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Depression and Growth

1928–1938

Weathering

the Storm

Crowd gathering on Wall
Street after the 1929 crash.
®
While many businesses fall victim to In the late 1930s, the Zerol Bevel
the Great Depression in 1929, The Gear System is widely employed
Gleason Works not only weathers the for applications in which hardened
crisis, it continues to grow. gears of high accuracies are required,
especially in the aircraft industry.
The development of new ideas does
not cease because of the Depression.
In 1931, work begins to develop
machines and methods for grinding
spiral bevel and hypoid gears and the
first grinding machines are available
by 1938.

No. 27 Hypoid Seversky P-35, revolutionary low-wing
Grinder for Zerol Bevel Gears, monoplane with enclosed cockpit and
vital to aircraft gear production. retractable landing gear.

Revacycle Process for
Differential Cutting

The Revacycle process
®
performs a non-generated form
cutting of the tooth profiles. The
broach cutter moves from toe to
heel during the roughing portion
of the cycle and then back to the
toe in a climb cutting mode in
order to finish the flank surfaces
and generate a straight root line.

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