General Description And Nomenclature - Jet GH-1640ZK Operation And Maintenance Instructions

6.0 General Description and Nomenclature

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 frequency
hardening, offer precision guidance
carriage. The main drive motor is mounted in the
stand (C) below the gearbox.
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 11.0 for detailed
explanation of controls. The electrical box is
mounted to the rear of the headstock.
A 3-Jaw scroll chuck (E) and a 4-jaw independent
chuck are included.
Feed gearbox
The gearbox (F) 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
Figure 2 – General Description
for the
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 (G). 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.
Saddle (H). The saddle is made from high
quality cast iron and rides along the v-ways.
Cross Slide (I). The cross-slide is mounted on
the saddle and used for cross feed operations. It
moves on a dovetailed slide which can be
adjusted for play by means of the gibs.
Compound Rest (J). The compound rest, which
is T-slotted and mounted on the cross slide, can
be rotated 360°, allowing tapers to be turned.
The compound rest travels on dovetailed ways,
with adjustable gibs.
Four-Way Tool Post (K). The tool post is a turret
design, mounted to the compound rest. It holds up
to four tools simultaneously, and includes an
indexing function.
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