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1500 questions
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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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2 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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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
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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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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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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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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…
RSM
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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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"Twist" of centrifugal pump impeller

I suppose this is a logical extension of my earlier question here - in fact, this is probably what I was meaning to ask in the first place. I posted as "centrifugal pump", although the same concept can be observed in other (radial or axial)…
ecfedele
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Physical meaning of shear lag

What is the physical meaning behind the concept of shear lag in fibre reinforced composite structures or the concept in general for any structure?
Willis
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How to calculate if a motor is capable for a load?

I am trying to figure out if a motor I have is capable of spinning a wheel. Here is all of the information I have: MOTOR: 190 g.cm min. WHEEL: 26 cm diameter, weighs about 59 grams I imagine that I would have to calculate the linear speed of the…
electricviolin
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Advantages and disadvantages of bevel gears

What are the advantages and disadvantages of bevel gears? This is what I've already found: Advantages: possibility to change operation angle Disadvantages: must be precisely mounted shafts' bearings will be exposed to significant forces limited…
Krzysztof Majewski
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How to connect butted or overlapping fiberglass insulation

We are working on a project requiring a temperature-controlled oven for melting lead, tin and other low-temperature metals. The inner cylinder is aluminum. The heat comes from Kanthal wire, for which we needed an electrical insulator capable of…
Dov
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3 answers

Bearing to allow a sphere to roll freely

I want to know what bearings might allow a sphere (5cm diameter) to roll in-place most freely. The closest mechanism that matches what I might want to achieve is a "ball transfer", I believe the term is. I have been unable to find: - an explanation…
CL22
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Maximal thrust from water pump

For a small water pump like this one here, how can I roughly estimate how much thrust it would deliver considering the maximal pressure (PSI) and the flow rate (L/min). As a nozzle let's assume it is just a tube with a diameter d. I am a little bit…
Mehdi
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