8
Select a cutting tool that will produce the desired cut and
mount it in the Tool Rest with as little overhang as possible.
Securing it with the three socket head cap screws in the
manner shown in fig. 6. (Ideally, the overhang should be
approx. 10 mm but not more than 15 mm for a straight tool).
It is IMPORTANT to ensure that the tip of the cutting tool is
on the horizontal center line of the work, or very slightly
below it. On no account should it be above the center line.
When necessary, shims should be used beneath the tool in
order to achieve the correct height. Or, if the tip is too high,
the only recourse is to select another tool or grind down the
tip.
To check take the tip is at the correct height, position the tool
so that the tip coincides with the point of the tailstock cen-
ter. If necessary, make adjustments using shims, grind down
the cutting tool tip, or select another tool.
When satisfied, mount the work either in the chuck or on a
faceplate. And, if necessary, use the tailstock center for addi-
tional support if the work cannot be adequately secured by
the chuck, or if it is a long place or of small diameter.
Additionally, “Steadies” or rests may be used, which are
described in greater detail under “Accessories”. If the
Tailstock is not to be used, you may remove it completely by
slackening off the securing nut at its bade and sliding it free
of the bed.
It may be necessary to adjust the position of the compound
slide or reposition the work in the chuck to guarantee that
there is adequate clearance.
When satisfied, retract the cutting tool and crank the carria-
ge / saddle away from the headstock, then crank the cutting
tool up to the work along the length to be cut while rotating
the work by hand using the chuck.
Continue to advance the cutting tool slowly until it just tou-
ches the surface. Record this position by zeroing the scale
on the cross-slide, i.e. turn the moveable scale until the zero
marks coincide, see diagram opposite.
Once zeroed, retract the cross-slide one complete turn, then
move the carriage / saddle until the tool is a short distance
from the right hand edge of the work. Crank in the cross-
slide again one full turn until the zero marks again coincide.
IMPORTANT:
If you go past the zero marks, back off
again at least one half of a turn, then slowly bring the marks
back together. Whenever you use the scale, as an indicator,
to advance the cross-slide or compound slide, ALWAYS use
this procedure to align the mark. This is to take up any back-
lash or other clearances in the gearing and slides etc.
Continue to turn the handle an amount equivalent to your
desired depth of cut.
NOTE: We recommend that for rough cutting, you do
mot exceed 0.010” (0.25 mm) as your depth of cut.
The setup is now complete to begin your cutting operation,
but, before starting, check the position of:
a. Auto feed lever. Ensure it is in the UP position for manu-
al feed.
b. Forward / Neutral / Reverse lead screw lever. If Auto
feed is not required, set to “Neutral”.
c. HIG / LOW lever. Select required speed range.
Switch the machine ON as described under “Starting
Procedure” and slowly feed the cutting tool into the work
using the Manual Feed handle. Proceed until you reach the
previously marked line on the work, then retract the tool one
or two complete turns on the Cross-Slide feed handle. Crank
the carriage / saddle back to the beginning, then crank the
tool the same number of turns “in”, plus the depth of desired
cut, and proceed to cut once more.
NOTE:
This describes the procedure for general, rough
cutting. For other types of cuts / finishing... cut-ting shoul-
ders, etc... you should consult a suitable handbook.
B. SIMPLE TURNING WITH POWER FEED
The same basic setup is used as described above, except
that, before starting, the lead screw F/N/R Lever (25, on the
rear of head stock) is set to the “Forward” position and the
Auto feed Lever (13), is operated in order to drive the carr-
riage / saddle. As mentioned previously, the rotational speed
of the lead screw, and hence the rate of feed of the tool, is
dependent upon the gear configuration of the gear train. The
feed rate for normal turning is considerably less than that
used for screw cutting.
The lathe is factory-configured for normal turning; however,
if you have been screw cutting, always remember to reset
the gear configuration to that for normal turning. Please
refer to the chart on later page which shows the gear confi-
guration, and the explanation of how to change the gears.
1. Take all precuations previously mentioned, position the
cutting tool a short distance to the right of the work piece
with the appropriate depth of cut set on the cross-slide.
2. Ensure the lead screw F/N/R lever is set to “Forward”
and select “Forward on the Forward/Off/ Reverse switch
on the main control panel. Switch on the machine.
3. Turn the knob to achieve your desired spindle speed with
your right hand and push down on the auto feed lever
until the nut becomes firmly engaged with the lead screw.
IMPORTANT: Your left hand should always be free in order
to hit the emergency stop should it become necessary.
4. Carefully observe the movement of the tool and as it
approaches the mark on the surface (denoting the end of
cut), pull the Auto Lever UP sharply and ensure it stays
UP. If a degree of accuracy is required, it is recommen-
ded that you finish the cut by hand.
