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Conference Room 4 (CR4)

Conference Room 4 (CR4)
Conference Room 4 (CR4) is a forum for engineers, scientists and technical researchers to discuss engineering news, seek technical help and get answers to burning questions.
Articles: 1, 2, 3, 4, 5, 6, 7


Center line for an eccentric reducer
2012-06-01 00:25:00
What is the best way to find the center line of an eccentric reducer?
Caption This for 06/01/12
2012-05-31 23:45:00
This week's image: Be sure to vote for your favorite caption! Thanks to baxter for submitting this image.
Website Pet Peeve
2012-05-31 22:25:00
Why do so many websites waste valuable space with huge (essentially) blank fields that make it more difficult to use the website? Here are 3 examples, including CR4's, shown below. I include MapQuest, too, though Google Maps is about equally guilty. You can't get as much actually mapped area onto t
2012-05-31 21:53:00
hello friends...please clear my doubt. when I checked the continuity between the clean earth and dirty eath with mutimeter RED probe on Clean bus bar and BLACK on Dirty busbar,it showed open.But when I changed the probe with Black on clean and Red on dirty it showed closed.WHY? can you please clear
2012-05-31 21:42:00
1) why Clean earth and dirty earth are seperated and connected together at last.? 2) what is the resistance between the clean earth wire / dirty earth wire with respect to the common earth rod.? 3) Field instrument cable shields are not connected to the earth in the field junction box. why? 4) Fi
We'd Recover Faster With Less Showrooming
2012-05-31 21:30:00
A couple days ago, I wandered down to the local Barnes and Noble to get out of the house, see if I could prove I still exist, and to add to the pile of research for the next story I'm writing. Let's see. Marketing. S for Safko. The Social Media Bible, 3rd Edition. Chapter 21, Interpersonal To
electrical seminar
2012-05-31 20:47:00
suggest some latest semiseminar topics for final year electrical diploma student
Supersonic vs Subsonic
2012-05-31 19:33:00
I'm having trouble trying to model what's going on in a gas system. The system: a 10" piping with natural gas is flowing (intermittently) into a blowdown silencer (9 ft in diameter). Immediately before the blowdown silencer is a restriction orifice. The gas upstream is at 1200 psig and we expect a
Php Problems
2012-05-31 18:32:00
I dont seem to understand stand why anytime i try logging on to phpmyadmin on xampp server i kip gettn dis error messgae. Error MySQL said: #2002 - The server is not responding (or the local MySQL server's socket is not correctly configured) Connection for controluser as defined in your configu
Make, Model, Year: the Stanley Cup
2012-05-31 17:09:00
I suppose this is going to be one of those blogposts where I mention how something is made, go over a few specifications, make bad jokes, and otherwise ramble. Yes, I am talking about the Stanley Cup . How'd you guess, mate? ...via Hockey Chump From facts and materials, to history and misadven
Design of Shaft
2012-05-31 16:07:00
How to design the Conveyor Drive roller Shaft diameter for the below given data . Conveyor Width - 1 meter Length - 6 meter Geared motor Rating - 2.2 KW , 1450 / 55 Load on the conveyor - 100 kg
What to Know Before Buying a Vintage Race Car
2012-05-31 16:00:00
Vintage racing is fun, no doubt about it. Sliding your favorite classic car around a race track while dicing with newfound friends sounds like an ideal way to spend all that free time you keep hearing about. I've been involved with vintage racing since the early 1990s as a driver, crew membe
Reasons for Gear Shaft Failure in Integrally Geared Centrifugal Compressor
2012-05-31 15:59:00
In a four stage integrally geared centrifugal compressor a large bull gear shaft is coupled to 5 MW electric motor (1500 rpm). Bull gear is meshed with two pinions, 10000 and 12000 rpm (180 deg apart). Each pinion is fitted with two overhung impellers on either side. While starting the compressor,
Researchers Claim Coating Can Eliminate Some Air Pollutants
2012-05-31 15:23:00
From The Engineer - News: A nano-coating developed in Spain is claimed to eliminate certain air pollutants when it interacts with sunlight. Read the whole article
'Killer Stainless Steel': New Process
2012-05-31 15:18:00
From - latest science and technology news stories: Stainless steel is the icon of cleanliness for home and commercial kitchens, restaurants, hospitals and other settings, but it can collect disease-causing bacteria like other surfaces if not cleaned often. Scientists now are rep
