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General Discussion

13802 threads, 247892 comments (32 Viewing)


07/28/2015 by Yar
The reason the water closet is using more than the 1.6 gallons is: When you flush and as soon as the float valve drops water is also running into the...
Views: 10, Comments: 0

Are New Spray Paint Formulas Too Thick?

07/28/2015 by Phys
I have a dozen cans of a major paint manufacturers spray can paint product, all used about 1/4 of the volume. It is their newer line of paints adverti...
Views: 38, Comments: 5
Last comment 07/28/2015 by Phys

What Is Elon Musk's Ultimate Goal?

07/28/2015 by RAMConsult
I always enjoy reading about EVs, especially the Tesla series. If I were younger I would have signed up to work for Mr. Musk, and if I had the mon...
Pathfinder Tags: ev tesla
Views: 36, Comments: 0

Nothing is Free Anymore

07/27/2015 by ronseto
This week, my county utility district hoorked me up to county water and county waste disposal, removing me from my private well and private septic sys...
Views: 54, Comments: 8
Last comment 07/28/2015 by Fredski

This Engineer Needs Some Support

07/27/2015 by BruceFlorida
A street maintenance engineer in Davenport Kansas made a few investments in capital equipment and Davenport can now do street projects twice as fast a...
Views: 248, Comments: 12
Last comment 07/28/2015 by Kevin LaPaire
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Commercial Space

1866 threads, 3509 comments (1 Viewing)

CAD Drafting, 3D Rendering and Architectural Visualization Outsourcing

07/24/2015 by julaos
The Architecture outsourcing services company provides high-quality architectural and design services at affordable prices. Architecture Outsourcing...
Pathfinder Tags: 3d rendering architecture architecture outsourcing CAD drafting
Views: 12, Comments: 0

3D walkthrough animations for architecture - Yantram Studio

07/23/2015 by yantramstudio
We at Yantram Studio Developed 3D Walk through Animations for a variety of Architectural Projects and Having Good Expertise in Architectural 3D Anim...
Views: 29, Comments: 1
Last comment 07/23/2015 by Original_Macgyver

How Fit Do You Need To Be For Rig Welding ?

07/17/2015 by Rubin
Hi, I am a welder with 9 years of experience with a construction company. I recently upgrade my welding qualification to (http://www.weldtechtraining....
Views: 109, Comments: 6
Last comment 07/17/2015 by phoenix911

Industrial Valve Design Services

07/09/2015 by kirants97
We provide the following services to Global Industrial Valve Manufacturers - * Value Engineering - Design / Weight Optimization * New Product Desig...
Pathfinder Tags: LCTJGY6P
Views: 66, Comments: 0

Zirconia Ceramic Components

07/09/2015 by michaelzhuo
Zirconia ceramics materials provide excellent erosion, corrosion and abrasion resistance along with temperature resistance, fracture toughness and str...
Pathfinder Tags: Zirconia Ceramic components
Views: 52, Comments: 0
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CR4 Feedback

635 threads, 11289 comments (2 Viewing)

How To Unregister

07/28/2015 by Anonymous Poster
Dear Members/Admin, Good Day. I want to know how to unregister to this site.
Views: 60, Comments: 5
Last comment 07/28/2015 by Mikerho

Improvement in CR4

07/26/2015 by dhayanandhan
To: CR4 Admn. About 6 weeks back there was a message to CR4 Members to suggest improvements and strengthen the CR4 Forum. There were many suggestions...
Views: 90, Comments: 9
Last comment 07/27/2015 by dhayanandhan

Jibberish Postings

07/13/2015 by DownEasta
I have recently updated my email address for this CR4 forum. I'm disturbed that the daily email suggested three postings in Chemical and Material Scie...
Pathfinder Tags: jibberish nonsence spam
Views: 152, Comments: 6
Last comment 07/14/2015 by Fredski

What Has Gone Wrong with CR4?

07/12/2015 by xyz
The administrators need to do something to remove all kinds of discussions on so many posting related to male enhancement drug etc. This is an enginee...
Views: 149, Comments: 14
Last comment 07/12/2015 by lyn

Who Is Online Link Not Working

06/28/2015 by IdeaSmith
The "Who is online" link not working. Hope this will be fixed soon.
Views: 161, Comments: 2
Last comment 06/29/2015 by IdeaSmith
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Section Blogs

Notes & Lines

22 blog entries, 140 comments (0 Viewing)

Creative AI: Can Computers Create?

