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CR4 - Recent Forum Threads and Blog Entries

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

Published: Thu, 22 Feb 2018 16:29:05 EST

Copyright: Copyright 2018

Reality, or Flawed Knowledge of Reality?

Thu, 22 Feb 2018 16:29:05 EST

Check out this link for some thought provoking ideas on perception and reality.

Amateur Astronomer Scores

Thu, 22 Feb 2018 14:55:59 EST

I love it when an amateur in any Science makes an unprecedented discovery. The initial shock wave of a supernova has now been observed.

How Do You Free a Friction Welded Shaft Coupling?

Thu, 22 Feb 2018 07:30:34 EST

Is there any way to free the shaft frozen inside a sleeve coupling by "friction welding". The motor (1.5hp Honda) was driving a pump by connecting the motors shaft to the pumps shaft by a sleeve that included a key held in place by a grub screw. The screw came out and so did the key but they kept u

5G is Coming....What Does it Mean?

Thu, 22 Feb 2018 00:48:15 EST


Wed, 21 Feb 2018 19:58:50 EST

Uhho here comes mommy and better run!

Frequency Rate of Change

Wed, 21 Feb 2018 18:39:18 EST

How do I determine an appropriate setting df/dt (rate of change of frequency) in an under/over frequency relay?

Mindless Door Stuff

Tue, 20 Feb 2018 15:47:53 EST

A red door on a home is sometimes simply a feature that adds to a home’s curb appeal, the overall first impression of your domicile. Sometimes the color of the door can be something entirely different. The earliest historical reference I have found to a door being covered in red is found in t

Load Resistance of NGT

Tue, 20 Feb 2018 14:29:48 EST

Transformer of 16MVA Y connected secondary is grounded through NGT and a load resistance is connected across NGT secondary. Load resistance rating is 600 amps continuous rating.1680 amps 60 sec rating. Voltage drop across the loaf resistance is used to trip the load on the secondary with help of VDG

Safety Tether

Tue, 20 Feb 2018 13:17:21 EST

Over the past 17 years of up/down loading my stump grinder (below) from a van, Twice it has ran away owing to a broken drive chain and once again owing to a disintegrated taper-lock bushing in a drive sprocket. I think I have resolved the reasons for both failures to these worrying events, i.e. u

Branson 2000x Deconfiguration from 2000X d/aed to 2000X ea/ae

Mon, 19 Feb 2018 14:09:47 EST

Problem: I have a branson 2000x d / aed and when I try to integrate it in to a welding cabin by PLC and using hartings to connect it. Branson pass from to have a configuration as d / aed to ea / ae.

Automobilia: Gow Paint Your Flivver!

Wed, 21 Feb 2018 15:38:13 EST

One of the neatest references for everyday-material culture of the past is a Sears, Roebuck and Company Catalog. Sears in its catalog days was to many folks what Amazon is today. You perused pages and pages of everything from workwear to Sunday suits to firearms to tools to camping gear to auto pa

Japan 1990 – The Year that Cars from the Land of the Rising Sun Went Supernova

Wed, 21 Feb 2018 15:33:52 EST

For decades, Japanese cars were about simple reliability and (particularly after 1973) fuel economy over style and speed. A decade after the first fuel crisis, the first Japanese car company (Honda) opened a factory on our shores, in part to get around “voluntary” import restraints. If

Guess the Architecture for 1/20/2018

Tue, 20 Feb 2018 19:00:00 EST

Do you recognize this week's building? Care to take a guess?

Woman of the Week – Beverley Bass

Mon, 19 Feb 2018 21:30:00 EST

Beverley Bass was the first female captain hired by American Airlines and is perhaps best known for her quick decision making on September 11^th, 2001, when she quickly responded and diverted her flight after receiving word of the attacks on the World Trade Center. Bass grew up riding horses in For

All That Glitters

Sat, 17 Feb 2018 05:00:00 EST

Yes. I am absolutely concerned about glitter’s impact on ocean life. Yet, self-involved as I am, I am slightly more concerned about the impact of glitter on my household as it falls from everything in my elementary-school-aged daughter’s possession, from clothing, toys and even her sham

Caption This for 2/16/2018

Fri, 16 Feb 2018 21:45:00 EST

Here's this week's photo: Thanks to Sid_Sidow for the submission.

Fast and Furious, Circa 1962: The Further Adventures of a Hot-Rodding Teen

Thu, 15 Feb 2018 14:00:00 EST

The baby-blue 1940 Ford convertible with top down, engine straining, was doing 90 miles per hour. Wearing no seat belt and sweating, I suddenly imagined myself flying like a cannonball from the rear seat and landing head first on the pavement. We were side-by-side, but losing, to a 1961 Pontiac Bon

The $5,000 Challenge, Valentine’s Day Edition

Wed, 14 Feb 2018 14:00:00 EST

What is it that prompts automotive attraction? Why do some of us favor small cars over large cars, or station wagons over coupes, or four-doors over two? Is it genetics? Is it our experience early in life? Is it Cupid, shooting us with a metaphorical gasoline-dipped arrow at a specific point in time

Guess the Architecture for 2/13/2018

Tue, 13 Feb 2018 19:00:00 EST

SolarEagle provided this week's submission. Are you able to identify his building?

The Last AMC: Jeep’s ZJ Grand Cherokee Turns 25

Tue, 13 Feb 2018 14:00:00 EST

Most histories depict Chrysler’s purchase of AMC as one done merely to gain the Jeep name and discard everything else, yet the former gained far more than a brand from the latter: It inherited a talented crew of engineers and designers, and it also obtained the in-development ZJ Grand Cherokee