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1500 questions
4
votes
4 answers
Difference between temperature and heat
It is becoming very difficult for me to understand the difference between temperature and heat.
About heat all I have read :
Heat exchange is related to as exchange of matter + energy.
Heat is related as total kinetic energy of molecules.…
S.M.T
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4
votes
1 answer
What does MM prefix mean in MMtoe?
I was reading documents about energy importation and came across the following:
The import was of 5,915.87 MMtoe
I wonder if MMtoe = $10^6*10^6$ toe = $10^{12}$ toe.
First time coming across a unit expressed like that.
RMS
- 275
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4
votes
3 answers
Linkage of two shafts that need to rotate different angles
I have two switches that have different throw angles the switches have shafts coming out of them which are connected the the cams that can be seen in the attached pic. One needs to rotate 95 degrees to throw and the other 83 degrees to throw, the…
Cooper
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4
votes
2 answers
Why do monocrystalline solar cells have rounded/cropped edges?
What is the meaning of this croped part? Why do they crop it, rather than let it be full square?
PhysicsSolvesAll
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- 2
4
votes
1 answer
What is this "clamp" place on a piece of bar stock while turning it in a lathe for?
I am watching a Youtube video depicting someone machining a crankshaft for a miniture rotary engine. Around the 4:27 mark after preparing some bar stock the person in the video places some sort of clamp on the stock before putting it into a lathe…
KDecker
- 141
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4
votes
6 answers
Increasing torsional-stress resistance of an Auger at its motor-shaft joint
An auger is used to move plastic balls and is rotated by a stepper motor. Due to the balls getting jammed sometimes, this induces stress on the auger at the motor-shaft junction and breaks. Images below describe the issue…
Amol Patravali
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- 3
4
votes
0 answers
Hydrostatic transmission to directly translate movement
I have been thinking about small hydrostatic transmission to directly translate movement of stepper motor (NEMA 17-23 size, geared with 3:1 or 5:1 ratio).
My design currently involves 2 identical radial piston motors/pumps with 3 cylinders all…
janherich
- 141
- 2
4
votes
3 answers
Get average shape from 10k + files
We have a ton of ergonomic data in STL files. We would like to use that data to define a basic shape for our designs. So what i am looking for an algorithm or software solution that is able to scan the data and calculate an average shape. I have…
Chris Holstein
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- 1
4
votes
0 answers
understanding observers and estimators
I have seen several forums related to this question about the difference between observers and estimators in control theory and could not understand it clearly. I wanted to know how the state estimators and observers originated in first place. What…
gari
- 61
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4
votes
1 answer
Oval aeration tanks - what are they called, what are the key differences in operation to circular tanks?
Consider this overview picture of a WWTP:
In the back, you see two oval tanks with bridges and walls, separating an inner from an outer area. These are aeration tanks.
Is there a specific reason to build them like this, instead of circular, or is…
mart
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4
votes
1 answer
Cleaning tape for automatic part cleaning during manufacturing
Is there something like a consumable cleaning tape for automatically cleaning parts during manufacturing? Some parts need to be cleaned before automatic assembly, e.g. magnets before adhesive being applied to one of their surfaces. Tape may be…
PSz
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- 4
4
votes
3 answers
Electrochemical protection for corrosion
When we have a part that tends to corrode; Is it possible to apply an electrode on it to sense the excess or deficit of electrons on it that make it prone to corrosion and accordingly send a current that will drive that excess or deficit of…
sloupioc
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4
votes
3 answers
Specific heat at constant volume used in non constant volume processes
I have commonly seen that the work for an isentropic compression is written as:
$$
W_{in} = c_{v}(T_1 - T_2)
$$
What confuses me is that since it is a compression (volume is changing) why do we use the constant volume specific heat?
Thank you…
RMS
- 275
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4
votes
2 answers
What does "crs" mean in structural engineering / construction?
In the realm of structural engineering, construction, foundation design, what is "crs" when talking about piles/posts? Is it an abbreviation? Does it refer to some sort of size?
Some examples:
Greendrake
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4
votes
1 answer
Why is the Stress vs strain diagram preferable to the Load vs displacement diagram?
I’m really unsure what is the difference between stress vs. strain and load vs displacement graphs and why stress-strain is better.
I know that the units are different:
stress is in MPa and the load is Force N
and strain is no units and…
Emmanuelle
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