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09/15/2014 7:19 AM

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General Discussion

13298 threads, 233551 comments (33 Viewing)

Reg: Leather

09/18/2014 by ragavan
Can somebody tell what will be the cost difference between Top leather and Split Leather.A rough difference in % is also ok. This is for Automotive P...
Pathfinder Tags: leather
Views: 11, Comments: 1
Last comment 09/18/2014 by Crabtree

Space Contracts

09/17/2014 by Fredski
Views: 34, Comments: 0

Optical Illusion or Not

09/17/2014 by netmaker
Line A. is supposed to be 5'. Line B is supposed to be 5. 'Line C. is 12'. Customer says that A and B are both 5' and this picture is just an opt...
Views: 184, Comments: 20
Last comment 09/18/2014 by phoenix911

Finding TDC on a SBC...But Think Out of the Box!

09/17/2014 by SSCpal
I have a SBC in my hot rod. A Potvin blower attaches to the front of the motor and therefore there is no damper or timing marks. I know I can pull a h...
Pathfinder Tags: sbc tdc timing
Views: 73, Comments: 13
Last comment 09/18/2014 by Tom_Consulting

442 Million Miles Later

09/17/2014 by Fredski Mars we're back
Views: 69, Comments: 4
Last comment 09/17/2014 by North of 60
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Commercial Space

1795 threads, 3293 comments (0 Viewing)

Physical and Chemical Properties Dipeptide Diaminobutyroyl Benzylamide Diacetate

09/18/2014 by dfbb
Dipeptide Diaminobutyroyl Benzylamide Diacetate, belongs to, containing amino groups, which belongs for the raw material goods. The existing component...
Views: 12, Comments: 1
Last comment 09/18/2014 by IdeaSmith

Planning Your Trip Today!

09/12/2014 by spfence
Are you still in the middle of hesitation travelling abroad? Erase all your worries because Cheap holidays in UK can provide solutions and will certai...
Views: 6, Comments: 0

How to Convert MBOX to PST files?

09/12/2014 by gibbsmarcel
I am going to discuss here about an excellent MBOX to PST Conversion application, which is well known as Kernel for MBOX to PST Converter. By using th...
Pathfinder Tags: mabox to pst
Views: 9, Comments: 0

Composite Manhole Cover and Gratings Manufacturer and Exporter

09/11/2014 by Phoebe Liu
Dear Sir/Madam, Our company excels in providing complete composite manhole cover and gratings for more than 10 years. Patented design features and ad...
Pathfinder Tags: manhole cover
Views: 5, Comments: 0

Structural Engineering Services

09/08/2014 by skill
Steel construction detailing is provide engineering services of Structural Steel and structural engineering and structural steel detailing service. -...
Pathfinder Tags: Structural Engineering service Structural Steel design Structural Steel Detail
Views: 47, Comments: 3
Last comment 09/08/2014 by PWSlack
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CR4 Feedback

586 threads, 10437 comments (0 Viewing)

Not Getting CR4 Email Notifications

09/14/2014 by roy hammy
I am not sure what went wrong but I would like to get hold of CR4 and get back on the email list. How to do this as my search of the site seemed in va...
Views: 36, Comments: 3
Last comment 09/14/2014 by SolarEagle

News Letter

09/07/2014 by harry j french
how to get rid of your news letter?
Pathfinder Tags: news letter
Views: 84, Comments: 4
Last comment 09/08/2014 by SavvyExacta

How "Guru" Was Chosen

09/04/2014 by dhayanandhan
If we read the Ancient and Modern History, GREEK and LATIN WERE PREDOMINANT and many Scientific Words are based on the Greek Latin language/signs. If...
Views: 359, Comments: 16
Last comment 09/08/2014 by SavvyExacta

Troll At Work, Again

08/30/2014 by lyn
The Troll is on a vendetta, again. Enjoy yourself, and don't worry. Easy come, easy go. I hope the effort is worth it.
Views: 389, Comments: 5
Last comment 09/01/2014 by LOCKDUKE

Posting - Whether Accounted or Not Accounted

08/24/2014 by dhayanandhan
Dear CR4 Admn/ Dear CR4 Members, In the past few days, I have replied more than 12 topics, but the UP-DATED DISCUSSIONS remain at 589, AND DOES NOT C...
Views: 135, Comments: 12
Last comment 08/25/2014 by JohnDG
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Section Blogs

Caption This!

