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.

Metalworking

cyclones

posted on 11-22-2019

Ten years ago I did a lot of looking at designs for cyclones,but never built one. But recently wanted to make a dust collecter for a sand blaster in the shop that I do little things for. Anyway f... read more »

Lincoln Ranger stop welding

posted on 10-29-2019

I raised the amps from 130 to 145 during this is process the welder complained little spark no we disconnected the lines to see what the problem could be to the principals point of no spark at all ... read more »

Re: Anvil Identification

posted on 06-19-2019

Hi there! I am looking for a couple of old Anvils that an idiot cousin sold that were family heirlooms I am uncertain of what make/brand they were, bu t the ancestor who owned then would have stam... read more »

Covert Charpy Impact Value to Izod

posted on 04-10-2019

Can you please help me , how to convert charpy impact value to Izod value. Is it any standard formaula . read more »

Mechanical part,I need a search term to find and purchase.

posted on 07-08-2019

Hi guys, I'm rebuilding my Radial Arm Saw, most the table, but need to purchase the in this picture. What is it called? Thanks, Mikek read more »

Engineering and Science

High voltage demonstration

posted on 10-29-2019

This is a high voltage demonstration using an inexpensive car ignition coil being driven by a variable frequency, duty cycle and amplitude 555 based mosfet circuit. Circuit schematic: https://w... read more »

coil ohm reading

posted on 07-06-2019

I have an old commercial self propelled mower with a eh18 engine I lost spa rk so I replaced coil with a new one just like the one that came off of mow er.I had spark but engine would not start but... read more »

The best storage solution--bolted steel tanks

posted on 08-25-2019

Since 1989, Center Enamel has been supplying and installing bolted steel ta nks up to 20,000 m3 capacity. Center Enamel provides the best possible combination of the strength and fl exibility of s... read more »

Role of air pressure in diamagnetism

posted on 09-14-2019

Hi, In a gradient of magnetic field, magnetic dipoles of the air are attracted toward the region of intense field such that the air pressure is more in th e regions of more intense field. The for... read more »

Reinforced Thermoplastic Pipe Market 2018 Global Analysis with Top Key Players- Technip, Cosmoplast, Polyflow, PES.TEC, Aerosun

posted on 11-21-2018

The report Reinforced Thermoplastic Pipe Market by Key players highlights t he essential market dynamics of Reinforced Thermoplastic Pipe Market sector . The efficiency of this segment has been stu... read more »

Computer-Aided Design and Manufacturing

Free training videos for learning Solidowrks grasshopper / Rhino / Kinetic Architecure

posted on 02-19-2019

Hi, here are some beginner training videos for learning Modo / Rhino / Solidworks (soon GH) : https://www.youtube.com/user/tgroppi Best Thomas read more »

DEAR ASK A ROBOT: Who is God?

posted on 10-27-2019

fload agi00101.F ok MainLoop There is no warranty for what this software does. TAB-key cycles through display: Normal; Tutorial; Diagnostic. MindBoot time-point vault = 2125 cns = 3000 fyi= 0 E... read more »

recomendations for table top milling setups?

posted on 06-16-2019

thinking of doing some small (and I do mean _small_) milling, to make a set of molds for casting type for hand setting printing (aka Letter Press). Not sure it is a cost effective method of gett... read more »

What is a good 3D freeware CAD program for modifying this DXF camber jig drawing?

posted on 05-31-2019

Do you have experience with 3D CAD freeware on Windows to help advise me? o What 3D CAD freeware might work well for this simple DXF style drawing? The reason I ask is that, often, the expense of... read more »

6th International Conference on Control, Modeling and Computing (CMC 2020) -July 11%12, 2020, Toronto, Canada

posted on 11-15-2019

6th International Conference on Control, Modeling and Computing (CMC 2020) https://icaita2020.org/cmc/index.html July 11%12, 2020, Toronto, Canada Scope 6th International Conference on Con... read more »

I tried to Export the assembly from ProE Intralink workspace to Disk. But I got a message showing "An error occured on Import/Export." Do anyone help me to resolve this ?

posted on 07-28-2017

Even I check the all dependencies everything looks good. All the sub components are exported with out any error. But Every time when i tried to export the assembly file , I get this message. read more »

Model Engineering

Star Racers - Online Model Race For Kids

posted on 07-23-2019

This is a new veteran-ownned company that combines a model design opportuni ty for kids and an online race. You can check it out at www.StarRacers.com This is from our About Us page: Boy or girl,... read more »

DTH and Rotary Drill Rig Suppliers

posted on 02-23-2019

Looking for a company which supply Drill Rigs at affordable cost? Then here you go you are at exact place Focus Mining Services are suppliers of DTH & Rotary Drill Rigs in Both Australia & South ... read more »

Saying Hi!

posted on 08-10-2019

User FidoNet address: 1:305/3 Simple Correction... SO> this simple revelation came to me one morning in the show of all places SO> LOL! This should of read in the SHOWER... not in the show. ... read more »

tube / pipe fit over scaffold tube

posted on 11-07-2019

Hello all I've asked on a couple of newsgroup during the last month, but not their thing... I want to find a tube / pipe, readily available, which will slide over a scaffold tube. For making jig... read more »

Jacob Sparre Andersen has passed away

posted on 12-17-2018

I have been asked to announce to this group that Jacob Sparre Andersen has passed away from stomach cancer on Sunday 16th of December 2018. Jacob was admitted to hospital only a month ago, and des... read more »

LEGO 3D Milling Machine

posted on 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 »

International Engineering (BETA)

Kabel von Einbauleuchten zu kurz

posted on 11-21-2019

defekt ist, habe ich LED Einbauleuchten bestellt. Die haben bei 230V aber nur Kabel mit knapp 15cm. Provisorisch habe ich sie jetzt mit auf dem waagerechten Brett unterhalb der Decke putzt und me... read more »

[MANIFESTO] it.hobby.modellismo

posted on 11-13-2019

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 »

[Conseils d'utilisation] fr.rec.modelisme

posted on 11-02-2019

Archive-Name: fr/chartes/rec.modelisme ======================================= read more »

S: Unverlierbare Schrauben M3

posted on 11-21-2019

Etwas in diesem Stile: https://i.ebayimg.com/images/g/Yn4AAOSw3xJVaeYF/s-l1600.jpg Selbst Schrauben auf der Drehbank entsprechend nachbearbeiten geht Schraubenkopf am besten Flachkopf mit Schlitz ... read more »

[Charte] fr.sci.electrotechnique

posted on 11-02-2019

Archive-Name: fr/chartes/sci.electrotechnique Bonjour, 28 novembre 1999. =============== CHARTE DU FORUM ============&# 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.