16
TROUBLE SHOOTING GUIDE
FAULT
REMEDY
1. Insert jams when partially
threaded into body
Check insert thread and chuck body thread are
free from damage. Check insert has engaged
with chuck body thread correctly. See ‘Fitting to
Chuck’ Page 6. Make sure grubscrew has not
been SCREWED IN.
2. Chuck body appears not
to run true
Check insert is property home in chuck body.
Check that the insert is correctly screwed onto
lathe spindle. Insert must back against
accurate face/register or bearing on lathe
spindle. See Page 2.
3. 50mm Add on jaws do not
run true
Check 50mm jaws are mounted correctly on
jaw slides, For method see Page 9. For
accuracy parameters see Page 2. When the
jaws are expanded beyond a 50mm circle they
will appear to be running out but in fact are
maintaining concentricity. Always evaluate
runout from turned wood clamped in jaws.
4. Jaw Slides closed to
centre and No. 1 Slide
stays in centre when jaws
are expanded again
Jaw slide(s) have overtravelled from scroll. It
will be necessary to tap back No.1 jaw slide
until it has re-engaged. See Page 8 for
‘insertion of jaws slides.’
5. Chuck very stiff to operate
or jammed
See notes on chuck operation Page 4. Wood
dust and shavings can clog the chuck in use.
The chuck should be disassembled and
cleaned. Follow instruction Page 4. Check
grubscrew controlling action adjustment.
6. Jaw Slides when wound to
centre do not meet
Slides have not engaged sequentially in
clockwise order with scroll - 1- 2-3-4. Jaw
slides could have been inserted out of order.
Check insertion
procedure Page 8.
7. When chuck is being
removed from spindle the
body unwinds from insert
Either lock insert in body using grubscrew and
fibre washer provided or use insert spanner on
the insert to wind chuck off lathe.
8. Chuck jams on lathe
spindle
This is a common problem with fixtures on a
lathe. To help prevent it try a plastic or fibre
washer between insert/chuck and spigot
shoulder of spindle. Greasing of insert face and
spindle can also help - Note
– Use of washer
could affect accuracy.
9. Woodworm screw creeps
forward or is not seated
properly in chuck
Make sure woodworm screw boss is placed
correctly between jaw slides and behind 50mm
jaws. See Page 9.