274 blog entries, 11853 comments (0 Viewing)

Caption This for 09/12/14

09/11/2014 by Kaplin
This week's image: Be sure to vote for your favorite caption!
Pathfinder Tags: Caption this cell phone engineering images funny images
Views: 500, Comments: 34
Last comment 09/14/2014 by metalSmiths

Caption This for 09/05/14

09/04/2014 by Kaplin
This week's image: Be sure to vote for your favorite caption!
Pathfinder Tags: Caption this engineering images funny images rollercoaster
Views: 611, Comments: 37
Last comment 09/13/2014 by CaptMoosie

Caption This for 08/29/14

08/28/2014 by Kaplin
This week's image: Be sure to vote for your favorite caption! Thanks to JPool for submitting this image.
Pathfinder Tags: Caption this engineering images funny images
Views: 609, Comments: 33
Last comment 09/04/2014 by Munster
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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: 306, 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: 273, 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: 423, Comments: 15
Last comment 08/13/2014 by suresh sharma
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The CR4 Admin Blog

65 blog entries, 1033 comments (0 Viewing)

CR4 and IHS Engineering360: New Online Destination for Engineers

09/02/2014 After 10 years of strategic planning and acquisitions, IHS Engineering360 will be released in September. Upon launch, this will become the largest onl...
Views: 314, Comments: 5
Last comment 09/03/2014 by suresh sharma

Why You May Have Fewer Posts & GAs

07/08/2014 by SavvyExacta
The team has been cleaning up CR4 a little bit. Your post and good answer totals may be lower because posts and comments from deleted threads are no l...
Views: 465, Comments: 26
Last comment 07/15/2014 by Kris

Posting Timeouts--Fixed?!

02/13/2014 As far as I can tell, the reason for the timeouts experienced by users trying to post to CR4 has been fixed. (Don't know what I'm talking about? Click...
Views: 469, Comments: 24
Last comment 02/20/2014 by adreasler
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Challenge Questions

319 blog entries, 27300 comments (1 Viewing)

Balloon Ride: Newsletter Challenge (September 2014)

09/01/2014 This month's Challenge Question: Specs & Techs from GlobalSpec: You are inside a car with the windows closed, and you are holding a helium ballo...
Pathfinder Tags: challenge question
Views: 2571, Comments: 37
Last comment 09/14/2014 by joegim

The Sprinkler Mystery: Newsletter Challenge (August 2014)

08/01/2014 This month's Challenge Question: Specs & Techs from GlobalSpec: An old home's new sprinklers are scheduled to start up at 9 PM but do not. A tec...
Pathfinder Tags: challenge question
Views: 4493, Comments: 144
Last comment 09/04/2014 by JE in Chicago

Space Trail: Newsletter Challenge (July 2014)

06/30/2014 This month's Challenge Question: Specs & Techs from GlobalSpec: The path that a spacecraft follows when traveling to the moon is a distorted fig...
Pathfinder Tags: challenge question
Views: 2740, Comments: 21
Last comment 08/10/2014 by WilhelmHKoen
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Defense & Security Technology

76 blog entries, 1166 comments (0 Viewing)

China's Hong Kong Listening Post Revealed

08/24/2014 by IHS GlobalSpec eNewsletter
The purpose of a geodesic dome atop Hong Kong's highest mountain was unveiled recently in IHS Jane's Defence Weekly. The facility has been operating...
Views: 382, Comments: 8
Last comment 08/25/2014 by Unredundant

Sea Drone is Solar Powered

07/03/2014 by IHS GlobalSpec eNewsletter
Eco Marine Power's Aquarius USV (unmanned surface vessel) will be a trimaran covered with "marine grade" solar cells to charge its Li-ion batter...
Views: 343, Comments: 7
Last comment 07/08/2014 by europium mkII

Engineers Save the World--June 6, 1944

06/04/2014 by HUSH
Friday marks the 70^th anniversary of D-Day, June 6, 1944. It would be thoughtless to not mention the bravery of the American (and British and Canad...
Pathfinder Tags: D-Day June 5 military engineering WWII
Views: 520, Comments: 4
Last comment 06/05/2014 by passingtongreen
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The Engineer's Notebook

324 blog entries, 5342 comments (0 Viewing)

Engineering Degree? Your 'Get Out of Jury Duty Free' Card

08/20/2014 by HUSH
Jury duty is often described as a consequence of citizenship. "It's a civic duty!" and "Give back to your community!" are two of the more guilt-lace...
Pathfinder Tags: career engineer jury duty
Views: 536, Comments: 42
Last comment 08/26/2014 by adreasler