07/28/2015 by Jonathan Fuller
Artificially intelligent systems are capable of many human-like behaviors. At least on a surface-level, they can think, learn, speak, read, and simu...
Pathfinder Tags: aaron artificial intelligence creative ai
Views: 8, Comments: 1
Last comment 07/28/2015 by Rixter

Your Kitchen Table Is Now A Musical Instrument

06/25/2015 by Jonathan Fuller
Pocket-sized instruments have always appealed to musicians. Pulling out a harmonica, xaphoon, or ocarina and playing on the go seems like the pinna...
Pathfinder Tags: electronic music tonetree
Views: 282, Comments: 5
Last comment 06/30/2015 by IanR

RIP Grooveshark

05/11/2015 by Jonathan Fuller
Many people of a certain age (mine, specifically) will likely tell tales about the brief Golden Age of Napster to their children and grandchildren....
Pathfinder Tags: dcma digital copyright grooveshark P2P
Views: 202, Comments: 2
Last comment 05/13/2015 by tcmtech
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Roger's Equations

141 blog entries, 1604 comments (1 Viewing)

Weyl Fermions

07/27/2015 by Roger Pink
I came across this article and thought I would pass it along. It's a great breakthrough, with powerful implications for computing. - Weyl f...
Views: 82, Comments: 2
Last comment 07/27/2015 by Mikerho

Pluto Flyby - New Horizons Just Finished Closest Approach

07/14/2015 by Roger Pink
Leaving Pluto - An Hour After Closest Encounter After 3462 days in space, New Horizons has finally reached its closest approach to Pluto! Roughly a...
Views: 271, Comments: 11
Last comment 07/19/2015 by Roger Pink


07/13/2015 by Roger Pink
Memory and Processing The human brain both stores and processes information at the same time as opposed to conventional computers which store informa...
Views: 159, Comments: 7
Last comment 07/14/2015 by Rixter
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What Is It?

67 blog entries, 1840 comments (4 Viewing)

What is It? for July 26

07/26/2015 What is it? Share your guess in the comments below! Thanks to CR4 member Nigh for sharing this image.
Views: 390, Comments: 24
Last comment 07/28/2015 by Wal

What is It? for July 19

07/19/2015 What is it? Share your guess in the comments below! Thanks to CR4 member SolarEagle for sharing this image.
Pathfinder Tags: what is it
Views: 520, Comments: 36
Last comment 07/27/2015 by simonsd

What is It? for July 12

07/12/2015 What is it? Share your guess in the comments below! Thanks to CR4 member Dan A for sharing this image.
Pathfinder Tags: what is it
Views: 528, Comments: 36
Last comment 07/14/2015 by phoenix911
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Caption This!

317 blog entries, 13762 comments (0 Viewing)

Caption this for 07/24/15

07/23/2015 by LakeGrl
This weeks image: Be sure to vote for your favorite caption! Thanks to Nigh for submitting this image.
Pathfinder Tags: birds dump ducks engineering engineering images funny images
Views: 524, Comments: 59
Last comment 07/27/2015 by PWSlack

Caption this for 07/17/15

07/16/2015 by LakeGrl
This week's image: Be sure to vote for your favorite caption! Thanks to Nigh for submitting this image.
Pathfinder Tags: engineering engineering images funny images photography
Views: 626, Comments: 49
Last comment 07/22/2015 by szwasta

Caption this for 07/10/15

07/09/2015 by LakeGrl
This week's image: Be sure to vote for your favorite caption! Thanks to Nigh for submitting this image.
Pathfinder Tags: engineering engineering images funny images
Views: 572, Comments: 58
Last comment 07/17/2015 by RG2
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Defense & Security Technology

88 blog entries, 1412 comments (0 Viewing)

China Flexes Military Muscles Near Taiwan

07/19/2015 by IHS Engineering360 eNewsletter
From May into June, China conducted military exercises to project power around Taiwan. These events coincided with the visit of the head of the is...
Views: 247, Comments: 17
Last comment 07/22/2015 by texasron

