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Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

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

Hardening
The forgings can be hardened by cooling in still air or quen...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

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

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

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

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

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...



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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