Montana oil and mining journal. [volume] (Great Falls, Mont.) 1931-1953, 1939-12-30
New Year Marks Many
Remarkable Innovations
In Mining Equipment

January 1. 1910. will mark the
date of introduction for many new
products and innovations in the min
eral industry
The Chicago Pneumatic Tool Co.
is placing its new CP Diesel-driven,
two-stage air compressors on the
market. These "W-Co" stationary
units consist of a double-acting,
water-cooled compressor on a com
mon crankshaft and base with a
CP heavy-duty Diesel engine.
Rexalloy, a new tool material.
will be marketed by the CrucibIe
Steel Co. of America This is a
east. nonferrous cutting alloy and
is now offered in tool kit form
Comparative tests are basis for its
claims for exceptional long-life per-
Torrance.
The Louis Allis Co. of Milwau-
kee states that its new "Adjusto-
Speed" motor not only Incorporates
an entirely new principle in al
ternating current adjustable speed
motors, but many new advantages
and economies heretofore not
available in A c adjustable speed
units. The new motor is a combi-
nation of an eddy current clutch
and standard constant speed a.
C. squirrel cage motor. There is
no mechanical contact beween the
driving and driven members of the
unit. The speed and torque varia-
tons are obtained by controlling
the magnetic excitatiOn of the
clutch, thereby obtaining any de-
sired slip. Some of the special fea-
lures of the unit including the fol-
lowing. An unusually wide range
OF speed variation from zero to
full speed al load torque: and the
unit can be operated continually at
low speeds without overheating.
One of the latest contributions to
speedy and efficient dredge mater
ial handling IS the new and mod
arn line of walking draglines now
ing announced by the Marion
Steam Shovel Co.. Marion. Ohio.
Several of these machines are now
IN service in California gold fields
lust announced by the Stephens
AdamsOn Mfg. Co is their new
ring-type crusher, featuring trian-
gular shaped manganese steel sec
tors operating so as to crack Jumps
rather than crush them, thus min
imizing pulverization and excessive
fines. The combined Improvements
of the new triangular sector and
the use of only two gangs of sec
tors on the rotor permit handling
of larger Jumps in a given size ma
chine than was formerly possible
Ingersoll-Rand has announced a
nc ny fNk mi Fnrs Il . ff,raf srnr
jack bits which increases their life
80 to so per cent.
This hot milling machine is built
in two sizes. the JMA. which re-
dresses 10 to $50 Jackbits per
hour, and the JMB, which redress
IS rs to 80 jackbits per hour. Both
machines are equipped with cleo
tric-motor drive. The feed me-
chanism of the JMA is air-operated.
Each of these Jackmills has
single cutter which does both gaug-
ing and sharpening. The cutter of
the larger mill will redress 10000
to $4,000 bits, and the cutter of
the small mill will handle $4,000
to 10000 bits before it needs re-
sharpening. These cutters can be re-
conditioned a number of times, so
that the cutter cost per Jackbit
sharpened runs less than l mill
Another important feature is the
the fact that due to a slight flow
of metal during the milling opera
ton, 1t is possible to hold the bits
gauge size longer This increases
the life of Jackbit 80 to so per-
cent
Details covering the cost-cutting
features Of these new machines are
contained ; in an Illustrated folder,
Form 2579, copies of which are
available from the Ingersoll- Rand
Company. IL Broadway. New York
City, or any of its branch offices.