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8. Operation
The SC3 and SC4 chucks are supplied with a protective
oil coating to all components to inhibit rust. Remove this
oil using white spirit or a similar de-greasing product
before use.
Some chucks feature a direct thread to their rear which
correspond with a compatible lathe. This means the
chuck can be threaded directly onto the lathe spindle
as shown in Fig 8.1, ensuring the chuck is threaded far
enough onto the spindle to allow its back face to meet
the face of the shoulder on the spindle nose. Before
fitting the chuck to the lathe, ensure the threads match.
The direct thread M33 x 3.5 and 1 1/4" x 8 TPI thread
chucks can be used on a lathe capable of reverse turning
as they feature tapped holes in the chuck bodies which
allow them to be secured by a blind set screw to the
lathe spindle. If the lathe is to be used in reverse, the
chuck must be secured to the spindle to prevent it from
coming loose during operation. When the chuck is fully
threaded onto the lathe spindle, place the protective
leather pad in the hole on the side of the chuck, thread in
the M6 x 6 blind set screw and tighten, Fig 8.2.
Kg
Warning: Only the M33 x 3.5 or 1 1/4" x 8 TPI
versions of the direct thread chucks can be used
for reverse turning. Other thread versions do
not feature a tapped hole for securing screw
and cannot be used safely if the lathe direction
is reversed.
The insert versions of the chucks must be used with an
insert to suit the lathe they are to be used on. Before use,
the insert must be fitted and secured to the rear of the
chuck body, which features an M40 x 2 pitch thread to
accept the insert.
Ensure the threads of the chuck body and insert are clean
and free from any dust or debris then carefully thread the
insert into the rear of the chuck, Fig 8.3, until the collar
of the insert is touching the chuck body and tighten
using the insert spanner, Fig 8.4.
The blind set screw supplied with the chuck must now
be used to secure the insert to the chuck body. In normal
use the chuck insert will be further tightened into the
chuck body due to the direction of the spindle's rotation.
However, if the lathe will be used in reverse, the blind set
screw ensures the insert will not come loose.
20
i
i
Fig 8.1
Fig 8.2
Blind set screw hole
Fig 8.3
Fig 8.4
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