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3. Wind the mounted jaws into the centre of the chuck until they all
butt against the other. Now finally tighten screws, starting with
centre screws and then outside screws. Nip screws up firmly but
DO NOT OVER TIGHTEN.
4. Check there is no light between jaw slides and add on jaw
segments or that one or more segments is not higher or lower
than the rest. If this is the case repeat procedure above.
OPERATING MODES
SCREW CHUCK
: This is a convenient mounting method. The
PowerGrip Woodworm screw is purpose-designed for screw chucking.
It is a cylindrical screw which maintains its full holding power along the
whole length, unlike normal tapered screws. The thin thread form is
specially designed to cause minimum damage to wood fibres. They
grip better than screws with thicker threads because there is a larger
volume of undamaged wood retained within the screw.The woodworm
screw is made complete with the boss section in one piece. The
woodworm screw is designed to be used with the powergrip jaws
remaining in place on the chuck. This facility is very convenient for
remounting work directly onto the jaws after the screw is removed. To
convert to this operation, place the boss section into the centre of the
chuck making sure flat shanks are aligned to the jaw slides and close
jaws around it. BEFORE FINAL TIGHTENING MAKE SURE THAT
THE FRONT OF THE BOSS SECTION OF THE SCREW IS SEATED
BEHIND AND AGAINST THE POWERGRIP JAWS. This will prevent
any tendency for the boss section to creep forward when the screw is
being used. The front face of the PowerGrip Jaws has been machined
to provide an accurate backing surface. This is quite an advantage,
providing a much tighter fit and better tolerance for irregular face stock.
This feature is also quite an advantage when using the screw to mount
a bowl for first stage bowl turning - forming the outside of the bowl
straight onto the jaws (the screw is first removed) after the recess has
been formed.
