5
Using the Deep Wood Screw
The
62833
Deep Wood Screw supplied with
the SC3 and SC4 chucks is designed to be
held by the following jaws:
62321
35 mm Standard Jaws
62313
50 mm Standard Jaws
62317
130 mm Dovetail Jaws
The
62832
Long Deep Wood Screw is designed to be held by the following
jaws:
62329
100 mm Dovetail and Deep Gripper Jaws
62322
75 mm Heavy Bowl and Gripper Jaws
See
Fig 3.1
.
Ensure that the flattened areas of the deep wood screw collar are positioned
to mate with the jaw slides as shown in
Fig 3.2
and tighten the jaws around
the screw.
Find the centre point of the workpiece and drill a 7 mm (
9
⁄
32
”) for soft wood
or 8 mm (
5
⁄
16
”) wide hole in the centre point, and to a depth of 17 mm (
6
⁄
10
”).
Screw the workpiece onto the deep wood screw until it meets the jaws as
shown in the cross section of
Fig 3.1
.
The outside of the bowl can now be turned as shown in
Fig 3.3
.
Warning: Only use the deep wood screw for workpieces up to
250 mm (10”) in diameter and 100 mm (4”) in depth, Fig 3.1.
Turn either a recess or a spigot on the base of the bowl. This will be used to
hold the chuck in the jaws to allow turning of the inside.
Turning a Recess
The diameter of the recess should ideally allow the chuck jaws to open
slightly from their fully closed position. This gives the greatest surface area
contact and strongest grip. Larger diameters give less contact and grip, see
Fig 3.4
.
Create a deeper recess for larger work to increase the grip of the jaws.
Turn the recess at an angle to match the outside dovetail profile of the jaws
being used as shown in
Fig 3.5
then mount to the jaws and turn the
inside surface.
Fig 3.3
Fig 3.2
Deep wood screw
Rear
Fig 3.1
Max.
100 mm depth
Max.
250 mm width
i
Kg
i
Kg
Fig 3.4
Full contact
Contact on
extremities only
3. General Jaw Use
Fig 3.5