One of the first challenges for anyone taking up engineering as a hobby is making the right choices of materials. Often the easy way out is to simply choose materials that other people have used successfully for similar applications, but sooner or later you will find yourself wanting to make better informed decisions. A particularly confusing area is choosing between different steels. You will often see descriptions like ‘bright mild steel’, ‘black bar’ or ‘case hardening steel’. While this may help you get something more or less right, it helps to understand the more formal designations used by steel stockholders and which you may come across in articles from time to time.
There are two systems you will probably come across in the UK. The longest standing are the ‘Emergency Numbers’. These were established during the Second World War to promote consistency in the products of different steel manufacturers. Clearly if you wanted steel for making guns or armour in wartime, you wanted to be able to specify the composition whatever the source, rather than having to work out which of each manufacturer’s range of products would suit. These numbers all take the form of the letters EN followed by a number for the composition of the steel and sometimes a letter to show how it has been heat treated. In very rough terms the higher the number the higher the carbon content of the steel.
ãã®èšäºã¯ Model Engineers' Workshop ã® May 2020 çã«æ²èŒãããŠããŸãã
7 æ¥éã® Magzter GOLD ç¡æãã©ã€ã¢ã«ãéå§ããŠãäœåãã®å³éžããããã¬ãã¢ã ã¹ããŒãªãŒã9,000 以äžã®éèªãæ°èã«ã¢ã¯ã»ã¹ããŠãã ããã
ãã§ã«è³Œèªè ã§ã ?  ãµã€ã³ã€ã³
ãã®èšäºã¯ Model Engineers' Workshop ã® May 2020 çã«æ²èŒãããŠããŸãã
7 æ¥éã® Magzter GOLD ç¡æãã©ã€ã¢ã«ãéå§ããŠãäœåãã®å³éžããããã¬ãã¢ã ã¹ããŒãªãŒã9,000 以äžã®éèªãæ°èã«ã¢ã¯ã»ã¹ããŠãã ããã
ãã§ã«è³Œèªè ã§ã? ãµã€ã³ã€ã³
Readers' Workshops - Patrick Cubbon
Patrick Cubbon describes his workshops â a portable one from 1963 and the current accommodation
Desktop Gear Hobbing
Toby Kinsey has designed this fascinating piece of gearmaking equipment
The John Stevenson Trophy 2020
Many readers and forum members will remember John Stevenson, a contributor to MEW but best known for his larger-than life presence on the Model Engineer forum.
From the Archives: Twist drill Sharpening by the Four Facet Method
Giles Parkes, MEW Issue 64, February/March 2000
Dividing on the Warco 220 Lathe
Peter Shaw describes a mandrel dividing attachment for this popular lathe that can be adapted to fit many other benchtop machines
Choosing Steels
Stub Mandrel offers some advice on choosing the right steel for the job
A Storage Story
Robin King shares the lessons learned from his experience of workshop moves
A Simple Drill Grinding Aid
A newcomer to our hobby was having trouble sharpening drills, so Howard Lewis made a simple aid for him
Yet Another Bodge-Up!
Peter Shaw finds a use for some aged homebrew slot drills.
Workshop Press Tooling Part 2
Will Doggett makes a set of tooling for his press tool described starting in issue 285