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Thank TVP Peter

I've come across a reference to the above steel. Can anyone tell me what is the difference between 20MnCr5E and the 'ordinary' 20MnCr5 I am familiar with?? TIA Peter

At the size of motor being considered you usually get 200% full load torque at startup when started direct on line. Covers a multitude of starting inefficiencies, especially when used with a fluid coupling between the motor and gearbox.

WARNING -- WARNING -- WARNING What is worse than being proved wrong.... Being proved right, so proving the boss is wrong!!

I started "Engineering Drawing" at the age of 13 at Secondary School. At 15 I took an "O" Level in Engineering Drawing (and passed :) ). There followed 2 years part time for a Ordinary National Certificate in Mechanical Engineering which included Engineering Drawing in the first year, but this...

I use all manner of couplings, including gear couplings. The ratings for the couplings I get from the manufacturers rather than try to do it myself.

Just a thought, if you want to compare the hardness why not use a Vickers test?

My memory is that UNC and UNF were post-WW2 standards when the UK was still looking West to the US and Canada. However in the late 1960's the UK started looking East to Europe and metricated.

EN24 is a well known UK steel. It is commonly available in "condition T", meaning it has been heat treated to give a tensile strength of 55/65 T/in2 Depending on ruling section and heat treatment it can achieve 100 T/in2, "condition Z". We use condition T for shafts.

But did anyone take any notice of them. We tend to ignore them and if we get a Patent Agents letter just send back proof of prior art.

If you have an idea but can't afford to patent it, publish it so putting it in the public domain. At least that stops anyone else patenting it, or if they do they end up with a worthless patent.

Get a copy of Scan2CAD v8 that includes conversion of PDF's.

If you really want a laugh ask that all documentation be supplied in International English :)

In the bulk materials handling world as you get more and more esoteric with the machine you're interested in the less and less freely available information there is. This is because those people who know make their living from designing and selling such equipment and they aren't going to give...

Here's a few pages from Dickason on spiral chuteshttp://files.engineering.com/getfile.aspx?folder=1662ddab-fa32-4fb6-976f-ab5acf2812e6&file=MX-2300N_20100721_111213.tif

If you're doing sheet metal then you need this book, The Geometry of Sheet Metal Work by Dickason !! http://www.amazon.co.uk/Geometry-Sheet-Metal-Work/dp/0582009618/ref=sr_1_2?ie=UTF8&s=books&qid=1279569344&sr=1-2

Acajun The reason I asked for the derivation of the Transmission Element Factor was that I could not understand how for a chain drive it could be anything other than 1. I suppose you took it from a publication somewhere as no derivation is quoted. The value of 1 that Sonicflow quotes for a...

Acajun, Can you please explain the derivation of the "Transmission element factors" you have quoted. And surely the output torque is determined by the driven machine not the motor unless the required machine power is equal to the motor power?? Also, my experience is that the position of the...

Is 200-500 ppm the same as 200-500 mg/l ?? There isn't really any free water in the sludge cake, as to whether any water in the cake is oxygenated, who knows.

Years ago we did our own heat treatment in a gas fired furnace. 95% of this was either carburising or carbo-nitriding to give a case hardened surface. Occasionally some of the components were just through hardened. While half expecting a slightly de-carburised surface we found a slightly case...