The following anecdote was told to myself, a few months after the curious event, by the three witnesses in the case. They were connections of my own, the father was a clergyman of the Anglican Church; he, his wife and their daughter, a girl of... Read more of The Girl In Pink at Scary Stories.caInformational Site Network Informational
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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

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

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

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

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

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

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 ...

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

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

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

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



Shrinking And Enlarging Work






Category: HARDENING CARBON STEEL FOR TOOLS

Steel can be shrunk or enlarged by proper heating and cooling.
Pins for forced fits can be enlarged several thousandths of an
inch by rapid heating to a dull red and quenching in water. The
theory is that the metal is expanded in heating and that the sudden
cooling sets the outer portion before the core can contract. In
dipping the piece is not held under water till cold but is dipped,
held a moment and removed. Then dipped again and again until cold.

Rings and drawing dies are also shrunk in a similar way. The rings
are slowly heated to a cherry red, slipped on a rod and rolled
in a shallow pan of water which cools only the outer edge. This
holds the outside while the inner heated portion is forced inward,
reducing the hole. This operation can be repeated a number of times
with considerable success.





Next: Tempering Round Dies

Previous: Preventing Cracks In Hardening



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