Life is Random

07/30/2014 by HUSH
I'm sure that by now you've heard yet another Jurassic Park film will be released next year. This time around the dinosaurs run amok and eat people,...
Pathfinder Tags: dinosaur extinction life Mars
Views: 382, Comments: 14
Last comment 08/04/2014 by europium mkII

Build a Better Fourth

07/02/2014 by HUSH
I may or may not have mentioned this before, but the Fourth of July is awesome. It's an unusual holiday here in the U.S., as it's our only federal h...
Pathfinder Tags: fireworks holiday July 4
Views: 362, Comments: 0
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Notes & Lines

18 blog entries, 116 comments (0 Viewing)

Acoustic Guitar Tonewoods

07/26/2014 by cheme_wordsmithy
I remember the day I received my acoustic guitar, and played it for the first time. In the moment, it seemed produced the most beautiful sound I had e...
Views: 306, Comments: 14
Last comment 08/06/2014 by Holzfeller

For Love of the Index

05/09/2014 by Hannes
If you're a literate human who's a (diligent) knowledge worker or (diligent) student, chances are you've used an index this week. Or at least you di...
Pathfinder Tags: books index indexing
Views: 230, Comments: 0

Wait...What'd I Just Say?

03/27/2014 by Hannes
Several months ago, an acquaintance decided to try out a speech recognition software program to cure writer's block. He found it to be quite "inte...
Pathfinder Tags: ambiguity natural language processing nlp words
Views: 668, Comments: 8
Last comment 04/02/2014 by Calnet42
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TechnoTourist’s Engineering Expeditions

80 blog entries, 461 comments (0 Viewing)

Vacation Destinations for Engineers

07/17/2014 by SavvyExacta
What are your summer vacation plans? TechnoTourist has compiled a list of some destinations of engineering interest that have been featured on the b...
Views: 368, Comments: 11
Last comment 07/22/2014 by SavvyExacta

Castell de Bellver - Mallorca Spain's Circular Castle

11/02/2013 by SavvyExacta
Bellver Castle, or Castell de Bellver, is located in Palma de Mallorca and dates back to the 14^th century. This particular castle is unique because...
Views: 496, Comments: 0

Barcelona and the Influence of Antoni Gaudí' (Park Güell, Sagrada Familia)

10/11/2013 by SavvyExacta
My travels brought me to Spain a few weeks ago. Barcelona is a port city that was revived by hosting the 1992 Summer Olympic Games. But 100 years befo...
Pathfinder Tags: Gaudi Park Guell Sagrada Familia
Views: 444, Comments: 1
Last comment 10/11/2013 by PWSlack
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Animal Science

210 blog entries, 1914 comments (0 Viewing)

Ways to Care for Your Aging Cat

06/16/2014 by SwissMiss
One of my most cherished memories is the day I adopted my first cat. My younger self was delighted to have a new friend, and as we grew together ove...
Views: 493, Comments: 8
Last comment 06/20/2014 by SwissMiss

Jeepers, Creepers... a Different Kind of Peepers!

05/01/2014 by SavvyExacta
The birds are singing, the grass is greening, and the peepers are peeping. Spring has finally sprung here in upstate New York after a long, long win...
Pathfinder Tags: ANIMAL SCIENCE frogs hibernation peepers
Views: 426, Comments: 5
Last comment 05/02/2014 by lyn

Would You Do Anything for Love? Cardinals Will!

02/14/2014 by SavvyExacta
As you enjoy your morning coffee you gaze out the window and watch the birds at the feeder. But what's going on in the distance - is something attac...
Pathfinder Tags: bird behavior
Views: 640, Comments: 6
Last comment 02/19/2014 by Doggoneit
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The Standard

1 blog entries, 3 comments (0 Viewing)

Safety News:The Helmet Debate in Girls Lacrosse

06/12/2014 by KevinCassidy
Recently, the Florida High School Athletic Association (FHSAA) voted to require the use of helmets by high school girls lacrosse players in Florida st...
Pathfinder Tags: ANSI ASTM Head Protection helmet Lacrosse ...
Views: 175, Comments: 3
Last comment 06/17/2014 by phoenix911
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WoW Blog (Woman of the Week)

159 blog entries, 452 comments (0 Viewing)

Women Redefining Leadership in STEM and IT

05/10/2014 by Chelsey H
As of 2014, there is still a lack of female representation in science, technology, engineering, and mathematics. Women hold just about 32 percent of...
Views: 353, Comments: 3
Last comment 05/11/2014 by europium mkII

