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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, 04 Dec 2016 05:00:00 EST

Copyright: Copyright 2016

IEC Symbol Meaning

Sat, 03 Dec 2016 18:30:05 EST

What is this symbol across the voltage transformer secondary?

Harmonics & Mitigation, Power Factor, Damage from Harmonics and Power Costs

Sat, 03 Dec 2016 07:36:41 EST

Hi Guys Harmonics & Mitigation, power factor, damage from harmonics and power costs Yes the title is a mouth full, however I'm not looking for explanations on any of the above mentioned items, only links to white papers, web sites etc, that might explain in simpler terms either all of the abov

Hawaiian Snow Storm

Sat, 03 Dec 2016 00:51:55 EST

what global warming?? the 50th expecting up to a foot of the white stuff.

1997 HAAS VF-2 Mill Will Not Drip Feed Large Files

Fri, 02 Dec 2016 23:01:59 EST

We are having problems running the DNC mode drip feed from our Shop Floor Automations unit. This unit sends data from USB thru Ethernet to the RS 232 port in the HAAS. We have verified that the interface between the unit and the controller is communicating. We have run smaller files in drip feed an

Mineral Wool Insulated Commercial Garage Doors

Fri, 02 Dec 2016 21:17:31 EST

Good afternoon!!! Need to find a manufacturer of mineral wool insulated commercial garage doors. Advice would be greatly appreciated. Thanks. RVela

Seasonal Group Participation

Fri, 02 Dec 2016 15:08:44 EST

Inspired by "Twas the Night Before Christmas" by Clement Clarke Moore. There is no way this could possibly match the literary genius of the cast iron bathtub thread but it is Friday and we are about to be overwhelmed by offers for health products and other spam postings. In the spirit of totally wo

Custom Lighting with Fiber Optics?

Fri, 02 Dec 2016 01:04:24 EST

Building custom furniture for a library & media room and have to create some unique focused lighting for reading... yes books! Was trying to decide which material to use and came across this article. Glass vs Plastic in fiber optics applications. The project is high end for a very particular cus

Timer Circuit for Poultry

Thu, 01 Dec 2016 17:09:35 EST

It is necessary to make a timer circuit so that it can lit few dozen CF lamps (in total 500 watts) at 04:00 hrs. and put them off at 06:30 hrs. or 07:00 hrs. (depending season of the year). In the evening it again should put them on at 05:00 or 06:30 hrs. and put them off at 08:00 hrs. Doing so, ins

Segway Turns 15

Thu, 01 Dec 2016 15:02:08 EST

The Segway PT scooter debuted on live TV 15 years ago this week. I remember the announcement being hyped beyond belief, with none other than Steve Jobs claiming it would be as big a deal as the PC and the internet. Being a naive teenager I was expecting a truly life-changing invention--I thought it

Open Loop Poles That Are Not There?

Wed, 30 Nov 2016 20:38:42 EST

I have a simple open loop transfer function of a system. It comes from an example problem in the Ogata Controls books on page 343 Example 6.10 The book tells us we have an open loop transfer function of the following Obviously there is an unknown variable k in the transfer function The examp

Tech Takes the Wheel

Sun, 04 Dec 2016 05:00:00 EST

Bosch's VisionX concept involves platoons of "super trucks" electronically linked to a lead vehicle. As they travel down the highway, trucks in the platoon steer, accelerate, and brake in sync. Drivers, however, would control the trucks before and after they join a platoon. ------- Editor's Note

Lidar Gives Armor Crews Model of Surroundings

Sat, 03 Dec 2016 05:00:00 EST

Under the U.S. DARPA's (Defense Advanced Research Projects Agency's) Ground X-Vehicle Technologies program, Raytheon is using a lidar to create a 3D model of an armored vehicle's external environment. The sensor's data is presented in an intuitive interface with a high-definition video rendering of

The Prescription for Success: Examining the Big Picture

Fri, 02 Dec 2016 19:00:00 EST

The other day I was reading “Model-based approach examines entire subsea BOP control system rather than address component failures with ‘Band-Aid’ solutions,” and I can’t seem to get it out of my head—please note I’m not even particularly fascinated by (or k

Perpetual Motion Firm Steorn Finally Goes Under

Fri, 02 Dec 2016 13:43:30 EST

Last month, Irish tech startup Steorn permanently shut its doors. Steorn operated as an unsuccessful e-commerce developer from 2000 until 2006, when it announced the development of Orbo, a magnetic battery technology that provided “free, clean, and constant energy,” and rebranded itself

Harnessing Advanced PV Inverters to Stabilize the Grid

Fri, 02 Dec 2016 05:00:00 EST

Residential photovoltaic (PV) systems typically use "dumb" inverters to sync with the grid and will disconnect if a significant fault is detected. However, it is possible for disconnects to destabilize the grid. Fortunately, newer "smart" inverters have a greater ability to stay online and can help

Wash Your Smartphone!

Fri, 02 Dec 2016 05:00:00 EST

Every few years, we are treated to a story that sums up how filthy we are as human beings. Whether we are transferring E. coli via fecal matter to hotel room remote controls, or we are inserting our staph-infection laced fingers into bowling ball-holes, one thing is certain: We are disgusting! And,

Caption This for 12/02/16

Thu, 01 Dec 2016 21:45:00 EST

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

December 1, 1743 – The Birth of Martin Heinrich Klaproth

Thu, 01 Dec 2016 20:00:00 EST

On December 1, 1743, Martin Heinrich Klaproth, the chemist who discovered uranium, zirconium, and cerium, was born. Originally intended to be a clergyman, Klaproth attended Wernigerode Latin School until 1759 when he dropped out and became an apprentice in an apothecary shop. Klaproth worked until h

Beyond El Malecon, Part 3: a Car Show in Cuba

Thu, 01 Dec 2016 14:00:00 EST

Over the last couple of years, the AACA has organized at least a couple “Taillight Diplomacy” trips to Cuba with pretty much the same aim as the posts we’ve been assembling that show Cuba’s current automotive landscape: To document the cars as they have evolved over the last

Bats and Bananas

Thu, 01 Dec 2016 13:00:00 EST

In the process of researching my last blog about Bananapocalypse, I discovered a surprising number of uses for banana peels. Did you know that you can remove a splinter, or a wart, by taping the peel over the splinter or wart? Also, rubbing the peel on a bruise helps make it disappear. Banana peels