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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, 23 Jan 2017 13:58:02 EST

Copyright: Copyright 2017

Strainer in Steam Line

Mon, 23 Jan 2017 13:58:02 EST

Can we use strainer in vertical steam? How? And can we use "Y" type strainer?

Three-Phase Alternator

Mon, 23 Jan 2017 12:57:28 EST

If prime mover rotates in reverse direction what happened to the current in the alternator

Contactor Part Fixing

Mon, 23 Jan 2017 08:22:15 EST

I removed this part from the siemens 3TF47 contactor. Now I forget where to put it back, I do not have another contactor to compare. What is the purpose of this part? the manual does not mention about this part. If anybody have experience with this, Please help me.

Help Tuning a Ping Putter's "Ping"

Sun, 22 Jan 2017 21:22:11 EST

This is not golf related. Here's the problem: The old, original Ping putter (BeCu head) I had made a very distinctive "ping" sound when striking the ball. I left it on the golf course and when I went back it had disappeared. My fault. I bought a new one last year and to my dismay the ping is a low

Blanking / Punching of SS Coil

Sun, 22 Jan 2017 12:13:26 EST

I am newbie to blanking operation. I am manufacturing cutlery items and for the same i use blanking of SS420 coil. I do have press tools for different products with me. But i am facing one issue repeatedly. The punch gets wear out/chip off very frequently. When consulted the tool/punch supplier, i

Three-Phase Problems

Sun, 22 Jan 2017 11:16:55 EST

Hi, Say in a three phase system, in R phase we have a line current 0f 5 Amps, in Y phase of 6 amps, and in B phase a line current of 4 Amps. But it is visible that the load is not balanced in three phases. How to go for load balancing? Regards,

Rubberised RV Roof Repair/Replacement

Sat, 21 Jan 2017 20:46:30 EST

I've a '93 Fleetwood Flair whose roof needs resealed/replaced and looking to do it myself. Dicor seems to have what I need, have good reviews online and have posted a few videos, but I've no experience with their products nor with doing this myself. The previous owner tried to 'DIY-it' but failed

Generator Neutral Grounding

Sat, 21 Jan 2017 13:47:45 EST

a 15MW,6.6KV generator neutral is grounded through 30KVA,6.6KV/200V transformer to limit fault current to 25A. any idea what will be the secondary loading resistor value and the grounding transformer impedence referred to any side.

Seven Main Ferritic Metals (and Alloys) and 14 Secondary... Student in Need

Sat, 21 Jan 2017 10:41:27 EST

Hi! Im student from Poland and i have report to write on Material Science. At first it looked fine and timeconsuming, but easy... but now... Uncle google failed me. My topic is "7 main ferritic metals and 14 secondary". I just need names of these metals, we have big library so then i will have al

Low Capacitance Coupling in Mains Step-Down Transformers

Sat, 21 Jan 2017 05:22:28 EST

Hello friends, I am looking for some help from manufacturers of "Low capacitance coupling in mains step-down transformers" for instrumentation 10W to 100W power range. I find huge RF signal 2MHz to 20MHz range entering into secondary coil. It is perhaps from nearby air force station from their rada

Defects Actually Strengthen Roman-era Concrete

Mon, 23 Jan 2017 05:00:00 EST

Small defects known as screw dislocations help account for the superiority of the Roman Empire's concrete. These defects provide small-scale plasticity that allows hardened concrete to adjust to stress over time. Researchers say that this new knowledge paves the way for designing stronger concrete a

ON Semiconductor Showcases Solutions

Sun, 22 Jan 2017 05:00:00 EST

ON Semiconductor showcased its portfolio of solutions for the effective implementation of  USB Type-C applications at the 2017 Consumer Electronics Show. USB Type-C is the rapidly emerging default industry standard for wired, smart, rapid charging, and high-speed data transmission to sup

At CES 2017, NXP and Microsoft Demo Secure IoT Solutions

Sat, 21 Jan 2017 05:00:00 EST

NXP Semiconductors has worked with Microsoft to develop an end-to-end solution project for securing IoT connected things using Microsoft Azure IoT Hub. The project was demonstrated at CES and combines the best of hardware and software security with other capabilities. ------- Editor's Note: This

I Honestly Swear

Sat, 21 Jan 2017 05:00:00 EST

As a lover of all words (well, almost all words; see: moist), I have always had an appreciation for people who could string expletives together in unexpected ways. I’ve felt that the user made a stronger, passionate, more emphatic point with the use of a few colorful expletives. And it seems

How Checker Remained in Business After the End of Taxi Production, Building Everything Including the Kitchen Sink

Fri, 20 Jan 2017 14:00:00 EST

[Editor’s Note: The folks at the Checker Car Club recently sent us the below article from their newsletter detailing exactly how Checker, which stopped building cars in 1982, remained in business until 2010. Jim Garrison, a 32-year veteran with Checker, provided the story and photos.] It is a

Test for Reactor Vessel Damage Assessment

Fri, 20 Jan 2017 05:00:00 EST

An analytical method pioneered by MIT researchers could change the way operators measure damage to nuclear reactor vessels. This method could potentially provide continuous monitoring and prevent unnecessary replacement of materials. The testing method uses acoustic vibrations to gauge material dama

Caption This for 1/20/17

Thu, 19 Jan 2017 21:45:00 EST

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

The Nature of Structure

Thu, 19 Jan 2017 16:00:00 EST

The other afternoon I was reading about how sea sponge spicules could inspire stronger columns, and it reminded me of a structures course I took in college. Let me set the scene for you: 25 terrified first-year students and an ancient ex-Turkish military man with an accent so strong you couldn&rsquo

FIA Joins Effort to Demand Restoration of the Bonneville Salt Flats

Thu, 19 Jan 2017 14:00:00 EST

As racers and supporters of land-speed racing at Utah’s Bonneville Salt Flats prepare to go to Congress with demands for the restoration of the racing venue, the international racing organization that oversees land-speed records has thrown its support behind those demands. In a letter to the

FINALLY...A Standardized Japanese Toilet

Thu, 19 Jan 2017 05:00:00 EST

Many aspects of Japanese culture baffle Westerners. Yaeba, or the practice of implanting vampire-like canines, is a popular beauty technique among young women. There are hotels where you can sleep in capsules and restaurants that serve gourmet canned food. Scores of young men choose to cloister them