions on creation of roller chain sprocket tooth profile require redundant measurements?

I'm CADing a tooth profile for a bicycle chainring model and I'm referring my measurements and formulas to these sources: http://www.gearseds.com/files/design_draw_sprocket_5.pdf https://data.epo.org/...
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40 views

Are these force components right?

Would you also decompose the centrifugal force this way? $m_{tot}$ is the total mass of the Hyperloop. $a_c $ is the centripetal acceleration. $\beta_a$ is the angle formed by the air bearings with ...
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2answers
24 views

Does utilizing exhaust energy to supercharge (“turbocharging”) increase the thermal efficiency of a gasoline internal combustion engine?

The work done by a turbocharger increases the inlet charge without much of a burden to the exhaust flow. This increases the amount of air (and fuel) that flows into the engine. How does this affect ...
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Rotary to Recipricating Permutation Gear Ratios

I have two of these in parralel: They need to be connected via the inputs in such a way that the two gray sliding parts (A, B) cycle through every possible permutation of LEFT, MIDDLE, and RIGHT. ...
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0answers
36 views

Efficiency of a planetary gearbox as a function of the lubricants viscosity

So I have a client that is asking about if they should switch from one lubricant to another in a planetary gearbox they have. The main advantage that this new lubricant has is that it has a much ...
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0answers
19 views

Looking for a suitable tensile tester

Does anyone know of tensile testers that satisfy the following conditions? Has a motor that can work in a vacuum environment Has dimensions less then 7 inch by 7 inch by 10 inch These aren't hard ...
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16 views

Minimum valve sizes

I'm designing a cylindrical conductivity cell with an insulating liquid dielectric (r134a, kerosene/diesel (?)) in between the two cylinder electrodes (SS 316). The space between the electrodes should ...
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1answer
33 views

Calculating area moment of inertia for a beam with underslung plate?

In a number of designs, a beam will have an underslung welded plate attached, as shown below: In this sketch, a symmetrical standard steel beam/column of dimensions H1 x B1, with web and flange ...
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Is there some temperature at which all “5w” oils should have about the same viscosity?

Is there some temperature at which all "5w" motor oils should have about the same viscosity? (5w-20, 5w-30, 5w-40, 5w-50, etc.) I am looking for SAE or ASTM wording or chart that says it straight ...
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2answers
55 views

Motors that would work in a vacuum

What are some examples of motors, preferably less than $300, that would be able to function in a vacuum?
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43 views

Thread identification

I am having a very difficult time identifying this thread. This part is a plug that I am trying to replace because the threads were stripped. The best fit for pitch is 11 threads per inch (imperial), ...
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0answers
44 views

What mechanism do I use for this pen-like design?

I am trying to make a pen-like product that moves out fluid from its tip for some special chores, but I am having issues about the motion of the clutch. The picture you see is a sectioned concept ...
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1answer
26 views

hydrostatic storage of gasses

This question is a bit general but hopefully someone can point me in the right direction. If you have a metal container, welded shut that's fitted into a hole that is say 10 meters wide and 30 meters ...
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3answers
57 views

Will electroplating a ventilated brake rotor with copper improve its cooling capacity and maximum its lifespan?

Since copper is excellent at dissipating heat and does not rust, I am surprised that brake manufacturers do not electroplate cast iron/steel brake rotors with a thin layer of copper (~.5mm). There are ...
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1answer
41 views

When designing scissors, how do you design the blade geometry to ensure good cutting capabilities?

I have been looking online and found there should be two points of contact, one in the blades and one in the pin. In order to achieve this, I assume there's a slight angle of the blades into the ...
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1answer
45 views

What is the axis of a pipe?

Sorry, it seems like the answer to this question is just a quick google search away; but I have not found a page defining what the axis is. My guess was that the axis of a piple is the imaginary line ...
2
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1answer
68 views

Ackerman steering

I'm designing a steering mechanism following the Ackerman principle. I've met the condition that my steering arms' normal projections must cross in the middle of the rear axle however when I do a turn ...
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20 views

Can you convert the two equations into their block diagram representation in Simulink?

