Welcome to Online Community for Engineers and Metalworking Enthusiasts

Some of our best rated resources

Have a question or want to start a discussion? Post it! No Registration Necessary

PolyTechForum.com website provides free, on-the-go reading and posting access to 32 Usenet discussion groups, completely anonymously and without requiring registration.


Re: What has usually happened?

author: Poor dumb Curt posted 05-28-2017

No, you gun-grabbing fascist turd, he's RIGHT! > The NRA used to be an orginization of sporting > people; however, those days are long gone. > > Jones BULLSHIT LIE! Every damned time you st... read more »

[VIDEO] I had an interesting fail -- steel cabinet collapsed and fell

author: Ignoramus13612 posted 05-19-2017

This cabinet had been in my shop for something like four years and its load did not change much. It sat by the door. Then one day it suddenly collapsed, totally unprovoked, probably due to high win... read more »

Table of RPM for drill size

author: news16 posted 03-23-2016

Is there a url around of a nice table of rpm for each drill size for the various material. Each time I need to use the vertical drill I figure it out, but it would be handy to final attack such ... read more »

Advice for novice

author: giovannigozio1974 posted 11-24-2016

Hi to all, I'm asking for advice in order to start working on metals. Any idea will be much appreciated, from necessary tools to equipment etc etc. Regards read more »

Very clever machinist, Keith Fenner.

author: Jim Barber posted 12-11-2016

Neglect https://www.youtube.com/watch?v=ExIpXTRRUvs Resurrection The refurbishment of the Wood chop saw, seen in Neglect... https://www.youtube.com/watch?v=LKmwi2QR3Ug Resurrection Part 2 https... read more »

Engineering and Science

Who can tell me how much about one set 3T induction furnace?

author: Edmond posted 05-08-2017

Hello,sir or madam, Do anybody know 3 ton capacity 6 rectifier 12 pulse;steel shell;cast iron melting furnace ballpark estimate? Plan to machine tool manufacturing. Thanks. read more »

Wipac Cj magneto drive gear

author: Huw77 posted 05-10-2017

Hi, I've recently acquired my first stationary engine, a 1949 Ruston pt. The magneto it came fitted with is a Wipac cj,seems to be missing a part (gear)to drive the mag.....any help , and advice wher... read more »

Scientists decipher the nanoscale architecture of a beetle's shell

author: JEMM posted 02-23-2017

A professor of mechanical and materials engineering has found a way to analyze the fibrous nanostructure of a beetle's lightweight but durable shell. https://www.sciencedaily.com/releases/2017/0... read more »

problem with ADINA-T module

author: staramsiejakmogeale posted 09-16-2016

I would like to modell some problem using ADINA-Thermal. Unfortunatelly gov erning equation of heat conduction is Poisson's equation while I would like to solve Kirchhoff-Fourier equation (Poisson... read more »

Re: Please Help... Polishing Polyethylene

author: Renee Keller posted 05-23-2017

I recommend buffing compound for a finer polishing. Toothpaste is a heavy grit. read more »

Computer-Aided Design and Manufacturing

keypoint matching

author: rnsweta posted 04-17-2017

Hi, I have been asked to do familiar scene recognition with sift keypoint match ing and homography. I have adapte dthe sift_mosaic.m code from vlfeat libra ry. My results show many inliers which ... read more »

Mapping positive definite matrix through a similarity transformation

author: Southern.Cross posted 05-25-2017

Hello all, This is my first post on the group. I'm hoping that the group can help me b etter understand something. I'm designing a feedback controller with LQR in Matlab. My LTI model (A,B,C an ... read more »

Work light

author: Brian posted 05-06-2017

We have a Takang TNC-05 and Yam CK-2 Lathe, both use the same type of work light inside. It has a bulb built in to a small single wire harness. I assume , the whole thing gets changed? Any idea what ... read more »

Senior Mechanical Designer/Drafter (SolidWorks) @ Zo diac Pool Systems ? (San Diego) Vista, California

author: Michael Galvin posted 03-23-2017

Senior Mechanical Designer/Drafter (SolidWorks) @ Zodiac Pool Systems ? ?? (San Diego) Vista, California Zodiac isn't just a pool supply manufacturer - we focus on Smart Pool Produ cts, from ph... read more »

Creating a viewport in modelspace?

