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An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Quenching
It is considered good practice to quench alloy steels from th...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Annealing Work
With the exception of several of the higher types of alloy s...

Hardening
Steel is hardened by quenching from above the upper critical....

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

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...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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

Furnace Data
In order to give definite information concerning furnaces, fu...

Quenching The Work
In some operations case-hardened work is quenched from the bo...



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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