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to relieve the centre so that when the recess is scraped out only half
the chisel edge needs to be used. We recommend this to reduce
tearing of the wood by scraping action; and to make the recess a little
more finished to give a better effect to the overall bowl. Extra
embellishments can also be made to the recess to enhance the bowl.
After the recess is finished and the outside of the bowl is turned to
shape, wind bowl back off screw. Bowl blank is now ready to be
reversed into the jaws. Expand the jaws into the recess. When the
jaws are expanded out into the recess, screw the wood blank gently
back and forth to make sure it is seated properly on the bottom face of
the jaws. WARNING: MAKE SURE THE JAWS ARE SEATED
PROPERLY IN THE RECESS AND THAT THE BOWL IS NOT
INCORRECTLY RIDING ON THE FLAT SHOULDER SECTION OF
THE JAWS BEHIND THE DOVETAIL. THIS COULD LEAD TO THE
BOWL DISLODGING FROM CHUCK. LOOSEN JAWS AND
REMOUNT CORRECTLY.
Now give a few gentle raps with the end of a chisel handle or wooden
mallet around centre of bowl. Use pinion handle to give an extra nip
up. Refer to chuck operation Page 4. Refer again to safety before
operation.
SPIGOT OPERATION
This is where the jaws contract around a wooden spigot for grip. This
function is mainly for box,
goblet and vase turning, that is, end grain
items with a fair degree of overhang.
This situation is one of the most
difficult to provide secure holding no matter what fixing method
is used.
EXTREME CAUTION WITH THIS OPERATION MUST BE
EXERCISED. DO NOT
EXCEED 700 RPM FOR THIS OPERATION. If
used properly the Nova Titan Chuck however,
provides a very powerful
and secure grip in this mode.
Instructions below apply to the Power
grip jaws but the general spigot technique is the same for
other jaw
types. However, maximum turning speed and recess size varies with
different jaw
types. Consult accessory jaw manual or instruction
sheets.
With the power grip jaws a maximum size wood blank of
200mm (8 inches) diameter (NOT spigot
size) by 310mm (12 inches)
length can be turned. Square timber of same length and between
60mm (2 23/64 inches) to 80mm (3 9/64inches) and grip of all four
