Record Power SC1 Original Instruction Manual page 32

11. General Jaw Use
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
11.5.
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 11.6 then
mount to the jaws and turn the inside surface.
Turning a Cylindrical Spigot
The diameter of the spigot should ideally allow the chuck
jaws to grip when they are almost fully closed. This gives
the greatest surface area contact and strongest grip.
Larger diameters give less contact and grip, See Fig
11.7.
Create a longer spigot for larger work to increase the
grip of the jaws.
Turn the spigot at an angle to match the inner dovetail
profile of the jaws being used as shown in Fig 11.8 then
mount to the jaws and turn the inside surface.
Kg
Warning: Never attempt to hold a spigot
between the jaw slides. The sole purpose of
the slides is to hold the chuck jaws. Only use
compatible and suitable chuck jaws to hold
workpieces.
Kg
Important: The jaws feature a small lip to the
front of the interior profile. This lip is intended
to bite into the wood to give additional security.
Do not turn a spigot to match this profile as the
effectiveness of the jaws will be reduced if the
lip cannot bite, Fig 11.8.
32
i
i
i
i
Fig 11.5
Full contact
Fig 11.6
Fig 11.7
Full contact
Fig 11.8
Contact on
extremities only
Contact on
extremities only