author: wiersma1978 posted 06-29-2016

Dear Reader, I need some help using Autocad. I'm currently working on a drawing that has multiple views of one floor; construction view, mechanical view, electrical view, and so on... I got these v... read more »

super-affordable HDMI video clip conferencing devices by VU Telepresence

author: hdmisplitter posted 11-03-2015

Just put, this extenders undoubtedly are a fantasy are available legitimate delivering needing improved, much more cost-effective, much more versatile AV setups. Utilizing high-quality, low-cost CAT5... read more »

Model Engineering


author: RustyHinge posted 05-12-2017

Gauge OO GRAFAR SR carriage 2 x Graham Farish Pullman car 2 x Different Pullman (dining?) car All in original packaging. Now I wish I still had those Graham Farish locos I had when I was a pre... read more »

Gilbert AF S-Scale Knuckle Coupler

author: J.B. Wood posted 03-28-2017

Hello, all. The spring-loaded plastic part on the subject recently broke off rendering the coupler non-functional. The coupler and bogie appear to be a single unit that is riveted to the bottom... read more »

RMF Tiger I Gruppe "Fehmann" HELP

author: jmpaliza posted 05-14-2017

On the instruction sheet step 6 you have to decide on workable torsion bars or not. Then on step 7 you have a choice of different wheels sets one from sprue X the other from C, it goes on to 8 and 9.... read more »

Track and Couplings (N Gauge) query

author: Mike Smith posted 05-05-2017

Okay, after a long absence I'm doing model railways again (actually my end is really more toy trains than model railways). My interest was rekindled by helping a chap set up - Starting with a smal... read more »

Sbach 30 cc gas Orange, Black, White (73"w.s.)

author: JosephJ711 posted 02-06-2017

Wanted: N.I.B. (arf) Sbach 30 cc ORANGE,Black,white read more »

rec.models.rockets FAQ Part 02 - Names and Addresses

author: rmrfaq posted 05-15-2017

Archive-name: model-rockets/addresses Rec-models-rockets-archive-name: rockets-faq/part02 Posting-Frequency: weekly Last-modified: 2002 May 14 URL: http://www.ninfinger.org/~sven/rockets/rmrfaq.t... read more »

LEGO 3D Milling Machine

author: passerby posted 03-31-2013

Saw this in another group, could not resist re-posting here: http://youtu.be/oF0pMILT7_Y NXT-based. Given that it's Easter today, can't resist the temptation to compare it to the Eggbot - similar des... read more »

Re: Soap Bubble Machine built from LEGO only!

author: Jacob Sparre Andersen posted 02-23-2017

derjoshder writes: It looks good. :-) Not much support for it yet. :-( Play well, Jacob -- Jacob's LEGO trains: http://lego.sparre-andersen.dk/Transport/Tog/ read more »

International Engineering (BETA)

Lebensdauer Betriebsstundenzaehler

author: Rolf Bombach posted 05-01-2017

Hat jemand Erfahrung mit der Lebensdauer von Ich hab nur wenige in Betrieb, daher ist meine statistische verstorben. Elektronik ausgewandert nach Transjordanien. Geier warum), der hat mechanisch n... read more »

Siedendes Wasser im U-Rohr

author: Heiner Veelken posted 03-31-2017

Angenommen, ich pumpe siedendes Wasser nach oben durch ein senkrechtes Rohr. Da der statische Druck abnimmt, wird das Wasser teilweise Frage: Kann der Zustand des Wassers (Druck, Temperatur, etc.) ... read more »

CI REF0032, c'est quoi?

author: laurent posted 05-11-2017

bonjour, a tous, j'ai une platine avec un CI DIP 40brs refrence REF0032, quelqu'un connait? a priori c'est une interface entres??? vers sortie // 4*8 bits... bonne journee, laurent read more »

[Conseils d'utilisation] fr.rec.modelisme

author: J.F PION posted 05-02-2017

Archive-Name: fr/chartes/rec.modelisme ======================================================================= = Conseils d'utilisation du forum fr.rec.modelisme = ==========... read more »

[MANIFESTO] it.hobby.modellismo

author: Gruppo Coordinamento NEWS-IT posted 05-27-2017

In fondo a questo articolo, inviato automaticamente ogni mese, troverai il manifesto di questo newsgroup (it.hobby.modellismo). . Tieni presente che esistono anche questi newsgroup it.test ... read more »

Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here. All logos and trade names are the property of their respective owners.