SCREW CHUCK - WOODWORM SCREW
The woodworm screw (screw chuck) provides a convenient method for holding a bowl blank
to cut a recess to mount on the P
RO
-T
EK G3
50mm (2in) jaws.
Jaws must be mounted on the chuck before the wood worm screw – See diagram
Open the jaw slide and insert the wood
worm screw in the centre hole of the
chuck.
Position the woodworm screw as shown
in illustration.
Note:
All 4 flat sides of the wood worm
screw should be in contact with the flat
end of the jaw slides.
The wood worm screw is used to secure the wood to
cut either a recess or spigot on the open ‘face’ end.
Pre-drill a hole of size 8mm (5/16in) diameter with
19mm (3/4in) depth to mount the blank using the
woodworm screw. The wood must be seated firmly and
flat against the top surface of the mounted jaws. For
first stage rounding of bowl blanks; extra support can
be used with live centre support from the lathe
tailstock. See full manual online for more details.
DO NOT USE WOOD BLANKS LARGER THAN 250mm
DIAMETER X 100mm DEPTH (10inx4in)
DO NOT EXCEED 600RPM
TURNING ON A SPIGOT OR DOVETAIL
Spigot is where the jaw contracts onto the workpiece to grip.
This is mainly for box, goblet and vase turning (End grain items
with a fair degree of overhang).
EXTREME CAUTION WITH THIS OPERATION MUST BE
EXERCISED. DO NOT EXCEED 850 RPM FOR THIS OPERATION.
Spigot Diameter (For 50mm Jaws)
Min Diameter
Max Diameter
Cylinder
45mm (1 3/4in)
65mm (2 9/16in)
Square
40mm (1 9/16in)
50mm (2in)
Dovetail is where the jaw expands into a recess of a workpiece
to grip. This operation is mainly for bowl and platter (Items with
parallel wood grain).
MUST NOT BE USED FOR ANY LONG WORK (OVER 100mm or
4 inches). DO NOT EXCEED 600RPM WITH THIS OPERATION.
OUT OF BALANCE STOCK MUST BE TURNED AT THE SLOWEST
SPEED POSSIBLE.
Recess Dovetail Diameter (For 50mm Jaws)
Min
Max
50mm (2in)
70mm (2 3/4in)
FORMING A SPIGOT OR RECESS
Recess
Spigot
Using a Nova Dovetail Chisel #6008 (or any
other suitable tool), cut into the wood, rest the
flat side of the chisel on the bottom surface of
the recess to form a profile of between
75~80deg with 10mm (25/64in) depth.
Using a suitable chisel, turn the outer
diameter of the wood to form the spigot. The
length of the spigot should match the internal
height of the jaws.
CO
NT
ACT
●
Te
kn
atool
Int
ern
ation
al L
td
P
hon
e: (
+64)
9
477
560
0
●
Te
kn
atool
U
SA
P
hon
e: 7
27
-954
-34
33
CUST
OM
ER
SO
LUT
IO
NS
Fo
r a
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orl
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ust
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rit
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m
ail
:
Or
y
ou
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ont
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the
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tail
er w
he
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our
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OV
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co
nt
act
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tail
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ite
NEW
A
ND
IM
PR
OV
ED
FEA
TU
RE
S
•
Rust
resistant nickel
-p
late
d
body
for
longer
pr
otection an
d
less
maintenance
.
•
Stronger and
m
ore
versati
le
P
RO
-T
EK
5
0mm
(2in)
Jaws.
D
ovetail
a
nd
serrated internal
profil
e f
or
m
aximum
holding
po
wer
.
•
Ri
ght
hand,
standard clockwise
scroll
tightening
for
e
ase
o
f use
.
•
Easier
to
read,
laser
e
tched numberi
ng
o
n
edge
o
f P
RO
-T
EK
5
0mm
(2in)
jaws
.
•
Fa
ste
ne
r u
pg
ra
de
to
No
va
S
tar
he
ad j
aw s
cre
ws
. No
-sli
p s
tar
he
ad
fo
r p
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e T
-ba
r ha
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e lo
ca
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nd b
ett
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ight
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ng
po
we
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tar
pr
ofil
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ini
m
ize
str
ip o
ut
of
scr
ew he
ads
•
No
va
S
tar
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T-ba
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and
le f
or e
asy
gr
ip
and
qui
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ight
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ing
o
f
sc
re
w
s
•
Slid
in
g T
-ba
r C
huc
k s
cro
ll k
ey
to
e
na
bl
e e
asi
er j
aw o
pe
rat
ion
.
De
sig
ne
d a
nd
m
an
ufa
ctu
red
b
y
Te
kn
ato
ol I
nte
rn
atio
na
l, U
SA
a
nd
PR
C ©
2
02
0 T
ek
na
to
ol
nova
TM
PRO
-T
EK
G3
CHUCK
REF#
QTY.
PART#
DESCRIPTION
1
1
48206, 48239, 1359011
PRO-TEK G3
Body
2
1
1359010
Pinion T-Handle
3
1
23109
Scroll ring right hand
4
1
23051, 23051E
Jawslide #1
5
1
23052
Jawslide #2
6
1
23053
Jawslide #3
7
1
23054
Jawslide #4
8
1
EC48, EC50
Circlip
9
1
NS1000
Fibre (Washer) WAD
10
1
G0606
Grub Screw
11
8
CM5010182
NOVA Star head screws -
C/Sunk
12
1
10006
Woodworm screws
13
1
13049
Star head screw T-handle
14
1
AK3
Allen Key 3mm
15
1
6075
P
RO
-T
EK
50mm (2in) Jaws
ACCURACY
The P
RO
-T
EK
Chucks are sample tested from each batch
and are made to run within the following tolerance limits
on the P
RO
-T
EK
50mm (2in) jaws:
-
Maximum Face/Axial Runout: 0.08mm (0.0031 in)
-
Maximum Radial Runout: 0.15mm (0.0060 in)
However, wood is a flexible material with varying densities
and liable to warp while turning.
Under these circumstances pursuing accuracies as above,
measured on the wood project clamped in the chuck, can be
very difficult to achieve. For most wood turning projects
there is usually little requirement to achieve such tolerances.
See trouble shooting guide for detailed guide on accuracy
in full P
RO
-T
EK
manual online at
WARRANTY
Your Nova P
RO
-T
EK
Chuck is covered by a 6-year Limited Warranty. Go to
for a full warranty statement in full version manual P
RO
-T
EK
G3
Chuck. The full online manual also covers trouble shooting, maintenance, list of Nova lathe spindle thread inserts, jaw and chuck accessories.
Opt
ion
al A
cce
sso
ry J
aws
Chuc
k i
s c
om
pa
tibl
e wi
th a
ll no
va
ja
ws
inc
ludi
ng
the
ja
ws
sho
wn a
bo
ve
.
No
te:
Ex
clu
din
g j
aw
s th
at a
re
sp
ec
ific
fo
r N
ov
a
Tit
an c
huc
ks
Make sure this flat face is
coming in contact with the
tip of the jaw slide
Side to cut
recess or
spigot
Ch
uc
k
Gr
ip
pi
ng
Di
rec
tio
n
(S
pi
go
t)
Ch
uc
k
Gr
ip
pi
ng
Di
rec
tio
n
(D
ov
et
ai
l)
Do
w
nl
oa
d t
he
N
OV
A A
pp!