Top 10 Women Engineers and Scientists

10/18/2013 by CR4 Guest Author
Many women have made great contributions to science and engineering. Check out the list of the 10 below and read their biographies. Then, let us know:...
Views: 649, Comments: 8
Last comment 11/20/2013 by Tornado
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Roger's Equations

88 blog entries, 1119 comments (0 Viewing)

Why LiFi? by Roger Pink

05/08/2014 by Roger Pink
The Coming Data Crunch Everywhere you look nowadays, the world is becoming more mobile. Smart phone...
Views: 473, Comments: 2
Last comment 05/09/2014 by Rixter

New Dwarf Planet And Other Solar System News by Roger Pink

03/26/2014 by Roger Pink
- New Dwarf Planet Discovered - Astronomers have increased the size of the observable solar system after spotting a 450-km wide object orbiting the...
Views: 488, Comments: 7
Last comment 05/01/2014 by europium mkII

Oceans by Roger Pink

03/20/2014 by Roger Pink
The Great Unknown...Right Next To Us Although oceans and other bodies of water cover 70% of the Earth's surface, we are only just now beginning...
Views: 446, Comments: 6
Last comment 03/21/2014 by SolarEagle
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60 blog entries, 498 comments (0 Viewing)

Dangerous Drilling - Oil & Gas Rig Safety

03/06/2014 by cheme_wordsmithy
Crude oil and natural gas have over the last hundred plus years become critical to our way of life and economy. Not only do they satisfy a huge chun...
Views: 452, Comments: 2
Last comment 03/06/2014 by texasron

Titanic Sank Over A Century Ago, But The Story Lives On - 5 Possible Reasons Why Is It So Interesting Even Today!

10/13/2013 by CR4 Guest Author
On April 10, 1912, Titanic, the virtually unsinkable ship, embarked on its maiden voyage to never return again. It hit an iceberg deep in the night...
Views: 666, Comments: 27
Last comment 10/15/2013 by Yusef1
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What Is It?

60 blog entries, 1628 comments (0 Viewing)

What Is It? for 2/28/2014

02/28/2014 What is this stuff?
Views: 809, Comments: 30
Last comment 03/18/2014 by RufusVS

What Is It? for 2/22/2014

02/22/2014 What is this item? Two views are shown. Share your guesses below!
Pathfinder Tags: What is it?
Views: 946, Comments: 71
Last comment 03/02/2014 by Andy Germany

What Is It? for 2/15/2014

02/15/2014 What is this? Bonus points if you can guess where it is, too!
Pathfinder Tags: What is it?
Views: 826, Comments: 19
Last comment 03/06/2014 by steven phaneuf
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Great Engineers & Scientists

144 blog entries, 498 comments (0 Viewing)

U.S. Presidents Who Were Engineers

02/16/2014 by SavvyExacta
Monday is Presidents' Day in the USA. In honor of Washington and all other presidents we will take a look at those who contributed something to engi...
Views: 710, Comments: 18
Last comment 02/21/2014 by suresh sharma

Top 10 Greatest Engineers

09/20/2013 by CR4 Guest Author
Who are the greatest engineers of all time? Here's a list of 10. Click on the links to see their biographies. Then tell us: who's on your top 10 list?...
Views: 1006, Comments: 36
Last comment 09/30/2013 by passingtongreen
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"On This Day" In Engineering History

232 blog entries, 817 comments (0 Viewing)

October 31, 1941 – The Completion of Mount Rushmore

10/31/2013 by cheme_wordsmithy
One of the fondest memories I have from my "Out West" trip 6 years ago was arriving at the Mount Rushmore National Memorial in South Dakota. Though I...
Pathfinder Tags: monuments Mount Rushmore October 31
Views: 820, Comments: 6
Last comment 11/02/2013 by ronseto
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Other Blog Entries of Interest

Do We Live In a White Hole?

08/28/2014 posted in Relativity and Cosmology
by Jorrie
At the event horizon radius of a normal black hole (BH), things 'fall in' at the local speed of light, or more subtly said, "space itself falls in...
Pathfinder Tags: black hole White hole
Views: 374, Comments: 28
Last comment 09/03/2014 by Jorrie

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: 667, Comments: 67
Last comment 07/15/2014 by europium mkII

The Poisson Distribution by Roger Pink

02/26/2014 posted in Derivations
by Roger Pink
The Poisson distribution, named for Simeon Denis Poisson, is a discrete probability distribution that expresses the probability of a given number...
Views: 373, Comments: 0

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: 761, 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: 875, 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: 647, Comments: 16
Last comment 06/22/2013 by Del the cat