CHESTER LAB12VS Operation Manual page 8

GENERAL DESCRIPTION
Lathe Bed (Fig. 03)
The lathe bed is made of high-grade iron. By combining
high cheeks with strong cross ribs, a bed of low vibration
and rigidity is produced. It integrates the headstock and
drive unit, for attaching the carriage and leadscrew. The
two precision-ground V - sideways, re-enforced by heat
hardening and grinding, are the accurate guide for the
carriage and tailstock. The main motor is mounted to the
rear of the left side of the bed.
Headstock (Fig. 04)
The headstock is cast from high grade, low vibration cast
iron. It is bolted to the bed with four screws. The headstock
houses the main spindle with two precision taper roller
bearings and the drive unit.
The main spindle transmits the torque during the turning
process. It also holds the workpieces and clamping
devices, (e.g. 3-jaw chuck).
Gear Box (Fig. 05)
The gear box is made from high quality cast iron and is
mounted on the left side of the machine bed. It used to
select the feeds for straight turning as well as for thread
cutting. In order to achieve certain thread pitches, it is
necessary to replace the change gears.
The torque of the work spindle is transmitted to the feed
gear and thus to the leadscrew.
Carriage (Fig. 06)
The carriage is made from high quality cast iron. The slide
parts are smoothly ground. They fit the V on the bed
without play. The lower sliding parts can be easily and
simply adjusted. The cross slide is mounted on the
carriage and moves on a dove tailed slide. Play in the
cross slide may be adjusted with the gibs.
Move the cross slide with its conveniently positioned
handwheel. There is a graduated collar on the handwheel.
The top slide, mounted on the cross slide, can be rotated
360°. The top slide and the cross slide travel in dove tailed
slides and have gibs, adjustable nuts, and graduated
collars.
A four way tool post is fitted on the top slide and allows
four tools to be clamped. Loosen the center clamp handle
to rotate any of the four tools into position.
Fig. 03
Fig. 04
Fig. 05
Fig.06
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