More About: Killer
Dodgy Tales of 'Research' Swirling the Globe
2012-05-31 15:17:00
From New Scientist - Online News: What's wrong with science journalism in the UK, wonders Daniel Engber Read the whole article
2013 Mercedes-Benz GL63 AMG Breaks Cover
2012-05-31 15:16:00
From Inside Line Automotive News: Look for the 550-horsepower Mercedes-Benz GL63 AMG to begin arriving at U.S. dealers in early 2013. Read the whole article
More About: Mercedes Benz
Modified Bee Peptide Slays Deadly Bacteria
2012-05-31 15:15:00
From Chemical & Engineering News: Latest News: Antibiotics: Researchers tweak an antibiotic peptide from bees, making it more potent against drug-resistant bacteria Read the whole article
More About: Bacteria
America's Biggest Claw Game Plucks Oil Rigs from the Briny Deep
2012-05-31 15:07:00
From Gizmodo: Though they weigh as much as 60,000 tons, the massive semi-submersible oil rigs dotting the Gulf of Mexico can still sink when faced with a hurricane's onslaught. And there's only one way to pull the rigs' 7,500 ton decks off the seafloor after such a catastrophe-with Ameri
May 31, 1977: Trans-Alaska Pipeline a Source of Oil ... and Worry
2012-05-31 15:06:00
From Wired Top Stories: It's an engineering marvel that underscores the importance of balancing humanity's needs against nature's purity. Read the whole article
More About: Trans
Humidity Controlled Air Coolers
2012-05-31 13:34:00
I am residing in a coastal area where the normal temperatures in summer will be 42 deg. Centigrade, with a humidity of 80%, i cannot afford for an air conditioner, can anyone suggest me what is the cheapest system i can go for, so as to maintain the room temperature at 26 - 28 degrees centigrade (in
Caliper 2-Piece
2012-05-31 13:10:00
What is Caliper 2-Piece design? Is it going to give us better machinability and better serviceability and do it well used by automobiles company today?
Multiple Generators in Parallel
2012-05-31 13:08:00
When generators are operating in parallel , neutral contactors are interlocked with generator breakers to ensure that only one generator's neutral is connected to earth to eliminate circulating currents. What happens if prime mover the generator, of which,neutral is connected to earth fails and brea
How to Connect DGPT2
2012-05-31 11:40:00
I have a Type F4 Feeder typical, within the typical is a trip coil rated at 24V DC. The terminal block for the typical drawer has connections for remote Fault, remote Status and trip coil (MX). Presently i want to connect a DGPT2 to the trip coil terminal point but DGPT2 requires 48V DC and the t
Piping Problem
2012-05-31 10:11:00
Hi, In my internship , we have plumbing line of 3" size GI pipe , the service is water and it is exposed to sun ..... Now a days temperature is high around 48 C ........... The water is used for washing hands and mouth ..... Now the water from pipe become unbearable to use for human purp
CT Burden Calculation
2012-05-31 10:00:00
1) What are the factor for calculating the CT Burden? 2) How we can calculate the Saturation voltage of CT? 3) What are the formule to calculated the CT burden? 4) Is there is any effect of fault current in the CT burden calculation?
Pressure Transmitter or Pressure Transducer
2012-05-31 09:53:00
We have to caliberate the pressure excerted by the producer gas in the pipe line as it is being transported to the Reheating furnace in hot rolling mills. As the presnt one does not work as the temperature of the gas is 500 degrees celcius, I would like anybody to recommend manufacturers who can sup
Ratio of Chamfering
2012-05-31 08:54:00
Dear CR4, What is the ratio of chamfering between dissimilar thickness plates? Assume one plate is 36mm and the other 12mm
API Gauge
2012-05-31 07:46:00
Hi All can anyone help to let me know is all API thread gauge is mean for after coating or before coating .right now i machine a I.d 3" BPV before coating the gauge check is O.K but after coating the gauge cannot the coating too thick or the gauges is not mean for after coating.
Pump Cavitation Issue
2012-05-31 06:51:00
Dear CR4, We have an issue with pump cavitation on a reactor transfer pump. We wish to pump a slurry containing large amounts of small air bubbles out of a continuous reactor. Unfortunately the air bubbles coalesce in the centrifugal pump and prevent flow. Apart from changing the pump to a positive
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