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CR4 - Recent Forum Threads and Blog Entries

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

Published: Fri, 28 Apr 2017 14:03:49 EST

Copyright: Copyright 2017

Cryogenic Computing

Fri, 28 Apr 2017 14:03:49 EST

Back in the '70's, I read about experimental super-cold computers, that were cooled by liquid helium, and could perform thousands of times faster than conventional computers of the time. The components were joined with mercury-wetted connections. I have not heard much about it since. I can only i

Wire Crimping Dies

Fri, 28 Apr 2017 07:15:37 EST

Maybe someone can point me in a direction for this one. We use a table top model AM-10 pneumatic terminal crimping machine. It takes most of the standard wire terminal dies, like used in the Ideal Crimp Master. Amazon and Ebay has many different die sets listed...except the one that I need. I am l

Here's One for the Books

Thu, 27 Apr 2017 20:56:07 EST

Just ran across this and thought everyone might get a kick out of it

VFD For 2 Motors Driving Same Equipment - Continuation and Decision Arrived

Thu, 27 Apr 2017 15:27:51 EST

Three weeks back I have posted a problem about VFD Motor and Gear Box and the link is Please open this link and read so that you can re-call your memory for this topic, and read furthe below. 23 Members have responded with good suggestions and I a


Thu, 27 Apr 2017 14:58:49 EST

This one seems kind of stupid so keep the laughter down Came across something today on a drawing by a company from a different company. Its a spec they say "short circuit resistance" Its measured in amps? Seems rather perplexing. Are they referring to the short circuit availability on the feede

UL508A 3 Phase Color Code?

Thu, 27 Apr 2017 14:36:40 EST

Hello I have a copy of UL508A Trying to locate the appropriate wire color for 3 phase wiring I was always under the impression of the following L1 = Brown L2 = Orange L3 = Yellow Does someone happen to know the section of 508A that describes this for reference? Thanks


Thu, 27 Apr 2017 14:29:21 EST

I spoke with a local electrician yesterday about installing new conductors for a remodel for an evaporative cooler install. He said that he would use THHN wire. His plan would be to add another circuit breaker to the existing panel box, so the cooler would have it's own dedicated supply. He stated t

2250kW 3.3kV Air Cooled And Water Cooled Drive

Thu, 27 Apr 2017 14:12:55 EST

We are planning to install a 2250kW 3.3kV crushing unit motor with a VFD. But VFD Manufacturers are recommending to use water cooled drive since it is in a continuous 24/7 operation. And the price difference between air cooled and water co0led drive is about 50%, is it necessary to use watercooled d

Cell Phone ID's and CCTV

Thu, 27 Apr 2017 13:57:05 EST

Hey all fruitless searches on my part, so the question is.... has anyone heard or know of a CCTV camera (system) that while monitoring people moving in a secure area that can also collect the IMEI or ESN off the cell phone that a person might be using or carrying? I have found several sites and pr

Recycled Plastic Makes Asphalt Roads 60% Stronger

Thu, 27 Apr 2017 13:56:55 EST

I came across this article and thought I'd pass it along. I'm impressed by such a simple solution producing such impressive results. I know here in the Northeast we could use stronger, longer lasting asphalt. U.K. startup uses recycled plastic to build stronger roads We’ve seen the birth of

Mini Tops British Poll of Best British Cars of All Time

Fri, 28 Apr 2017 13:00:00 EST

A poll by British motoring magazine Auto Express to determine the 50 best British cars of all time has put the classic 1959-2000 Mini in the number one spot, edging out the Jaguar E-type and the Land Rover Series/Defender ranges. Those polled included unidentified members of the magazine’s sta

Hacking the Lake

Thu, 27 Apr 2017 19:00:00 EST

As a Pennsylvania native, Lake Erie was always felt like our great lake—even though I grew up hours from it and other states may have a more significant claim to the lake. We learned to view the zebra mussel with horror and the lake with pride. Perhaps that’s why a mention of the newest

Fact Check: Henry Ford Didn’t Design the Model T as a Multi-Fuel Vehicle

Thu, 27 Apr 2017 13:00:00 EST

Ask old-timers what they’ve run their Model T on beside gasoline, and the responses will start to sound like the list of potential fuels for the Chrysler Turbine car; that is, anything combustible: coal gas, diesel, kerosene, even granddad’s corn likker. But the truth regarding the T &nd

Researchers Build a Ultrasonic Heat-free Clothes Dryer

Thu, 27 Apr 2017 04:00:00 EST

Earlier this month Business Insider reported that a team of researchers from Oak Ridge National Laboratory had developed a prototype clothes dryer that doesn’t use heat. The team developed a mechanical drying technology based on piezoelectric ultrasonic transducers that translate electricity i

Open Diff: My Favorite Gear

Wed, 26 Apr 2017 13:00:00 EST

There’s a 2002 Subaru WRX wagon in my driveway. All stock – 16-inch wheels, stock turbo and intercooler, no mods to speak of beyond a K&N air filter. Even in its semi-retirement, I drive the crap out of that car: I bought it new in 2001, and to date, it’s covered 206,000 miles

Are You Really Hungry?

Wed, 26 Apr 2017 04:00:00 EST

As a baby, when you were full you would stop eating. And you would only eat again when you were hungry. Don’t you wish it was like that again? That you didn’t just crave a donut because that’s what popped up on Facebook or you didn’t eat the bread on the table just because it

Rubber Floor Mats for Mobile Equipment

Tue, 25 Apr 2017 20:55:00 EST

Rubber floor mats for mobile equipment protect the cabin floor, support employee safety, and provide acoustic insulation. The metal flooring that’s used inside the cab is strong and durable, but operators track mud, snow, dirt, and water inside. Rubber floor mats protect these metal surfaces a

Guess the Architecture! for 4/25/2017

Tue, 25 Apr 2017 18:00:00 EST

Do you recognize this building?

Scavenger Hunt: Drive Me Wild

Tue, 25 Apr 2017 14:42:56 EST

Due to the format of our Hemmings Find of the Day feature, we don’t always get to highlight the more unusual vehicles in the classifieds, but that doesn’t mean they’re not worth checking out. And there are some oddities and off-the-wall one-offs sprinkled throughout th

Woman of the Week – Jane Cooke Wright

Mon, 24 Apr 2017 20:40:00 EST

Jane Cooke Wright (also known as "Jane Jones”) was a pioneering cancer researcher and surgeon. She is most known for her contributions to chemotherapy, specifically with developing the technique of using human tissue culture rather than laboratory mice to test the effects of potential drugs on