F-35 Block Buy Could Cut Costs

06/28/2015 by IHS Engineering360 eNewsletter
Buying up to 450 F-35s in a three-year block buy could yield "double-digit" cost savings, according to Frank Kendall, U.S. undersecretary of defense f...
Views: 250, Comments: 21
Last comment 07/01/2015 by phoenix911

Tonight There's Gonna Be A Jailbreak

06/17/2015 by HUSH
By now you've probably heard the truth-is-stranger-than-fiction story of the prison escape in upstate New York. Presumably like many other non-jaile...
Pathfinder Tags: design escape prison tunnel
Views: 333, Comments: 5
Last comment 06/27/2015 by Wal
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Animal Science

216 blog entries, 1972 comments (0 Viewing)

The Summer of the Shark

07/15/2015 by HUSH
It's that time of the year where people are more interested in getting out of their office or home and to the pool. Or if you live in a coastal area...
Pathfinder Tags: beach protection shark technology
Views: 194, Comments: 0

Analysis of a Champion: American Pharoah

06/09/2015 by SavvyExacta
American Pharoah has won the Triple Crown! This headline has been shouted at us since he became the first horse in 37 years to accomplish the feat....
Pathfinder Tags: horse racing
Views: 198, Comments: 5
Last comment 06/09/2015 by JBTardis

Brontosaurus vs Apatosaurus

04/24/2015 by Chelsey H
When I was little one of my favorite movies was "We're Back: A Dinosaur Story". It's a ridiculous cartoon about dinosaurs showing up in a big city....
Views: 269, Comments: 1
Last comment 04/24/2015 by SavvyExacta
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The CR4 Admin Blog

77 blog entries, 1317 comments (0 Viewing)

Sponsored Blog Posts on CR4

07/10/2015 As I mentioned a while back, sponsored posts will soon appear on CR4. The first one will be launched on Sunday July 12. When launching this opportuni...
Views: 210, Comments: 8
Last comment 07/13/2015 by KB0RAE

What Do You Want to Read About?

05/21/2015 IHS will soon be featuring sponsored blog posts from suppliers on CR4. Don't worry! CR4 won't be overrun with sponsored content. There will be a max...
Views: 249, Comments: 15
Last comment 05/25/2015 by Yahlasit

The Homework Question Debate

04/22/2015 We've all seen them... posts that are obviously homework questions copied directly from students' textbooks. It's understandable that nobody should ge...
Views: 517, Comments: 46
Last comment 05/01/2015 by James Stewart
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The Engineer's Notebook

340 blog entries, 5442 comments (0 Viewing)

2038: Y2K 2.0?

07/06/2015 by Jonathan Fuller
Who could forget Y2K? I have fond memories of counting down to midnight on January 1, 2000 prepared to witness planes fall from the sky and neighbor...
Pathfinder Tags: 2038 problem date bug Y2K
Views: 600, Comments: 2
Last comment 07/08/2015 by Kaplin

Speaking of Social Robots...

06/18/2015 by Jonathan Fuller
The fact that we humans have a predilection for sociable robots is pretty well mirrored in our science fiction creations. Rosie's smart-aleck commen...
Pathfinder Tags: paro pepper social robots therapy robots
Views: 219, Comments: 4
Last comment 06/27/2015 by Wal

The Hyperloop Lives

06/09/2015 by HUSH
If you ever compose a blog for CR4, prepare to be told you're wrong. It has happened to me dozens of times and it's somewhat of an 'earned stripe.'...
Pathfinder Tags: atmospheric railway Elon Musk future hyperloop
Views: 260, Comments: 6
Last comment 06/11/2015 by Rixter
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Challenge Questions

329 blog entries, 27628 comments (8 Viewing)

Apollo 11 Communications Log- Gimbal Lock: Newsletter Challenge (July 2015)

07/01/2015 This month's Challenge Question: Specs & Techs from IHS Engineering360: CapCom - "Columbia, Houston. We noticed you are maneuvering very close t...
Pathfinder Tags: challenge questions NASA
Views: 2234, Comments: 11
Last comment 07/21/2015 by Halsey

