The Stack Overflow podcast is back! Listen to an interview with our new CEO.

Questions tagged [mechanical]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
1answer
42 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?
-1
votes
2answers
46 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 ...
2
votes
4answers
673 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?
0
votes
0answers
31 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 ...
0
votes
2answers
64 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 ...
1
vote
1answer
37 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....
3
votes
3answers
117 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: ...
1
vote
1answer
39 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 ...
0
votes
2answers
61 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 ...
0
votes
1answer
28 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) ...
3
votes
1answer
45 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 ...
1
vote
1answer
37 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 ...
3
votes
3answers
78 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....
6
votes
0answers
84 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 ...
0
votes
0answers
23 views

How do you determine the Maximum Radial Load in Linear Actuators

should the maximum radial load be considered? A linear motor has a Maximum Load of 500N and a 300mm Stroke Length. There will be instances that the Linear Actuator will have a Vertical Force while ...
0
votes
1answer
108 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 ...
1
vote
2answers
44 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 ...
3
votes
2answers
142 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 ...
0
votes
1answer
25 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.
1
vote
1answer
72 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 ...
0
votes
1answer
44 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 ...
0
votes
1answer
60 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
0
votes
4answers
100 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 ...
0
votes
1answer
42 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 ...
0
votes
1answer
89 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 - ...
0
votes
1answer
29 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 ...
0
votes
1answer
63 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 ...
0
votes
0answers
17 views

What is the philosophy behind the design of the standard (ASTM D638) dogbone sample? [duplicate]

Why is it designed specifically that way? What is the importance of the Width/Thickness ratio to the gauge length ? I am carrying an experiment on correlating test results to standard test samples ...
0
votes
0answers
36 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?
0
votes
2answers
62 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
0
votes
2answers
29 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 - ...
1
vote
1answer
52 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 ...
0
votes
1answer
93 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 ...
0
votes
1answer
52 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 ...
-1
votes
1answer
56 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?
1
vote
0answers
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 ...
1
vote
1answer
53 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 ...
1
vote
0answers
43 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 ...
1
vote
2answers
67 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 ...
0
votes
1answer
100 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 ...
2
votes
1answer
146 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 ...
0
votes
1answer
35 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 ...
0
votes
1answer
76 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?...
3
votes
1answer
173 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. ...
0
votes
1answer
63 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 ...
0
votes
1answer
46 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 ...
2
votes
0answers
90 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.
2
votes
0answers
35 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 ...
1
vote
1answer
265 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 ...
0
votes
1answer
69 views

How would I most easily create a mechanical intervalometer for a digital camera?

i.e. a battery powered device which presses a digital cameras capture button at some constant interval of ~60 seconds. Would it be an easy project for someone with little experience with electronics? ...