19
B. SIMPLE TURNING WITH POWER FEED
The same basic setup is used as for simple turning, except that, before starting,
the 2-Speed Lever is set to either 1 or 2 in order to provide the desired feed rate.
CAUTION: NEVER attempt to change speeds whilst the machine is operating.
As mentioned previously, the rotational speed of the leadscrew, and hence
the rate of feed of the tool, is dependant upon the gear train configuration.
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 page 21 which shows the gear
configurations, together with an explanation of how to change gears.
1. With the cutting tool at right angles to the workpiece, wind the cross-slide
so that the cutting tool tip JUST touches the work surface.
2. Hold the cross-slide handle still whilst turning the scale so that it registers
zero, then, using the saddle feed handle. Move the cutting tool so that it is
somewhere to the right of the work
3. Advance the cutting tool, using the cross-slide handle, the requisite number of
graduations to produce the desired depth of cut. 1 graduation = 0.001 inches.
4. Taking all precautions previously mentioned and ensuring there are no
potential obstacles to the rotating workpiece, switch the machine ON
5. Engage the auto feed by moving the lever towards the 12 o’clock position.
At this point the cutting tool will begin its travel towards the chuck - be
ready to disengage the auto feed quickly by knocking the lever firmly to
the 3 o’clock position.
NOTE: Always stop short of an intended shoulder - which should always be finished
manually, by switching the machine OFF. If you require a shoulder with perfectly
clean corners, then you need to use an appropriately shaped tool.
6. Retract the tool by one or two complete turns on the cross-slide feed, then
wind the saddle so that the tool is at the start point once again.
Advance the tool to its original position, using the scale, then advance it
further by the required depth of cut. When ready, re-engage the auto feed
and proceed to take another cut.
NOTE: You may notice considerable backlash on the screw threads, this is quite
normal and should not cause alarm.
C. BEVEL CUTTING Re: Fig. 19
Bevel cutting involves the use of the compound slide, which is mounted on the
cross-slide and set at right angles to it for all normal cutting operations. This is
indicated by the zero mark, on the scale, lining up with the mark etched on the
body of the cross-slide.
To set the compound slide so that the cutting tool will cut a bevel, slacken the
two screws, securing the compound slide to the cross slide, sufficient to allow
the compound slide to be turned to the desired angle, as indicated on the
scale. Secure the slide in this position by re-tightening the securing screws.
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