Airbag Physics: Newsletter Challenge (June 2015)

06/01/2015 This month's Challenge Question: Specs & Techs from IHS Engineering360: This month we had the largest automotive recall in U.S. history: 33.8 mi...
Pathfinder Tags: challenge question
Views: 1861, Comments: 27
Last comment 06/06/2015 by WilhelmHKoen

Styrofoam Slide (May 2015)

05/01/2015 This month's Challenge Question: Specs & Techs from IHS Engineering360: Try this experiment: slide a Styrofoam cup full of water across a smooth...
Pathfinder Tags: challenge question
Views: 2025, Comments: 49
Last comment 06/27/2015 by WilhelmHKoen
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Relativity and Cosmology

145 blog entries, 3757 comments (0 Viewing)

How Zeons turned into something Useful

06/30/2015 by Jorrie
In the last Blog, How Aeons turned into Zeons, we derived a very simple formula for the expansion dynamics of the cosmos: (5) H^2 = 1 + 0.443 S^3 wh...
Views: 198, Comments: 0

How Aeons turned into Zeons

05/12/2015 by Jorrie
Quite a lot has been written on this CR4 Blog about the standard Lambda-Cold-Dark Matter (LCDM) cosmological model and its equations. Arguably the...
Pathfinder Tags: cosmological constant cosmology expansion
Views: 245, Comments: 0

HTRN's Cosmology Questions

01/17/2015 by Jorrie
in HTRN's thread about the rate of bubble rise and expansion in a fluid, he also saw analogies to cosmological expansion and he speculated: "Maybe we...
Pathfinder Tags: cosmological constant cosmology expansion
Views: 367, Comments: 16
Last comment 02/10/2015 by HiTekRedNek
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Editor's Desk

12 blog entries, 65 comments (0 Viewing)

A Cultural Icon Turns 35

05/19/2015 by wagman262
Our infographic for the week of 18 May looks at the impact of Pac-Man on video games 35 years after its release in Japan. From an engineering design p...
Views: 161, Comments: 0

Hardening the Energy Coast

04/30/2015 by wagman262
As part of our ongoing look at risk mitigation and engineering, Engineering360 published this terrific article that examines infrastructure hardening...
Views: 129, Comments: 2
Last comment 04/30/2015 by SavvyExacta

Moore's Law at 50

04/16/2015 by wagman262
Bill Schweber, one of our contributing editors, has a terrific piece on the 50th anniversary of Moore's Law. Have a look at it here and let me know wh...
Views: 275, Comments: 10
Last comment 04/23/2015 by Wal
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62 blog entries, 525 comments (0 Viewing)

Big Bets Lost on Vegas Hotel

04/23/2015 by HUSH
If you're in Las Vegas, you're probably going to gamble. The city is well known for its attractions, from the resorts to the shopping to the shows t...
Pathfinder Tags: architecture las vegas structural engineering
Views: 347, Comments: 2
Last comment 04/25/2015 by Rixter

Safety Concerns of Oil by Rail

10/30/2014 by cheme_wordsmithy
Historically, most oil in the U.S. has been transported via pipeline. In 2008, the U.S. saw the rise of a new alternative for crude oil shipment - rai...
Views: 455, Comments: 19
Last comment 02/23/2015 by machia0705
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Rockaholic Adventures

45 blog entries, 573 comments (0 Viewing)

Independent Party on Disappointment Cleaver – Part II

02/17/2015 by Shawn
The historic ratio of independent parties to guided ascents of Mt. Rainier holds steady at roughly 45% to 55%. In search of a true sense of accompl...
Pathfinder Tags: Disappointment Cleaver Mt. Rainier
Views: 218, Comments: 0

Independent Party on Disappointment Cleaver - Part I

02/06/2015 by Shawn
Mt. Rainier via Disappointment Cleaver is a formidable expedition on glaciated terrain for novice mountaineers. It is a challenging class III climb...
Pathfinder Tags: Disappointment Cleaver Mt. Rainier
Views: 149, Comments: 2
Last comment 02/09/2015 by Shawn

Are Energized Fluids the Economic Alternative?

