4
votes
Matrix Calculation
Your numbers are right. You are just confused about matrix multiplication. See https://en.wikipedia.org/wiki/Matrix_multiplication (or any linear algebra textbook):
For matrix multiplication, the ...
- 2,626
3
votes
Accepted
Can I omit the scale information in the technical drawing of a mildly complex mechanical part if I provide all of the necessary dimensions clearly?
You should not ommit the scale. Even if no one seems to read it, it is still important information. The task is quite trivial, I don't see any reason why to remove the scale because it can cause ...
- 187
2
votes
Deflection of hanging beam in two parts
First work out the tip deflection due to F as if it was applied at the end of L1, and an additional moment F*L2 and the angular deflection (slope) of the tapered beam.
https://www.researchgate.net/...
- 318
2
votes
Who introduced the term "Stress" in mechanics?
Cauchy was French, so probably not. Term "stress" was used earlier for example by Peter Barlow in "AN ESSAY ON THE STRENGTH AND STRESS OF TIMBER" (1817). You may find many ...
- 865
2
votes
Why the vertical height of the liquid column remains same after tilting the tube in the Barometer here?
it's measured in the height of mercury, not the length of mercury.
- 5,875
2
votes
rotate gear while no keeping it engaged with other gears
The component you are looking for is called a freewheel, a mechanism that only engages rotation in one direction and turns free in the other direction. A common application is the connection between ...
- 1,853
2
votes
Accepted
surface roughness define how rough surface has to atleast be
I am not sure what the current recommendation in the international standards is, since in mechanics I realized that a lot of things vary from industries to industries, and in the same industry from ...
- 36
1
vote
How to calculate stiffness to weight ratio of one big tube vs two small tubes (see drawing)?
Caveat: I asked the question and give an answer here myself that takes the specific numbers given in my question and applies them to the formulas in the answer given by Tomas Letal. I do not have the ...
- 11
1
vote
How to calculate stiffness to weight ratio of one big tube vs two small tubes (see drawing)?
Lateral stiffness
Assuming the plates stay parallel, you can use lateral deflection of beam end while keeping the 0 rotation there. Replacing one of the plates with a force-moment couple, $F_1$ and $...
- 865
1
vote
Methods to cut large volumes of thin wall stainless tubing with minimal burs?
I would recommend a plasma cutter and a fixture that rotates the workpiece as the cut occurs. When cutting thin stainless (like a metal sink for example) the plasma cutter produces a completely smooth,...
- 13.5k
1
vote
How to calculate force acting on axle from hub motor with known torque?
Assuming the motor has a Torque of 40Nm, what is the force on the fork centred at the axle?
Since the system is fixed in place, there is no acceleration or rotation. Therefore any torque developed ...
- 111
1
vote
Why engine oils form emulsions?
Most modern motor oils contain detergent additives, these hold dirt in suspension so that the oil filter can remove them from the lubrication system. This also means that any water in the oil gets ...
- 13.5k
1
vote
Why engine oils form emulsions?
There are additives to the oil that can emulsify water with oil. Sometimes it helps to spread any water present throughout the oil rather than letting it collect which can help keep water away from ...
- 4,897
1
vote
Why engine oils form emulsions?
It's just their physical properties
Water and oil are immiscible, meaning they don't mix together when put together, like water and alcohol. So what happens when they are mixed and agitated (like by ...
- 5,875
1
vote
Accepted
Notation on Continuity Eqn Derivation
It just means "located at the plane $x+dx$", and it really should be applied to the velocity, not the $dydz$.
Your cube has 6 faces. Flow in the $x$ direction can enter or exit the Control ...
- 501
1
vote
I'm wondering if the parts I have ordered to be vacuum casted and made have instead been made using 3D printing
It's extremely common for vacuum forming moulds to be made with a 3D printed master part. If that master part wasn't hand-finished to a high standard to remove the layer lines, then these would be ...
- 7,614
1
vote
Bowing of a small chip on a vacuum chuck (or, maximum deflection of a simply-supported circular plate)?
The deflection you have is more than half the thickness of your plate, even if we correct the small error you made by not raising $a$ to the power of four.
For large deflection, we need to use the ...
- 21.6k
1
vote
Why robotic Lawn mowers are curved body structured?
The blade of a typical lawnmower spins around, so the "natural" shape is circular.
From there, you'd want to add on approximately as little as necessary to make room to mount the wheels, ...
- 236
1
vote
Inefficiency of intermittent burn in rockets
Yes, the efficiency would be worse.
The engine performs optimally when operating at the nominal chamber pressure. The time between engine ignition and it reaching the nominal chamber pressure varies ...
- 6,093
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