Engineering - Questions and Answers

Air Compressors
By DuBois in Mechanical Engineering
What is the difference between a medical air compressor and a medical breathing air compressor?
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Pungent Odour Removal System
By Guest in Manufacturing
Hi, ours is a food industry wherein for one of the products, we have to blend chilly powder alongwith salt in the rotating blender.While feeding the chilly powder and removal of the blended salt ,the pungent odour is causing inconvenience to the all of us.The room is a closed room and appre ... more
Magic Mirror/glass
By haricool in General Discussion
Hi, Good day to all. In some picture, I'd seen a mirror/glass(I don't know which name is more suitable) with two appearance.. a)One side of it act like plane mirror (ie., we can see our face) b)Other side of it appears as a transparent glass ( ie., we can't see our face) Is ...
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Need to Buy Air Compressor!
By IngEli in Mechanical Engineering
Hello dear friends! How is going there?? My one of my friends has a packing factory and he need to buy a new one air compressor, and he asked me to chose one. But i am not so familiar with air compressor. So can you help how to chose a properly one for him. He has 6 machine of p ... more
3 Phase Variable Motor Speed Controllers
By bullvine in
Electrical Engineering
I need to build a speed controller for two 3 phase motors which are parallel to each other and they are connected by means of two ring gears. they are used to vibrate a base plate. each motor has to turn in the opporsite direction from each other. I know I can buy starter boxes i just need to use an ... more
Blackout When Gas Turbine Changes From Gas to Oil
By thieumv in Mechanical Engineering
I have 5 Solar gas turbines which normally running in gas When gas pressure low/loss, they are changed to oil Due to change over at same time, oil supply pressure drops very quick and can not meet the turbine required presuure, it results in black out If I install addition ... more

How to Coverter from 110v 60Hz to 240v 50Hz
By aikhh in Electrical Engineering
Dear Alls, I have an air conditioner which is operate at 240V 50Hz 2.5HP single phase,now i want to install at my fishing yatch which power supply is 110v 60Hz. I brought an step up transformer 110v 50Hz to 240v 50Hz at transformer shop with the size of 25000va. connect to 110v 60H ... more
1999 Jeep Cherokee Sport Air Conditioning Problem
By popcornwizard in Automotive
The gas leaked out over the winter and I had it recharged. It worked beautiful for about 3 days. Found that the evaporator had the leak. It was replaced (very expensive due to labor). Now the AC works but does not get as cold as it should even on MAX. position and low speed fan. Now, they say its th ...
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Canflo Filters, Who Are They Now?
By RVZ717 in General Discussion
I'm currently working on a project, which was originally built 20+ years ago. I'm getting part info from the BOM on this ancient hand drawn schematic. I've been able to source everything but this little filter/strainer made by Canflo. I cant find anything on the Web, and I'm completely unfamiliar wi ... more
I Think my Alternator is Bad? Help Plz.
By Ice-Man in Automotive
hi me again and it about my car again as you may know i have a 1988 Chevrolet Celebrity. this time i was driving home form work and the battery started to die. so i was pumping the gas so it would make it home. so i put in another battery in. then i went to the gas station and fill up. the ...
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Pressure Differential on Closed Butterfly Valves
By Steve in Vegas in General Discussion
Does a pressure differential between upstream and downstream have any affect on a closed butterfly valve?
Universal Color for HVAC High Pressure System
By Sinia in Mechanical Engineering
I need to know what color is used to identify a high pressure HVAC system. I mean, there are color-coding for almost anything, like green for safety, red for danger and emergency, yellow for caution, etc.
Carbon Vacuum chamber or epoxy
By grav01 in General Discussion
My friend has a large carbon steel horizontally orientated vacuum chamber measuring 5x7 feet. He uses it for aluminum deposition. For the past few months we've been trying to drop the pressure into the 10^-6 Torr range. Aside from all the real leaks we found the chamber does not pass the white glove ... more
Chicago Dreis & Krump model 810L
By rustydog in General Discussion
Anyone have any manuals for this press brake. Particularly maintenance or PM suggestions. I have no idea what oils to use in the reservoirs, etc. Haven't had much response from Dreis & Krump. Any help will be greatly appreciated, thanks.

New Blog Entries
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Review: Popcorn Hour A-110 & Popcorn Hour C-200
posted in TeknologikL
Note: My experiences are with the PCH A-110, the PCH C-200 will be released soon and have all the features of the A-110 plus much more. A few weeks ago I posted about Media Center Extenders, and explained the features and benefits of having such a device t ... more
How Does Windows 7 Compare to Vista? (Part 1)
posted in
Software for Engineers
Microsoft's newest operating system, Windows 7, isn't due for release until October 22, 2009, but you don't have to wait until then to try it out. The Seattle-based software company has already released a test version of the OS that you can download and use for free. During testing of some commo ... more
The Biomechanics of Dance: Tap, Clogging, and Irish Step (Part 3)
posted in Sports Fitness and Nutrition
Hello again! After analyzing the more refined styles of ballet and jazz in Part 2, I'd like to discuss some more upbeat choices: tap, clogging, and Irish step. For those CR4ers who might be new to this series, I'm an engineering student at Rensselaer Polytechnic Institute (RPI) and a National Cl ... more

Cobra Daytona Nets $7.5 Million
posted in Hemmings Motor News Blog
Back in 1967, Bob Bondurant sold a Cobra Daytona for a paltry $4,000. Over the weekend, Bondurant (pictured above right in the red shirt) watched a Daytona cross the block for an astounding $7.25 million at Mecum's inaugural Monterey sale, setting a record for the highest price paid for an Amer ... more
Caption This for 08/28/09
posted in Caption This!
This week's image: Be sure to vote for your favorite caption! Thanks to DCaD for submitting this image.

Latest Topics of Discussion

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A Joke/Maybe More?
By Transcendian in General Discussion
So this Engineer ends up in Hell. He goes, man, it's hot here. He asks the Devil, "Can I do something about this heat?" The Devil says, "Do whatever you want." So the Engineer builds a great AC system, cools the place down. He makes an Ice maker, they get a nice Tiki bar going, and star ... more
Voltage Booster Challenge for Low Voltage Sourced Power
By Shyam in New Technologies & Research
I am interested in a voltage booster mechanism for a very low voltage source of high current. To start with we take 100mV 10A, 200mV 5A sources to be boosted to say 3-6V range without any external power source. It is not possible to have many such voltage sources and there is only one such low vo ...
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Star Wars Collection to Change Hands
By PWSlack in General Discussion
A Swindon man with an obsession for Star Wars has decided to sell off his enormous collection of memorabilia. Interesting, this link is.
Ct Burden-Electrical Engineering
By nagarajansuha in Electrical Engineering
dear all, i have one doubt regarding ct burden. one current transformer is having the specifications as 100/1A,5P15,10VA. and is used in 25 years old switchgear. now i want to replace that switchgear with new one. will it affect the existng protection philosophy when we change the ct specif ...
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Follow Up, Engineers, Do I Leave my Conscience at the Door?
By 2tinker in General Discussion
Hello all, (This is a true long winded story) I posed the question on 4-1-09 and I received a fabulous number of responses. It was a growing experience for me and I would like to share the outcome with you as light- heartedly as possible. The backg ... more
Clinching the Engineering Cliche!
By Brett Johnston in
Automotive
Knowledge that voices superiority through rhetoric has already proven to be a human downfall so here's my request for consideration of modern engineeering rhetoric: Low to the ground cars cause flying downwards by extending the path of air over the vehicle and shortening the path of pressur ... more

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