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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16 views

Do really “all mechanical watches need to be maintained properly”?

Somebody answered this on a different question: All mechanical watches need to be maintained properly. Every year or two they should be taken to a watchmaker for a service. This will include ...
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Constructing a structure with given constraints

I have a problem where I have a few points in 3D space with given constraints (forces, moments) and I have to create one connected structure which satisfies these constraints. Are there any pre-...
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3answers
37 views

Are mechanical pocket watches inherently water-proof and last “forever”?

Recently, I bought a cheap (~$53) but elegant mechanical "retro pocket watch", newly made. That is, not an antique made in the 18th century or anything. So far, it's worked flawlessly and ...
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39 views

Would a car slip down on a frictionless banked road and situation for friction road

Here , we have a car on a banking road. Considering two cases: Frictionless and friction surface of the road. I give an initial velocity to the car by a push for a second. Then , the cases discuss ...
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14 views

Control Partitioning in presence of external disturbance force

I am simulating the dynamics of a control system that has been designed using the control partitioning technique (model-based control + servo control). I am having a query for the case when an ...
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29 views

How is a plank able to stop a spring door [closed]

So , here we have door which can get closed on its own due to spring. Agenda of Q is to put sth beside the door so that the door does not close. The Q tells us that when we put a brick of 0.5kg. Door ...
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1answer
25 views

calculate torsion in a diffrent sized shaft

first of i know it seems like a homework assignment but it does not, it is calculations i need to do at work and it has been a long time since i studied this material. so I need help to calculate if a ...
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1answer
27 views

What is the role of the cooler in the cooling system? [closed]

It would be helpful if you could give the working schematic diagram of the cooler.
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43 views

Why does a system with zero resultant moment turn after temporarily force-tilted?

Say a beam, 3m long from end to end, has a pivot placed at its centre of mass, at half its length i.e. 1.5m. Objects with weight 200N each are placed on both ends of the beam. The system is in ...
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2answers
73 views

Effects of rolling resistance on wheel angular and vehicle longitudinal speed

The differential equation for wheel speed can be given as: In here, $T_t$ is driving torque (not braking), $F_x$ is longitudinal force of tyre, $J_w$ is wheel inertia, $\dot{w}$ is angular speed of ...
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19 views

Maximum Compressive stress [closed]

My peers and I have been stuck on this problem for days and our final is in 38 hours. Our professor won't provide practice exam solutions so any advice for solving this would be much appreciated.
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21 views

How to determine minimum aluminum t-slot profile type for frame?

For a frame with dimensions 1000x1000x400, I am determining which T-slot extrusion type will be strong enough. I am considering both 30-6060 (30 series I-type, metric) and 20-4040 (20 series I-type, ...
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30 views

Weight distribution on sliding or “pocket” doors

Does anyone know if hollow sliding/pocket doors have a weight/more dense wood at the bottom of the door to prevent from swinging?
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1answer
44 views

How to calculate reaction moments and forces in a fixed axle with multiple point loads?

I need to calculate the maximum moment and reaction forces in an axle with both sides fixed in bearings, the axle is 1010mm long and has downwards forces of: 236kN at 403mm 86kN at 499mm 32kN at ...
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2answers
51 views

Servo Mechanism for Cheese Slicing Machine [closed]

I want to design a small electric machine that slices blocks of cheese. The mechanism would be similar to this video: https://youtu.be/UxvKLf4H44A EDIT: So heres a little bit more background, we ...
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27 views

Find minimum horizontal force required to keep the block and wedge stationary?

In the adjoining figure, the coefficient of friction between wedge (of mass M) and block (of mass m) is μ. Find the minimum horizontal force F required to keep the block stationary with respect to ...
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20 views

Model for dynamic plate deformation

I would like to gather ideas to model the dynamic behaviour of a plate with variable thickness. The assumption are: Small deformations. The plate is all made of the same material with variable ...
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1answer
70 views

Why does my trimmer feels heavier when it is operating and its fully charged?

