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1500 questions
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2 answers

Method for determining pump characteristics

I have a rotary pump and want to gain knowledge about its characteristics. I have an uncalibrated flow meter. At best I want to get a flowrate/pressure-diagram. I understand, I need to analyse the flow sensor in advance. Things I have: Voltage and…
Ariser
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High RPM - Stepper vs Brushless Motor

I need to spin a threaded rod to raise a picture on a frame. The weight of the picture + the parts that it hangs on will be around 6 pounds. Two motors are going to be used to lift it via threaded rods (like in 3d printer platforms) but I need them…
Magic Lasso
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Rotary Motion to 180 Degrees Reciprocating Mechanism

Are there any established solutions for truning a gear (or wheel) half-circle in one direction, back in the opposite direction, and repeating? Mechanism must be driven by a motor and continuous rotary motion. Compact and simple mechanisms preferred.…
skibulk
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How many blades for a steam turbine?

I am building a very simple turbine that runs on steam. I want to make it as simple as possible, thus avoiding impulse and reaction turbines. I want to design the turbine to fit in an exhaust pipe (about 15cm diameter) so that steam would rotate it,…
Mohdak
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Estimating the time required to heat a rod by a certain $\Delta T$

Consider 1D heat conduction on a rod of length L. Assume the rod has a known density $\rho$, specific heat $c_p$ , and thermal conductivity $k$, all of which are constant with respect to temperature. Suppose that the initial temperature of the rod…
Paul
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What metal material to use for stove exhaust pipe?

If biofuel is burnt, for example wood, and the stove I am building is made of metal, what is the most appropriate metal material I should use to avoid excessive corrosion in the exhaust pipe of the stove?
Mohdak
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Frequency dependence of electromagnetic shield metal

I know that the effectiveness of metals used for electromagnetic shields heavily depends on the used frequency or frequency range. I could not find a resource in the web (tables or graphs) that give me the information which material (especially…
Silicomancer
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Terminology for ponding behind a bridge during a flood

I have read a specific term to describe the process when water pools behind a restriction such as a bridge during a flood. I cannot for the life of me remember what the word was. The term specifically refers to the process of the ponding of water…
octopi
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Reinforced Concrete Columns - Interaction Diagram Question

I'm confused about some concepts concerning interaction diagrams for reinforced concrete columns. Hopefully somebody will be able to answer these: Point with zero tensile strain, but before uniform compression (no moment) In the calculation for…
Grady F. Mathews Iv
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Can drawing views in Solidworks be scaled without keeping aspect ratio?

I'm making weldment drawings that involve a long W-Beam with a number of flanges welded to the web. The problem is that because the weldment is so large, lines become difficult distinguish from each other when the weldment is scaled to fit the…
zan
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Logic gates for an indicator light to show the state of two sensors

I've attempted to answer the following question and I need to know if I am on the right track: LOGIC GATES Question 3 A manufacturing plant uses two tanks to store certain liquid chemicals that are required in a manufacturing process. Each tank…
n0t_a_nUmb3R
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Calculate thermal flow for air flowing through a tube, with fins

I have the same problem as described in this question: How to calculate the resulting temperature for a stream of air through a hot tube?, but I want to increase the transferred heat by adding fins onto the inner side of the tube, parallel to the…
arc_lupus
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"Micro Inverters" vs "Pure Sine Wave" for Solar Systems

Regarding micro inverters for solar power systems: Is there technically a difference between an inverter classified as a "micro inverter" and and inverter classified as a "pure sine wave" inverter? Or is it simply a matter of using extra jargon to…
Cory
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Suggestions for low friction surface materials for a "beltless static treadmill"

I'm currently developing a treadmill for clinic gait research. If I were to build a flat treadmill with no moving surfaces what materials or coatings would be worth exploring as walking surface. Ideally, the surface would be durable, safe to touch…
piman
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What is the exact meaning of "dot product of the pressure and viscous force coefficients on each face with the specified force vector"?

I studied a thesis about a axial turbine and but i didn't understood the bold part of following sentences. What is the exact meaning of "dot product of the pressure and viscous force coefficients on each face with the specified force vector"? This…
user19061
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