# Questions tagged [mechanical]

The tag has no usage guidance.

125 questions
Filter by
Sorted by
Tagged with
31 views

### compute the maximum resisting torque that can be overcome by the system at the shaft axis

A 2Nm motor M is used to drive the system through a gear drive and a chain drive. the overall reduction ratio is to be between 16:1 and 18:1, and at an output speed of 6rpm.
50 views

### Practical consideration of truss

During truss fabrication, the truss member are usually connected by welding does behave like fixed joints not pin joint so how will that behave like truss without pin connection?
292 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 ...
703 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?
34 views

### Mechanical solution for keeping a vertical stack under pressure

I'm looking for a solution for keeping a vertical stack of small boxes under tension. I will use the device in the attached picture to hold the boxes which will have a lid on the top, and the boxes ...
539 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 ...
219 views

### How do I find the vertical reaction forces?

The horizontal Force $A_x$ is easy but how did they get the vertical forces $A_y$ & $B_y$? I tried using similar triangles for the Force and length of the sides, somehow I can't manage to solve it....
283 views

### Torque and RPM calc

started by designing the gear meshing, and now I need to calculate some parameters to determinate if this meshing works for me. The system considers an electric motor, which technical parameters are: ...
109 views

### Does turbulent river flow classify as uniform?

I found this meme in a facebook group on engineering concepts: I selected A (steady and uniform). In selecting A I assumed the width of the river to remain constant along its path and no parameters ...
199 views

### Simple Thermal Analysis for sealed Aluminum box with 3.7 Watts of heat generation internally

I am looking for a starting back of the envelope calculation to determine if an aluminum box with just free convection can dissipate 3.7W of internal heat generation or if I need to think about adding ...
36 views

### Stopping Force of Irregularly Shaped Object

I have a quick question about the force needed to accelerate/decelerate an irregular object. Lets say I have a 3D object with the following general shape, This system is in general a gripper (gray) ...
49 views

### Clutch role in a micro hydropower

I've recently visited an old (about 60 years old) micro hydroelectric standalone installation. Total electric power is about 3 kW A/C. A local told me between generator + fly-wheel and turbine there ...
203 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 ...
3k 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....
135 views

### Identify this bomb disposal equipment

A recent news item featured this photo of a WW2 bomb being prepared for detonation. Can anyone identify the purpose of the large widget sitting on the bomb? it's got a lot of cooling fins on it, and ...
152 views

### Why is there still no truly omnidirectional treadmill? (technical reasons)

Disclaimer: I'm not a (device) engineer. I don't know the terminology. So I suppose some of my statements, questions or ideas could sound either naive or vague. As far as I undestand, the most ...
215 views

### Pivoting trailer gate on multiple axes

I am currently trying to design a rear gate to retrofit to an existing caged trailer (similar to image 3), with the goal of having a system where the rear gate can pivot down (on its bottom edge) to ...
935 views

### Why do 2-stroke engines burn more oil?

Of course, most 2-stroke engines require oil to be mixed with the fuel (I appreciate there are 2-stroke engines that don't require this). Therefore, it makes sense to me that oil will be burnt during ...
100 views

### Fusion 360 animation , contact sets

I was designing a whit-worth quick return mechanism, I have provided the contact sets but they fail when I try to animate. The contact set is defined for the crank and slotted link.
544 views

### One way/locking mechanism without springs or flexible members

There a few neat mechanisms that allows only one way motion without the use of a pawl or ratchet. This is one of them: https://www.instructables.com/id/LEGO-Technic-One-Way-Gear-Mechanism/ What I'm ...
156 views

### What are fluids or “goos” called, that increase friction?

I have a shaft inside a bushing, the shaft has a gear on one end that is supposed to provide resistance to other gears it is driven with. I'm having a hard time finding the correct term for the sort ...
77 views

### Singularity function

Could you please tell me why the singularity function is one when x=0 I mean $<0> ^0=1$ Thanks you in advance
284 views

### A latch that’s easy to open under lateral pressure

My middle schooler is building a catapult that’s supposed to hurl a ping-pong ball 5 meters: The problem is that the pressure on the latch is so high that the kid just cannot trigger it: The door ...
272 views

### Polarity of a relative angle - Knee joint angle

I'm wondering if it's correct to write: $$\alpha = \theta_{lg} - \theta_{th}$$ EDIT: the theta angles are defined positive in counter-clock direcction, instead alpha in clockwise direction. My ...
367 views

### worm gear linear motion with release mechanism

I want to convert rotational motion to linear motion. Since available space is limitation in my project, I was planning to use screw jack mechanism as a lift. But screw hack has very low efficiency - ...
43 views

### How to model a driven wheel with no slip

I'm working on a design problem, and I'm having trouble figuring out how to model the torque needed to drive a bike tire at a set acceleration. Let's say I have a tire with normal force between tire ...
179 views