I have a Philips trimmer which when fully charged feels much heavier than when it is not charged. Also , the blades move much faster when it is fully charged I.e it’s weight , speed of blades kind of ...
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50 views

Is it possible to narrow down a portion of shaft to its 1/5 of its diameter?

I designed this shaft for my center gripper. However the slot requires to be very deep, as you can see. I want to know if it's possible to produce this part. The main diameter is 30 mm and the small ...
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2answers
50 views

How do I read this schematic drawing notation for a drill hole?

It's for an NX part. I can't figure out the depths and such. I just know the placement of the 4 holes and that the diameters are 10 mm each.
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1answer
88 views

How does the diameter of a worm gear affect the amount of force needed to turn it

Can anyone help inform a discussion I'm having with fellow modellers on a model railway forum? I have a locomotive powered by an electric motor turning a 20mm diameter worm gear meshing with a spur ...
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38 views

The Hydrolock - How to build a deep sea docking system?

How do you build a docking system at deep sea pressures? Example a Challenger Deep Sea Base at 10,000 meters seawater or approximately 1,000 atmospheres? My answer below is meant to be a logic-model, ...
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2answers
41 views

How do pilots of Deep Sea Vehicles operate the control surfaces and thrusters from inside a pressure hull?

A Deep Sea Vehicle (DSV) like Trieste or Limiting Factor or now Fundouzhe have control thrusters, ballast that has to be dumped, and other equipment to operate the DSVs. But the pressure hull is a ...
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33 views

Magnetic Force - Point of Load

I am using a Magnet like this in an assembly and I am trying to calculate the torque in point P2 (see picture below) resulting from the attraction force F between my magnet and the steel part. As I ...
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4answers
72 views

If traditional grain-grinding windmills were invented today, would they look like modern wind turbines? [closed]

Assuming you, for whatever reason, wanted to design windmills all over again with modern technology, not to generate electricity, but to directly go from a wind turbine to grinding grain between two ...
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26 views

Maximum strength size thread for aluminium sheet per thickness

Is there a rule of thumb, or a table which helps one determine what is the maximum strength thread size to use for aluminium sheet? I am interested in threading 3mm, and 2mm thick sheet aluminium. I ...
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1answer
18 views

Internal Diameter or External diameter measurement? [closed]

I would like to know if there is a definite way to understand what kind of diameter is indicated on the dwg by just looking at a dwg. I work in a job profile where I need to add inspection points to ...
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19 views

Impact force of a viscous solid drop

I have a drop of molten glass (but could be every solid with high plastic behaviour), and my goal is to calculate the max force during impact. I think I could use the velocity at the impact point to ...
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23 views

Narrowing down injection moulding material selection

How do I narrow down specific values when selecting a plastic for injection moulding? My part is uniform in wall thickness and thins out where a hinge a present. Properties: Will not go under many ...
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1answer
34 views

Find a constraint relation for this Q of 3 pulleys and 2 blocks attached with string

Using any method find the constraint relation between mass 1 and mass 2. Assumptions: No friction , massless string and pulley. Q: Find constraint relation between 1kg and 2kg block. what I tried so ...
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26 views

Aluminum square tubing as cantilever

How much mass can be attached at the end of aluminum square tubing (6063 T5, 1x1”, 1/16 thick 8’ long tubing supported for the length 1’, cantilever approximately 7’. I want to run my dogs with atv ...
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1answer
48 views

How do engineers reduce vibration of system with multiple known natural frequencies? How do they design the isolation system for specific frequencies?

I have a system that is pretty much a chamber that needs to sit on the ground. I measured the transmissibility of the chamber vs the ground (output/chamber acceleration over input/ground acceleration) ...
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3answers
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Why are railroad tank cars bent in the middle?

