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CR4 - Recent Forum Threads and Blog Entries

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

Published: Mon, 11 Dec 2017 08:18:06 EST

Copyright: Copyright 2017


Mon, 11 Dec 2017 08:18:06 EST

What causes a flow meter to run up to a maximum flow rate with pump start up and then reduce to zero, immediately while pump is still running and delivering flow of material physically into the tank in the plant.

Changing Third-Party Hosting Site in Old Threads?

Mon, 11 Dec 2017 05:49:24 EST

Some of my pictures in previous threads are no longer being supplied by the third party hosting site. How can I change/edit the hosting site for my picture(s) in an old thread?

Cool Robots

Sun, 10 Dec 2017 20:25:25 EST

OK kinda freaky...

Joystick Question

Sun, 10 Dec 2017 12:08:08 EST

I have joystick in hyd oil system ,contact point are connected in series and parallel with 1K ohm resistance .why ? thanks in advance

A New Fuel Cell Technology?

Sun, 10 Dec 2017 11:48:48 EST

Hi, I was introduced to a guy last night who said that he worked for a company which made fuel cells that ran from natural gas. I have only come across the original type that work with Hydrogen before, so I was quite interested but he didn't know a great deal other than the fuel gas. Has anyone an

Ammeter Not Reading Correctly

Sat, 09 Dec 2017 20:28:30 EST

I have a CT of 800:1 and an ammeter with Scale 0-2000 amps AC It says on its name plate 1MADC which i think means that when it has 1 milliamp dc current it will go to full deflection i measured resistance between its terminals that is coming 172 ohms Now I took a 12 VDC battery and connected a dec

Calculating Dewatered Cake Production from Belt Filter Press

Sat, 09 Dec 2017 14:41:55 EST

I need to calculate the outgoing Q from a belt filter press given the following parameters: -Incoming sludge from aerobic digesters: 21,248 gal/day @ 2% solids -Cake solids concentration of 18% -Solids capture through the belt filter press is 95% Assume 1.05 S.G. for the sludge and cake, where a

Small Gasifier for Coal

Sat, 09 Dec 2017 06:20:51 EST

It seems that a clean coal technology for small scale power plants is just around the corner...1-5 megawatt plants for what purpose you ask, well a good guess would be charging stations for the expanding fleet of EV's being produced maybe....

Switch 230 Vac Used to 120 Vac

Fri, 08 Dec 2017 20:37:14 EST

Is it possible to use a 230 Vac switch in a 120 Vac electric instalation? I have to contacts, phase 120 Vac and neutral but my switch is prepare for 230 Vac or 24 Vcc.

Lifting Lug Design Loads

Fri, 08 Dec 2017 08:44:11 EST

Folks need your help I have 100 ton vessel as errection weight it is horozontle vessel with 2 lifting lug how to get forces for WRC ?? If I m using sparder beam TYIA

Uptown Rats Versus Downtown Rats

Sat, 09 Dec 2017 05:00:00 EST

I think most of us can agree: rats are vile, disease-carrying vermin that overrun city streets leaving destruction in their wake. However, my view of them may have softened a bit this week thanks to a study from Fordham University and Providence College. According to the study, rats who have set up

Caption This for 12/08/2017

Fri, 08 Dec 2017 21:45:00 EST

This week's image: Thanks to Nigh for the submission.

Holiday Memories: Holiday Decorating Tech Style: Confessions of a Light Junkie

Fri, 08 Dec 2017 15:05:00 EST

This article about automating your holiday light show gained a lot of popularity on Electronics 360.

He Wasn’t Fast: the Legend of Prince Valiant

Thu, 07 Dec 2017 14:00:00 EST

Talk about “Plain Jane” cars. The 1965 Plymouth Valiant 100 I bought for $500 in 1969 was about as basic as they come. No fins, portholes, hood ornaments, wire wheels, “bullet” grills/bumpers, white-wall tires, two-tone paint jobs or chrome strips adorned “Prince,&rdqu

Holiday Memories: From the CR4 Archives

Wed, 06 Dec 2017 14:03:03 EST

I'll be posting links to holiday-related CR4 blogs and threads from now through the end of the month. These are too good not to repeat! If any of you have a favorite you'd like to see her, please PM me. Today's entry, from 2015: Holiday Lights Unlikely Source of Wi-Fi Interference Image credit:

U.K. Court Upholds Ruling That Could Threaten EU Motorsports

Wed, 06 Dec 2017 14:00:00 EST

In ruling for a charity that benefits crash victims earlier this month, the High Court of England and Wales supported a European Union court ruling on compulsory insurance that racers and racing fans believe will decimate motorsports across Europe. The High Court, in its ruling for the plaintiff in

Guess the Architecture for 12/5/2017

Tue, 05 Dec 2017 19:00:00 EST

This week's building submission is courtesy of silvCrow. Thank you! Care to take a guess at what building it is?

Mitsubishi’s “Re-Model A” Pays Homage to the Brand’s First Automobile

Tue, 05 Dec 2017 14:00:00 EST

In 1917, the Mitsubishi Shipbuilding Company of Kobe, Japan, introduced its first automobile, the Model A limousine, based upon Fiat’s Tipo 3. A century later, Mitsubishi is still building vehicles, and to commemorate its centennial, the Japanese automaker partnered with West Coast Customs to

Woman of the Week – Megan McCoy Jones

Mon, 04 Dec 2017 21:45:00 EST

Megan McCoy Jones is the Executive Vice President and Chief Operating Officer at McCoy’s Building Supply. She’s been around the business her whole life, as it’s been her family’s livelihood for more than 90 years. During her summers as a kid, she’d spend time at the co

German Christmas Markets

Mon, 04 Dec 2017 16:15:40 EST

We are about to start the 2017 holiday season, and I would like to talk about it. Since my childhood I have always enjoyed the beauty of these days: the scent of the Christmas tree in the living room of my house, the lights and the music that spreads all over the city, the camaraderie of the people