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CR4 - Recent Forum Threads and Blog Entries

Recent content from CR4, The Engineer's Place for News and Discussion

Published: Sun, 23 Oct 2016 09:43:08 EST

Copyright: Copyright 2016

Sealing Water Pressure in a Mechanical Seal

Sun, 23 Oct 2016 09:43:08 EST

I tried to search in the google for finding the Cooling Water Pressure for the Mechanical Seal of the centrifugal pump. The google link displayed many many choice, but I could not get the detail for this in question The manufacturer of the mechanical seal wants a pressure of the cooling water 5 to

NFPA 70 2014 electrical standards

Sun, 23 Oct 2016 07:39:21 EST

hi fellows, can anybody share soft copy of NFPA 70 2014 electrical standards? regards.

HDTV sans sound

Sat, 22 Oct 2016 18:36:21 EST

I have a 32" flat screen TV about 1 year old that has lost it's sound. I have replaced it with a new TV and wonder if the old TV can be used as a computer monitor. Since I do Autocad©, a big screen would be great.

One Way Bearing Usage

Sat, 22 Oct 2016 06:53:21 EST

0down vote favorite I am developing a motorized cable reel. I am using a geared DC motor to drive central cable drum on which the cable rests. This cable reel is only used to automatically retract the cable back once the cable is pulled out. The cable is pulled out manually by hand from t

Direct CO2 to Methane Conversion Using Affordable Catalysts?

Fri, 21 Oct 2016 12:55:21 EST

This is WAY outside my box. Would anybody be willing to comment on the significance of this?

Timing Chain

Fri, 21 Oct 2016 00:07:40 EST

Good day Have been engaged to redesign the timing side of petrol motors from gears to chain. Because of the restraints of the exsisting castings I have settled on inverted tooth chain 6.35" pitch ... some how when I go looking for a standard iso - din or etc cannot find a listing ... does anybody

More Evidence For Planet 9

Thu, 20 Oct 2016 12:27:17 EST

Apparently the Sun has a slight tilt that can be explained by the existence of the previously conjectured Planet 9. What is Planet 9?

How to Write a Matlab Code for Discrete Wavelet Transform?

Thu, 20 Oct 2016 10:31:35 EST

How to write a matlab code for discrete wavelet transform(DWT) for image denoising.Is the syntax for wavelet programing and C programing is same? I am writing a thesis at best essay writing services on the topic speckle noise reduction in satellite images using wavelet transform and bilateral filter

Can Anyone Answer My Hypothetical Question About Filters?

Thu, 20 Oct 2016 09:48:47 EST

As I understand it, the ideal frequency response for a filter is that we want maximum gain in pass band, a vertical or instant cutoff and 0 in the stop band, however this is ideal and can never be achieved in real life. Along came Butterworth and found a relationship / formula for choosing the righ

10CrMo9-10 P no:5A or Unasigned Material ?

Thu, 20 Oct 2016 09:18:30 EST

Dear All According to ASME Sec.IIA SA/EN 10216-2 is identical with EN 10216-2:2002 + A2:2007 with additional marking requirements. Table QW-422 of Section IX lists the material as "SA/EN"10216-2 10CrMo9 , not Is it possible to consider 10CrMo9-10 pipe as P number 5A acc. to Section IX Table QW-42

Engineering Professions in Top 20 of 2016 Jobs Rated Report

Sun, 23 Oct 2016 04:00:00 EST

Did you know that Information Technology & Engineering are two of the most lucrative sectors for job seekers in a buyer's market? IT & Engineering withstood the job-market impact the Great Recession brought to other industries. The competitive wage potential, high growth outlooks and sheer

Power from Dam Conversions

Sun, 23 Oct 2016 04:00:00 EST

With U.S. engineers seeking out new, cost-effective ways to produce clean and sustainable energy sources, some are looking no further than the country's 80,000 dams. According to Engineering360, only about 10% of these dams are currently producing hydroelectricity. Yet a recent report conducted by t

Lasers + Food = Fun

Sun, 23 Oct 2016 04:00:00 EST

Sometimes you need a laser to etch/engrave tools, parts or other electronic components. Sometimes you need to use a laser to cut out gears, gaskets or other pieces for prototypes. And sometimes you need to laser something, well, just because you can. Like we did last year around Thanksgiving. So it

Welding Technique Could Benefit Auto Assembly

Sat, 22 Oct 2016 04:00:00 EST

A new welding method, dubbed vaporizing foil actuator welding (VFAW), claims to create bonds 50% stronger than those produced by common welding techniques — while consuming one-fifth the energy. In addition, VFAW can join widely disparate combinations of metals. This enables manufacturers to m

The Dangers Facing Smart Homes

Fri, 21 Oct 2016 04:00:00 EST

All too often, the designers of wearable and smart home devices overlook vital security measures, exposing consumers to privacy and safety threats. In this article, the Online Trust Alliance highlights the "glaring failures" found in these systems, covering issues like network pairing control, commo

Caption This for 10/21/16

Thu, 20 Oct 2016 20:45:00 EST

This week's image: Be sure to vote for your favorite caption! Thanks to HeadsUp for submitting this image.

Miura, Gullwing Mercedes up for Supercar of the Century Honors

Thu, 20 Oct 2016 13:00:00 EST

Most of us will never drive one, let alone own one – their rarity and rarified price tags define them, after all – but supercars nevertheless inspire many a debate when it comes to pairing superlatives and automobiles. Fastest? Most advanced? Most expensive? Which made the topic a perfec

Cursive vs. Manuscript

Thu, 20 Oct 2016 04:00:00 EST

Do you write in cursive or manuscript? Do you write in a mixture of the two? Whether or not to teach cursive in elementary schools has been a debate in the recent news with strong opinions on both sides. Cursive emerged from Renaissance Italy, perhaps partly because lifting a delicate quill off an

New 3D Technology Breaks the Size Barrier

Thu, 20 Oct 2016 04:00:00 EST

Does size matter? If you're talking about 3D printing, it used to. Precision printing meant a fixed platen and a limited range of motion for the deposition tool. Less precise printers have been developed to create large objects from clay, concrete, and other building materials, but their extended ra

A Motorcycle So Safe You Don't Need a Helmet

Wed, 19 Oct 2016 18:20:36 EST

Story time! Long before I stumbled down the amiable career path that is technical writing, I was a writer and editor for the obituary section of a large newspaper. It was…interesting. It was depressing being in the business of death. It was comforting knowing that I was helping families grie