I recently noticed that the cylindrical shape of a railroad tank car is not completely straight but has a bend in the middle. The entire tank is a bit lower there. What's the reason for this bend? ...
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1answer
30 views

Trajectory of the center of mass of a vehicle

The problem is to find the trajectory of the center of mass of a car when it is rotating and translating (after an off center collision, for instance) What i know as input is the trajectory of the ...
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1answer
17 views

Conceptual question about rotational and translational kinetic energy

My real life problem is to calculate initial translational and angular velocities of a vehicle in a loss of control to a stop. (The vehicle will translate and rotate about it's center of mass.) ...
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22 views

How to align the assembly in Siemens NX?

I rotated the assembly somehow and when I try to make a technical drawing of the assembly this happens: As you can see, the cylinder ( assembly ) makes an angle. How can I fix it ?
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2answers
57 views

Bi-directional gearbox

I want to design and create a gearbox that allows an input shaft to be continuously rotating in one direction, while the output shaft rotates one full turn in the same direction but then half a turn ...
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1answer
41 views

Pressurizing Oxygen simply and efficiently

I am an Indian, ravaged by the Covid-19 pandemic in my country. I come from a non engineering background (Physics). I was thinking about the following. If one has an oxygen concentrator, i.e. a device ...
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1answer
45 views

Push-to-eject mechanism

I'm currently designing some small-scale robots capable of both melee and laser-tag combat. For the melee component, I'd like to create small, ejectable panels that hide the laser-tag receivers. When ...
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2answers
48 views

Why is the acceleration of wedge and block equal like this

No friction at all anywhere. Let me explain the diagram in steps and the Q. green colour let us start with. It represent a wedge on which there is mass of 10kg (red colour). That’s it the first ...
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2answers
35 views

Find the acceleration of a block relative to incline plane in non and inertial frames?

A block can slide on a smooth inclined plane of inclination $\theta$ kept on the floor of a lift. When the lift is descending with retardation i.e. $ a \; m/s^2 $. Find the acceleration of the block ...
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2answers
71 views

Why does the 1kg mass move towards inclined plane here?

Assumption :All frictionless surfaces. EDIT: In the book , it doesn’t say friction has to be present but as PeteW has mentioned , i think it should be necessary too. So , in that case let me take two ...
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35 views

Why is the tension on mass m1 not 2T here?

I have named the strings as S1,S2 and S3 on diagram. T is the tension in the string. If I draw the Free body diagram for m1, I think it should be 2T force on it but on internet , it is just T. So , ...
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3answers
59 views

Mechanical joint that break at specific force

I am designing a joint which I want to break at a specific force. I want to design a 2 parts connected by a joint that breaks when a certain amount of force is applied and thus prevent any damage to ...
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33 views

Fixed end moments

If B is a roller or pinned, should the fixed end moment for AB be (wl2)/8?
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2answers
34 views

Stiffness factor of beam member

If I have a beam with the left end being "A" and it is fixed at that end and the right end being "B" with a roller support, would KAB=3EI/L??
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14 views

Is it possible to have a reference pulse interpolator for a CNC machine with dc drive?

Is it possible to have a reference pulse interpolator for a CNC machine with a dc drive? it should work with alternating current drive but I am not sure about the direct current drive. please help me ...
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28 views

Number of Kinematic Pairs

Kinematic pairs are the connection between 2 links that can have relative motion between them. But In six bar chain as shown below: There are five pairs for them to be a kinematic chain. But if I ...
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2answers
69 views

How can a mechanical pocket watch wind itself from movement, and does it really get damaged if wound “too much”?

Today I received the mechanical pocket watch that I had recently ordered. It was this one: https://www.trendhim.se/guldfargat-mekaniskt-retro-fickur-p.html#full-gallery I find it extremely fascinating ...
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1answer
22 views

Rubber that remains Elastic in Hot and Dry Application

I work for a valve manufacturing company and our customers have an application where very large volumes of hot (200F), dry air pass through our valve. As a consequence, the rubber (carboxylated ...

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