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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 Mar 2018 13:00:00 EST

Copyright: Copyright 2018

Tek 2445A no Chanel 1 or 2 Vertical.

Thu, 22 Mar 2018 02:44:38 EST

I have a used (of course) Tektronix 2445A scope and I can calibrate Channel 3 and 4 fine, but Channel 1 and Channel 2 have no vertical when a signal is applied. The traces are there and the horizontal and vertical positions can be changed, but the display will not show any vertical change when a sig

What are the Grooves for on Square Taper Washers?

Wed, 21 Mar 2018 20:29:22 EST

There was recently a question about substituting different taper washers. I just found the specs. and copied them into an answer but Codemaster asked a good question. I've found that the washers are used on U sections:- And I beams:- But I can't find out what the grooves are for. Anyone know

"Toxic" Scented Candles

Wed, 21 Mar 2018 14:29:39 EST

My wife recently purged our house of scented candles because she read somewhere that burning them is harmful. I did a little research and these are the arguments: -Wicks may contain trace amounts of lead and heavy metals -Scents may cause allergic reactions or worsen asthma (I understand this one)

A Better Basket

Tue, 20 Mar 2018 23:00:39 EST

kagome basket in metal has quantum apps?

Job Sharing Experience

Tue, 20 Mar 2018 12:54:30 EST

Have any of you had direct experience with job sharing, or do you know someone who has? I'm particularly interested in engineering and technical positions. I've found some interesting articles online, including a very recent one about two GE engineers who've shared a position for 20 years. I'd like

Proton Battery

Mon, 19 Mar 2018 20:14:14 EST

This looks promising. "Researchers from RMIT University in Melbourne, Australia have demonstrated for the first time a working rechargeable "proton battery" that could re-wire how we power our homes, vehicles and devices" This is the RMIT-developed proton battery connected to a voltmeter. The wo

Self-Driving Uber Car Kills Arizona Pedestrian

Mon, 19 Mar 2018 19:04:17 EST

OK, it's no longer a theoretical question. Comments?

Slot Cells Rotor Insulation

Mon, 19 Mar 2018 16:11:57 EST

Hi, we have an 200MW generator, 2 poles, 3600 RPM, moved by a turbine. Recently we hired a Company to repair the rotor and the changed the insulation of slot cells and the inter turn insulation. But I want to know if there any way to test this insulation in order to be sure it's a good insolation a

AC-DC Power Supply and Load Bank Build

Mon, 19 Mar 2018 14:58:26 EST

We are attempting to build a few items as we currently build high power dc power distribution units (up to 5kW) Our lab only has 120 single phase service so our first goal is to build a power supply capable of providing adequate service to our distribution units at 28VDC/5kW Our next problem is test

CR Challenge

Mon, 19 Mar 2018 14:14:54 EST

Does anybody remember the CR designer challenge from the 1980s? The CR stood for Chicago Rawhide, whose main business is oil seals, from the web it looks like they've been taken over by SKF. I don't know whether that CR has anything to do with the CR of this forum, I tried to find out but it didn't

Utah Off-highway Vehicle Bill Aims to Expand State’s Trail Infrastructure

Thu, 22 Mar 2018 13:00:00 EST

It may sound like a tedious bit of administrative red tape and paper shuffling at first, but a bill pending in the state of Utah, should it pass, promises to redirect millions of dollars toward trail building and maintenance in some of the country’s premier off-roading destinations. Introduce

Golden by Design and by Dilapidation: Golden Sahara Breaks Cover After Decades in Hiding

Wed, 21 Mar 2018 13:00:00 EST

For several years it toured the country claiming a Guinness world record for “world’s most expensive automobile,” and it very well may have been, given the extensive modifications and futuristic technology that went into building it. But then its owner inexplicably hid it away 50 y

Guess the Architecture for 3/20/2018

Tue, 20 Mar 2018 18:00:00 EST

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

The Load-Down on this Mercedes-Benz Transporter: Porsche Commissioned It

Tue, 20 Mar 2018 13:00:00 EST

Of all the ways to load a car onto a truck for transportation, German utility truck builder Ruthmann may have come up with one of the oddest and yet most practical method for its so-called Gewichtsbilanz Schraeghubwagen, a truck that Porsche commissioned and that will cross the auction block this we

Noise Control and Acoustic Insulation: Sound Sources and Frequencies

Mon, 19 Mar 2018 22:51:32 EST

Acoustic insulation absorbs, transmits, or redirects sound – a form of energy that travels in waves. Unwanted sounds, or noise, aren’t just unpleasant to hear. They can harm human health, jeopardize worker safety, and contribute to structural fatigue. The consequences of noise can be sev

Woman of the Week – Zaha Hadid

Mon, 19 Mar 2018 20:30:00 EST

Zaha Hadid was an Iraqi-British architect known for her daring architectural designs and was often described as “Queen of the Curve” for her buildings. She was the first woman to receive the Pritzker Architecture Prize in 2004, architecture’s version of the Nobel Prize. She receiv

City of Detroit to Take a Stab at Redeveloping Former AMC Headquarters

Mon, 19 Mar 2018 16:01:00 EST

Plenty of moving parts have gone into the negotiations behind a massive land swap deal between Wayne County and the City of Detroit, but if everything works out, the city will soon take possession of the former American Motors headquarters on Plymouth Road with an eye toward redeveloping it. While

Is Alexa Laughing at You?

Sat, 17 Mar 2018 04:00:00 EST

Laughter is generally a pleasant sound, unless of course that laughter comes from an unoccupied corner of your home. At least this is what users of Amazon’s Echo and Echo Dot have found out in the last few weeks amid reports that voice-enabled Alexa has been laughing at users…unprovoke

Caption This for 3/16/2018

Fri, 16 Mar 2018 20:45:00 EST

Here's this week's image: Thanks to HUSH for the submission.

Could 3D Printed Parts Ensure the Longevity of the Collector Car Hobby?

Thu, 15 Mar 2018 13:00:00 EST

Own old cars, trucks or motorcycles long enough, and sooner or later a common problem arises: A needed part is no longer available. Porsche Classic has recently announced an innovative solution (for a select grouping of components, anyway), which raises the question: Can 3D printed parts eventually