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Steel Making

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Conclusions
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Molybdenum
Molybdenum steels have been made commercially for twenty-five...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Sulphur
SULPHUR is another element (symbol S) which is always found i...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Chromium
Chromium when alloyed with steel, has the characteristic func...

Annealing
ANNEALING can be done by heating to temperatures ranging from...



Hardening Carbon Steel For Tools






Category: HARDENING CARBON STEEL FOR TOOLS

For years the toolmaker had full sway in regard to make of steel
wanted for shop tools, he generally made his own designs, hardened,
tempered, ground and usually set up the machine where it was to
be used and tested it.

Most of us remember the toolmaker during the sewing machine period
when interchangeable tools were beginning to find their way; rather
cautiously at first. The bicycle era was the real beginning of
tool making from a manufacturing standpoint, when interchangeable
tools for rapid production were called for and toolmakers were in
great demand. Even then, jigs, and fixtures were of the toolmaker's
own design, who practically built every part of it from start to
finish.

The old way, however, had to be changed. Instead of the toolmaker
starting his work from cutting off the stock in the old hack saw,
a place for cutting off stock was provided. If, for instance, a
forming tool was wanted, the toolmaker was given the master tool
to make while an apprentice roughed out the cutter. The toolmaker,
however, reserved the hardening process for himself. That was one
of the particular operations that the old toolmaker refused to
give up. It seemed preposterous to think for a minute that any
one else could possibly do that particular job without spoiling
the tools, or at least warp it out of shape (most of us did not
grind holes in cutters 15 to 20 years ago); or a hundred or more
things might happen unless the toolmaker did his own hardening
and tempering.

That so many remarkably good tools were made at that time is still
a wonder to many, when we consider that the large shop had from 30
to 40 different men, all using their own secret compounds, heating
to suit eyesight, no matter if the day was bright or dark, and then
tempering to color. But the day of the old toolmaker has changed.
Now a tool is designed by a tool designer, O.K.'d, and then a print
goes to the foreman of the tool department, who specifies the size
and gets the steel from the cutting-off department. After finishing
the machine work it goes to the hardening room, and this is the
problem we shall now take up in detail.





Next: The Modern Hardening Room

Previous: Restoring Overheated Steel



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