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6.0 General description and nomenclature
Figure 2 – General Description (GH-2680ZH shown)
The ZH series lathe operates on a centralized gear
system. The motor power is transferred through
four v-belts to a shaft, which in turn transmits the
energy through a multi-disc friction clutch and
various gear pairs, to the spindle. The clutch also
controls the spindle’s direction of rotation. Through
clutch disengagement, the operator can stop the
spindle without turning off the motor, which will
prolong the life of the motor.
Bed and Stand
The lathe bed (A) is made of cast iron with low
vibration and high rigidity. Two precision-ground v-
slideways (B), reinforced by supersonic fre-quency
hardening, offer precision guidance for the
carriage. The main drive motor is mounted in the
stand (C) below the gearbox.
(The GH-26120ZH model has three stands: left,
center, and right).
Headstock
The headstock (D) is cast from high grade, low
vibration cast iron. In the head, the spindle is
supported at three points; by a cylindrical roller
bearing at the front and a tapered roller bearing
and ball bearing. See section 11.0for detailed
explanation of controls. The electrical box is
mounted to the rear of the headstock.
Feed Gearbox
The gearbox (E) is made from high quality cast iron
and is mounted to the left side of the machine bed.
This lathe adopts a three-axle sliding common gear
mechanism, together with thread selection change
mechanism, and doubling mechanism, which
enable it to cut a comprehensive range of metric,
modular and diametral pitch threads, thus
eliminating the need for gear changes except
where special threading is required.
Carriage
The carriage assembly is composed of the Apron,
the Saddle, the Cross Slide, the Compound Rest,
and the four-way Tool Post.
Apron (F).Quick travel of the Apron for
positioning is accomplished by means of a bed-
mounted rack and pinion, operated manually by
the handwheel on the front of the apron, or
automatically by the feed direction handle (P),
which has a rapid traverse (Q).
Saddle (G). The saddle is made from high
quality cast iron and rides along the v-ways.
Cross Slide (H). The cross-slide is mounted on
the saddle and used for cross feed operations.It
moves on a dovetailed slidewhich can be
adjusted for play by means of the gibs.
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