EXTERNAL JAWS FOR 3-JAW CHUCK
To change the jaws, insert the chuck key and open the jaws
to their fullest extent, it will then be possible to remove each
jaw in turn.
Replace them with the external jaws, noting the following.
The tread segments of the jaws are progressively “step-ped”
as shown in fig. 14. They are also numbered 1 to 3. This is
to take into account the lead of the screw thread within the
chuck. It is therefore necessary to assemble the jaws in the
correct order.
Place them as shown in the fig. 14 and assembly in the same
order, clockwise in the slots in the chuck, turning the chuck
key as you insert them. Close the jaws fully and check to
ensure they all meet at the center. If a jaw is out, open the
jaws fully, and retain pressure on the jaw in question while
turning the chuck key until it snaps down into positon. Re-
check to ensure all jaws meet at the center.
FIXED AND MOVING STEADIES
12
ment is too stiff, screw “out” the adjusters by one eight of
a turn until the correct adjustment is attained.
5. Tighten all lock nuts. Take care you do not move the jib
screws while doing so.
6. When finished, retract the side fully and apply oil to all
mating surfaces and the feed screw thread. Then crank
the slide back to its normal position.
B. CROSS-SLIDE HANDLE
The cross-slide feed should run smoothly, and the scale must
rotate with the handle.
If any stiffness occurs, it is probably the result of chips or
other lodging between the mating surfaces. Undo the socket
head screw which secures the handle. Remove the handle
and pull off the collar with the scale taking great care to
retain the small spring plate which sits in a groove beneath
the collar.
Clean the assembly and reassembly in reverse order. It will
be necessary to hold the spring plate in place with a small
screwdriver, or similar tool, and pushing down on it to allow
the collar to be correctly located on to the shaft.
C. COMPOUND SLIDE ADJUSTMENTS
Compound slide adjustments are made in the same way as
those for the cross-slide. The jib screws are to be found on
the left hand side of the slide. I.e. facing the front of the
lathe.
NOTE:
It is important that the cross-slide and compound slide
adjustments are correctly carried out and that there is “no
sloppiness” of action. Any misadjustments will have a
serious effect on the quality of your work, as they will all be
transferred to the tool tip, it is vital that there is as little
movement of the tool as possible.
ACCESSORIES
A complete range of accessories is available from your ver-
satility of your machine.
Fig. 15, illustrates the Fixed Steady (A) and Moving steady
(B) assembled to the lathe used to support a long work
piece.
HOW TO USE A THREAD DIAL INDICATOR
(optional accessories)
Mounted on the Apron, adjacent to the Auto Feed lever, is
the Thread Dial indicator, shown in fig. 15. This is perman-
ently connected to the lead screw and, as the lead screws
and, as the lead screw turns, the “dial” spins. Eight radial
marks are etched on the dial and these are used t determine
the exact position of the lead screw thread in relation to the
saddle.
