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

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

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

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

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

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

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

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

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

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

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

The material used for all gears on the Liberty engine was sel...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Manganese adds considerably to the tensile strength of steel,...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Preventing Decarbonization Of Tool Steel


It is especially important to prevent decarbonization in such tools
as taps and form cutters, which must keep their shape after hardening
and which cannot be ground away on the profile. For this reason
it is well to put taps, reamers and the like into pieces of pipe
in heating them. The pipe need be closed on one end only, as the
air will not circulate readily unless there is an opening at both

Even if used in connection with a blacksmith's forge the lead bath
has an advantage for heating tools of complicated shapes, since
it is easier to heat them uniformly and they are submerged and
away from the air. The lead must be stirred frequently or the heat
is not uniform in all parts of the lead bath. Covering the lead
with powdered charcoal will largely prevent oxidization and waste
of lead.

Such a bath is good for temperatures between 620 and 1,150 deg.F. At
higher temperatures there is much waste of lead.

Next: Annealing To Relieve Internal Stresses

Previous: Steel For Chisels And Punches

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