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Steel Making

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

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

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

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

Crankshaft
The crankshaft was the most highly stressed part of the entir...

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...

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

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

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

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

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

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

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

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...



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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