(Reference Material: Modeling & Analysis of Dynamic Systems) $$\begin{align} \ddot x_s &= \left(\dfrac{1}{m_s}\right)\left(P_0 - R_{s1}\dot{x}_s - K_{s1}x_s - R_{s2}\left(\dot{x}_s - \dot{x}...
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2answers
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Why are moulds sometimes dimensionally larger than the metal components they make?

I have this question and I can't seem to find any sources which I can used to determine a potential answer.
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2answers
33 views

Coupling of load cell with a plunger

We are using a load cell as shown below, the data sheet for which can be found on this link. The load cell needs to coupled with a plunger as shown below. The plunger is supposed to measure the ...
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0answers
55 views

Bearing stress v/s crushing stress

What is "Bearing stress" and Is it different from Crushing stress? If yes explain How? and When does an element come under Bearing Stress? This question came to my mind while studying knuckle joint ...
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2answers
44 views

Engineering Drawing-Projection of intersection curve of two standing cones

I have this projection of two intersecting cones, and I am asked to draw the intersection curve of the two cones on the projection. What is the right way to do it?
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Viscoplastic model of solder alloys

I have found some data of viscoplastic Anand model for the SAC305 solder joint of electronic devices in the literature. Does this data depend on the thickness, length and width of the joint? I mean ...
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1answer
30 views

Along which direction is the area moment of inertia taken in bending moment equation?

Is it in the same direction of the applied load or in the co-planar perpendicular direction to the load applied?
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1answer
38 views

Power transmission via a SHAFT

Recently in the class of MACHINE DESIGN our teacher gave us a Homework to find out: Whether or not a single SHAFT can operate at two different magnitudes of TORQUE? The actual question by our ...
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3answers
68 views

Truss Analysis Problem

In this case, L, theta and P are given, there will be 4 reactions at the wall? (2 horizontal and 2 vertical). $$\begin{align} \sum F_v &= 0 \therefore F_{v,B} + F_{v,A} = P \\ \sum F_h &= 0 \...
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3answers
35 views

How to make a choice between rolling element bearing and journal (plain) bearing?

I wonder if there exist a formal guideline to help engineers choosing the right type of bearing. Except in some few cases, this is not very evident to me. As far as i know, the plain bearing ...
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0answers
20 views

Tundish Lift Lower mechanism

I have two no of motors connected in parallel of 7.5 kw max current capacity 30Amps. The load is about 18Ton is the motor sufficient to lift this load. The mechanical arrangement of screw jack system. ...
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1answer
29 views

Direct Optimisation - How to Create Time Efficient Study

I made a simulation of this cylinder that is being suspended mid air and held up by 8 rods, 4 on top and 4 on the bottom. The entire model is cooled to 15K I managed to find the forces required for 6 ...
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0answers
27 views

Fusion 360: Measurement issues to Slicer Software

So I made a design for the Autodesk Competition but for some reason, I have never had this issue, but when I export to .obj and open in S3D, it doesn't convert the measurements. My meaning: I have a 3....
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0answers
21 views

Machanisms for releasing stored spring energy

I'm trying to design a small system with a compressed spring and a release mechanism, but i'm not sure what mechanisms are out there for this type of application. The spring force will be very high ...
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1answer
40 views

What is the torque required to rotate a 450 lb., 35' long cylindrical load 90 degrees?

I need to create a simple machine to assist in rotating a cylindrical load, akin to a roll of carpet, from a horizontal position to vertical. The load weighs 450 pounds, which is distributed evenly ...
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What are non input angles in a linkage?

I am studying rotatability conditions (Ting) and there it is written that for class 1 kinematic chain ,there must be at least one and only one long link between two non input angles .what is meant by ...
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Condensation Expansion turbines

I am working on a project involving a steam expansion-condensation turbine. I am the only one in on the project and I am unsure of how to start. I am trained in chemical engineering and have a black ...
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1answer
43 views

Bevel gear design & usage

The problem : I need to create a mechanism with 2 parallel shafts, at some distance apart, rotating in the same direction, either clock- or anticlock-wise. The distance (> 1m) makes it impractical to ...