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Engineering Stack Exchange Community Digest

Top new questions this week:

Finding if an evacuated Erlenmeyer flask will implode

I’m thinking of building a CRT (I believe it can be done), but I’ve hit a snag.I am planning on using either a 1000 mL or 2000 mL Erlenmeyer flask made out of borosilicate glass (Pyrex) for the tube. ...

mechanical-engineeringvacuum 
user avatarasked byTrewbot Score of 2

At what level should the three electrodes of a floatless level switch be positioned for water level controller system?

A floatless level switch, such as Omron 61F-G (comprised of transformer and relays), is commonly used with three electrodes to control a pump. Either for filling (to prevent overfilling) or draining (...

control-engineeringsensors 
user avatarasked bys114 Score of 2
user avataranswered byDave Tweed Score of 4

PID control tank level bottle filler

i need to fix the level control of a tank that is on a bottle filling machine.The tank is filled by a pressure regulated pump. the flow is controlled by a valve. the valve is controlled by a PID ...

control-engineeringpid-control 
user avatarasked byedward pattijn Score of 1
user avataranswered byuser31256271 Score of 0

Inventor – how to cut cylindrical holes

For a long time I’ve been having trouble cutting cylindrical holes in Inventor. Sometimes I work with pipe projects (for water, sometimes sewage, etc.).Whenever I have a situation like in the picture ...

autodesk-inventor 
user avatarasked byDolt Doff Score of 1
user avataranswered byJonathan R Swift Score of 1

Why do seamless tubes have more uniform mechanical properties than welded tubes?

I’m trying to understand the difference in mechanical property consistency between seamless and welded stainless steel tubes. From what I know, seamless tubes are manufactured without a weld seam, ...

mechanical-engineeringmaterialsmanufacturing-engineeringmetallurgywelding 
user avatarasked byHeavy Metal Tubes Pvt. Ltd. Score of 1
user avataranswered bykamran Score of 1

Symmetrical crimp tool to hold two wires in 3 mm brass tubing

Figure 1. Two small sculpting tools. Tube diameters on upper tool are 5 mm, 4 mm and 3 mm. On lower tool, diameters are 5 mm and 4 mm.Figure 2. Crimp cross-section sketch.The tubes have 0.5 mm wall ...

tubing 
user avatarasked byTransistor Score of 1

Greatest hits from previous weeks:

What material is used to hold molten iron in a furnace?

When iron is melted, I guess it has to be transported and contained. I think the container in which it is has to be able to withstand higher temperatures than what you want to melt.According to this ...

metallurgy 
user avatarasked byMartin Thoma Score of 20
user avataranswered bydo-the-thing-please Score of 22

Why do hydraulic systems use special fluid - what's wrong with water?

As a hydraulics layman thinking about hydraulic systems, it seems that the important factor is to have a liquid that doesn't compress much or at all. Doesn't water meet this requirement, and what ...

mechanical-engineeringhydraulics 
user avatarasked byjhabbott Score of 29
user avataranswered byPaul Gessler Score of 49

Transmitting power over long distances what is better AC or DC?

I found this answer to a related question. The part of the answer that's confusing me is: Transmitting DC power over a long distance is inefficient. Thus AC supply is a far more efficient to ...

power-transmission 
user avatarasked byArraval Score of 43
user avataranswered byOlin Lathrop Score of 45

Why use a 'dogbone' shape for tensile testing specimens?

Why is that the shape of the tension test specimen a dogbone-like shape?I know that it is so that the deformation is confined to the narrow center region and to reduce the likelihood of fracture to ...

mechanical-engineeringmetallurgy 
user avatarasked bystrateeg32 Score of 6
user avataranswered bydo-the-thing-please Score of 10

What does "$\pm$ 0.5% F.S." mean?

I've seen it in several data sheets - it is a measure of error of some kind, of course. The problem is I dont know the exact meaning. I've seen it in the context of repeatability, accuracy and ...

nomenclature 
user avatarasked byJHK Score of 12
user avataranswered byRussell McMahon Score of 17

Calculating pitch, yaw, and roll from mag, acc, and gyro data

I have an Arduino board with a 9 degree of freedom sensor, from which I must determine the pitch, yaw, and roll of the board.Here is an example of one set of data from the 9-DOF sensor:...

mechanical-engineeringelectrical-engineeringsensors 
user avatarasked byMaltDew Score of 28
user avataranswered byMahendra Gunawardena Score of 23

Choosing of repeating variables in Buckingham's Pi theorem

What are the criteria for choosing repeating variables in Buckingham's Pi theorem in dimensional analysis? In many problems, it's solved by taking D,V,H (Diameter, Velocity, Height) as repeating ...

fluid-mechanics 
user avatarasked bysalih kallai Score of 5
user avataranswered byCarlton Score of 7
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