T he halved joint is frequently known as half-lapping, and sometimes as checking and half-checking. In the majority of cases it is made by halving the two pieces, i.e., by cutting half the depth of the wood away. There are, however, exceptions ... Read more of The Halved Joint at Wood Workings.caInformational Site Network Informational
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Steel Making

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Impact Tests
Impact tests are of considerable importance as an indication ...

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

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

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Although it is possible to work steels cold, to an extent de...

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

Nickel may be considered as the toughest among the non-rare a...

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

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Silicon prevents, to a large extent, defects such as gas bubb...

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Non-shrinking Oil-hardening Steels


Certain steels have a very low rate of expansion and contraction
in hardening and are very desirable for test plugs, gages, punches
and dies, for milling cutters, taps, reamers, hard steel bushings
and similar work.

It is recommended that for forging these steels it be heated slowly
and uniformly to a bright red, but not in a direct flame or blast.
Harden at a dull red heat, about 1,300 deg.F. A clean coal or coke
fire, or a good muffle-gas furnace will give best results. Fish
oil is good for quenching although in some cases warm water will
give excellent results. The steel should be kept moving in the bath
until perfectly cold. Heated and cooled in this way the steel is
very tough, takes a good cutting edge and has very little expansion
or contraction which makes it desirable for long taps where the
accuracy of lead is important.

The composition of these steels is as follows:

Per cent
Manganese 1.40 to 1.60
Carbon 0.80 to 0.90
Vanadium 0.20 to 0.25

Next: Effect Of A Small Amount Of Copper In Medium-carbon Steel

Previous: Properties Of Alloy Steels

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