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Steel Making

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

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...

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

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...



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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