The Square type is so designated on account of the palm being like a square in shape, or at least nearly so. Such a hand in fact "looks square." It is rather straight or even at the wrist, at the base of the fingers, and also at the sides. The ... Read more of The Square Type at Palm Readings.orgInformational Site Network Informational
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Steel Making

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

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Critical Points
One of the most important means of investigating the properti...

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

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

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

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

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

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

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

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

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

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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



Heat Treatment Of Lathe Planer And Similar Tools






Category: HIGH-SPEED STEEL

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
checking).





Next: Heat Treatment Of Milling Cutters Drills Reamers Etc

Previous: Lathe And Planer Tools



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