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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

Drop Forging Dies
The kind of steel used in the die of course influences the he...

A combination of the characteristics of nickel and the charac...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Sulphur is another impurity and high sulphur is even a greate...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

Armor plate makers sometimes use the copper ball or Siemens' ...

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

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

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

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

The Modern Hardening Room
A hardening room of today means a very different place from ...

Heat Treatment Of Lathe Planer And Similar Tools


FIRE.--For these tools a good fire is one made of hard foundry
coke, broken in small pieces, in an ordinary blacksmith forge with
a few bricks laid over the top to form a hollow fire. The bricks
should be thoroughly heated before tools are heated. Hard coal
may be used very successfully in place of hard coke and will give
a higher heat. It is very easy to give Blue Chip the proper heat
if care is used in making up the fire.

FORGING.--Heat slowly and uniformly to a good forging heat. Do
not hammer the steel after it cools below a bright red. Avoid as
much as possible heating the body of the tool, so as to retain
the natural toughness in the neck of the tool.

HARDENING.--Heat the point of the tool to an extreme white heat
(about 2,200 deg.F.) until the flux runs. This heat should be the highest
possible short of melting the point. Care should be taken to confine
the heat as near to the point as possible so as to leave the annealing
and consequent toughness in the neck of the tool and where the tool
is held in the tool post.

COOL in an air blast, the open air or in oil, depending upon the
tools or the work they are to do.

For roughing tools temper need not be drawn except for work where
the edge tends to crumble on account of being too hard.

For finishing tools draw the temper to suit the purpose for which
they are to be used.

GRIND thoroughly on dry wheel (or wet wheel if care is used to prevent

Next: Heat Treatment Of Milling Cutters Drills Reamers Etc

Previous: Lathe And Planer Tools

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