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

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

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

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

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

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

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

Air-hardening Steels
These steels are recommended for boring, turning and planing...

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

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

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Chromium
Chromium when alloyed with steel, has the characteristic func...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

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

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...



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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