An efficiency expert concluded his lecture with a note of caution. "You need to be careful about trying these techniques at home." "Why?" asked somebody from the audience. "I watched my wife's routine at dinner for years," the expert explai... Read more of Expert in the kitchen at Free Jokes.caInformational Site Network Informational
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Steel Making

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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Machineability
Reheating for machine ability was done at 100 deg. less than ...

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

Silicon
SILICON is a very widespread element (symbol Si), being an es...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

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



Preparing Parts For Local Case-hardening






Category: CASE-HARDENING OR SURFACE-CARBURIZING

At the works of the Dayton Engineering Laboratories Company, Dayton,
Ohio, they have a large quantity of small shafts, Fig. 40, that
are to be case-hardened at A while the ends B and C are to
be left soft. Formerly, the part A was brush-coated with melted
paraffin but, as there were many shafts, this was tedious and great
care was necessary to avoid getting paraffin where it was not wanted.



To insure uniform coating the device shown in Fig. 41 was made.
Melted paraffin is poured in the well A and kept liquid by setting
the device on a hot plate, the paraffin being kept high enough
to touch the bottoms of the rollers. The shaft to be coated is
laid between the rollers with one end against the gage B, when
a turn or two of the crank C will cause it to be evenly coated.





Next: The Penetration Of Carbon

Previous: Preventing Carburizing By Copper-plating



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