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14
1340-1440 Lathe
Threads available:
• 37 Metric threads - 0.5 to 7.0mm pitch
• 40 STD. threads - 4 to 112 T.P.I.
The endgear train should be arranged as in the diagrams
shown on the data plate to suit threading requirements.
Feed rates: The Cross feed rate is 50% of Longitudinal
feed that is shown on headstock.
Feeds: longitudinal feeds per spindle revolution range from
0.053 to 0.402mm.
Cross feeds per spindle revolution range from 0.026 to
0.201mm.
Fig. 16
Y
7.5 THREADING DIAL INDICATOR
STD. threads
Located on the right hand side of the apron on lathes hav-
ing an English leadscrew. Engage the indicator pinion with
the leadscrew and tighten the handnut to retain indicator in
engagement. To cut threads of an even number per inch,
close the leadscrew nut as ANY line on the dial passes the
datum mark. To cut threads of odd numbers per inch, close
the leadscrew nut at any NUMBERED line.
Fractional threads of 1/2 or 1/4 t.p.i. may be cut by closing
the nut at the SAME numbered line on each pass of the
tool.
This dial cannot be used with an English leadscrew to cut
metric threads, or fractional threads. For these the lead-
screw nut must be kept closed and the machine reversed
by use of the changeover switch, after each cutting pass
and tool withdrawal.
Fig. 17
Handnut
Threading dial indicator
7.6 APRON CONTROLS (LEVER TYPE)
In addition to handwheel traverse, the carriage can be
power-operated through controls on the front of the apron,
see Figure 16 knob (A). Automatic feed lever (A) if moved
upwards, the carriage will do longitudinal-feed operation.
If the lever (A) is placed in middle position, it will perform
manual operation. If the lever (A) is moved downward, it
will perform the cross-feed operation.
Lever (B) is pressed downward to engage the leadscrew
nut for threading. To avoid undue wear, release the nut
except when threading.
Fig. 18
A
B
7.7 CROSS SLIDE AND TOP SLIDE
A solid topslide is fitted as standard to the cross-slide. Car-
ried on a rotatable base the cross-slide is marked 45-0-45
degrees for accurate indexing.
Handwheel dials are graduated in inch or metric division to
suit the operating screw and nut fitted.
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