10/03/2014 by Shawn
Suppliers, researchers, and service companies working in unconventional oil and natural gas plays look to displace large volumes of hydraulic fract...
Pathfinder Tags: energized fluids energized foams energized fracture treatments
Views: 320, Comments: 0
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The Standard

4 blog entries, 13 comments (0 Viewing)

New ISO Energy Management Standard Released

11/18/2014 by KevinCassidy
The International Organization for Standardization (ISO) has released the new ISO 50003:2014 Energy management systems - Requirements for bodies provi...
Pathfinder Tags: ANSI audit certification Energy energy standards ...
Views: 285, Comments: 0

Follow up: Women's Lacrosse Headgear Standard Set for Second Ballot

11/13/2014 by KevinCassidy
I wrote about the debate between the Florida High School Athletic Association and US Lacrosse over the use of helmets during high school girls lacross...
Pathfinder Tags: ANSI ASTM eye protection face florida ...
Views: 144, Comments: 1
Last comment 01/28/2015 by sporteyes

Don't Forget to "Look Before You Pump"

11/05/2014 by KevinCassidy
The Outdoor Power Equipment Institute (OPEI) has been active in educating consumers about the variety of fuels available at the pump, and how to ident...
Pathfinder Tags: ANSI automotive E10 E15 equipment ...
Views: 243, Comments: 8
Last comment 11/08/2014 by tcmtech
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Physics In Film

9 blog entries, 85 comments (0 Viewing)

Medieval Physics - Siege Engines

09/03/2014 by cheme_wordsmithy
I don't think a blog series titled Medieval Physics would be complete without a discussion of siege engines. Siege engines were the machines that made...
Views: 722, Comments: 10
Last comment 09/09/2014 by SavvyExacta

Medieval Physics - Jousting

08/26/2014 by cheme_wordsmithy
In a previous blog entry I gave a short summary of the physics and history of the bow and arrow (thanks to all you CR4 users who shared your insight a...
Views: 481, Comments: 8
Last comment 08/29/2014 by phoenix911

Medieval Physics - Bows & Arrows

08/12/2014 by cheme_wordsmithy
Of the many interesting events that take place in the summer, one of my favorites are Renaissance fairs. Seeing the participants in character and cost...
Views: 627, Comments: 15
Last comment 08/13/2014 by suresh sharma
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Other Blog Entries of Interest

Scrap Metal Wire Stripper

12/12/2014 posted in Workbench Creations
by frankd20
I have been working on a lot of building projects, with not much time for anything else these last few years. As part of these projects, I ended up...
Pathfinder Tags: copper wire recycling wire stripper
Views: 472, Comments: 8
Last comment 12/18/2014 by C-Mac

Slo' Mo' Hat Cam

07/04/2014 posted in Workbench Creations
by Del the cat
I wanted to see how my arrows were flying from my bow, specifically flight arrows. A flight arrow presents a conundrum, you'd think you would want...
Views: 864, Comments: 67
Last comment 07/15/2014 by europium mkII

Whistling Walnut!

12/28/2013 posted in Workbench Creations
by Del the cat
What to do with the walnut shells left over from Christmas? Make a whistling arrow . I'd been toying with the idea for ages, and if you try an...
Views: 963, Comments: 33
Last comment 01/02/2014 by artsmith

Detective Work On An Exploded Warbow

07/11/2013 posted in Workbench Creations
by Del the cat
It's often impossible to actually work out how and why a bow explodes. But this time I think I know! I was building a copy of a Mary Rose Warb...
Views: 1033, Comments: 13
Last comment 07/14/2013 by lyn

Del's Lathe Refurb' pt 3

06/20/2013 posted in Workbench Creations
by Del the cat
I've done the back gears, I could have bought new gears, but I thought I'd 'make do and mend'. I replaced the small cog with a slightly larger one...
Views: 786, Comments: 16
Last comment 06/22/2013 by Del the cat

Del's Lathe Refurb' pt 2

06/10/2013 posted in Workbench Creations
by Del the cat
The lathe came without any change wheels or the bracket to attach them, and one of the odd things about the lathe is the lead screw runs back to front...
Views: 619, Comments: 11
Last comment 06/25/2015 by Del the cat