### How do I calculate the force coming from the centrifugal compressor exhaust?

Let's say I have a centrifugal compressor as shown in the figure and I know the following parameters----1 Thrust Inlet and outlet pressure Power required to operate the compressor Inlet and outlet ...
40 views

### How is the number of blades on a centrifugal compressor determined?

If I know the tip and hub diameter of a centrifugal compressor ,the inlet velocity and outlet velocity, how do I determine the number of blades on a centrifugal compressor?
70 views

### What is the name and purpose of this Instrumentation / Mechanical fitting

The component I am interested in is the blue "head" in the attached image. I call it the sensor head but will like to know if it has a specific industry name
56 views

### Transmission for variable-speed flywheel to output a steady output speed?

If you had a flywheel acting as a mechanical battery in an all mechanical system, such that you could pump energy into the flywheel up to a desired speed and then slowly drain its kinetic energy - ...
158 views

### Electric Motor Sizing : Understanding how much torque I need given Force

Physics has never been my strong point... I have a task to size a motor. The question is: Based on information below, how do I calculate required motor torque to accelerate a mass with the ...
238 views

### Gyroscope/Powerball gearing system for bikes?

There is an interesting and potentially useful property to do with the procession of Gyroscopes, as well as devices like the "Powerball" toy. When the gyroscope is rotating (Ws) and then force is ...
329 views

### Calculating max weight capacity of brushless motor

I am having trouble determining the maximum weight capacity a motor can handle. I provided the specs below. The calculations are for the top row or the 580KV model. So to start off,I'm only taking ...
88 views

### Moment of inertia of rotated area

I know the moment of inertia about X and Y axes. The area has been rotated through an angle theta. How to calculate the moment of inertia about x1 and y1 axes?
27 views

### Mechanism timed by wheel rotations

I hope this is not off-topic. I’m wondering if someone could please provide some examples of a basic mechanism (I’m thinking something like a bevel/spiral gear, but open to anything) that is attached ...
81 views

### How to calculate the maximum starting traction force for a train with multiple carriages?

Suppose I have a convoy composed of the following elements: A locomotive with 4 driven wheelsets (2 wheels per wheelset and therefore 8 wheels). $n$ carriages with 2 wheelsets each. Assuming the ...
58 views

### Calculating Strain gauge Values in a tensile Test

I got a question on an online quiz which leaves me clueless. I gave my best to translate the question as accurately as possible: There's a strain gauge placed upon a tension rod with a rectangular ...
103 views

### Reacting Propeller Torque?

A motor is used to drive a shaft that is geared through 1:1 bevel gears to a propeller. The shafts are mounted on bearings in a hard casing that is attached to a 2nd ground. I want to know if the 2nd ...
309 views

### How can I measure the coefficients of friction of pulleys?

I have to study several industrial pulleys made for lifting heavy weights. It is important to select one which has a low coefficient of friction because the system is based in a hoist and several ...
332 views

### Quick return mechanism for spring-loaded screw

Looking for a way to convert rotary motion to linear, but it should take less energy to get back to initial position than when going from initial position to the end position. Specifically, a screw ...
39 views

### what subject in Mechanical engineering deals with the making of External cases for electronic gadgets?

can anybody tell me what subject in Mechanical engineering deals with the making of External cases for electronic gadgets? I know I need to use CAD/CAM but I am asking this question because I want to ...
186 views

### Typical tolerances for valve lift using a camshaft?

I am working on a linear actuator for a valve. Wondering if anyone out there can point me towards the tolerances that are used for valve lift in a typical internal combustion engine using a camshaft?...
399 views

### 4 Gears in a Circular Pattern - Calculating the Proper Distances for Meshing

I have recently been working on a gearbox for a robot. I have this pattern of 4 gears with each gear connected to its 2 neighbors. It looks like this: You will probably notice something though. ...
66 views

### Analytic expressions of the kinetic and potential energy [closed]

A homogeneous rigid circular disc (radius R, mass ms, center point S) rolls without a slip on a plain with a small angle of inclination alpha against the horizontal. A point mass MG is fixed on the ...
49 views

### Compressed Air Piping Network and Flow

In our Factory we have a Compressor which rates 660 CFM (Kirloskar Make), which is a VFD Compressor. And next to compressor, we have a Receiver tank. Next to Receiver Tank, we have a Dryer. The ...
149 views

### How to calculate torque requirement for vehicle with Mecanum wheels?

What are the changes specific to mecanum wheels when calculating torque requirements for a vehicle. I have the data for the vehicles mass, top speed and top acceleration.
39 views

### Epoxy/Adhesive to bond solid wood and acrylic

I am trying to bond solid wood with with clear acrylic, with requirement to able to withstand shearing force, not more than 6kg over an area of 100 sq.cm. Have tried to bond with result of the ...
497 views

### How to prevent an object doing a full rotation on a shaft

I basically need a block on a shaft to rotate between 90 degrees (vertical) and approximately 180 degrees (horizontal) counterclockwise on a shaft. I don't want the part to fall below 180 degrees. At ...