32
CARRIAGE
The function of the carriage is to rigidly support the cutting tool
and move it along or across the bed for turning, facing, boring
or threading operations.
POWER FEED
For longitudinal power feed pull out the CROSS/LONGITUDINAL
FEED KNOB and pull the FEED ENGAGEMENT KNOB IN THE
APRON towards you. The direction of the carriage traverse is
selected from the headstock.
For cross feed push in CROSS/LONGITUDINAL KNOB, and pull out
FEED ENGAGEMENT KNOB.
While the FEED & ENGAGEMENT SELECTOR KNOB is in out
position, the half-nut lever cannot be engaged. The built-in safety
interlock mechanism will prevent simultaneous engagement of feed
engagement knob and the half-nut lever. HALF-NUT LEVER
engages the half nuts with the leadscrew for threading. See Fig. 18,
to engage, push FEED ENGAGEMENT knob IN and engage the half-
nut lever downwards in mesh with the threads of the leadscrew.
CAUTION: DO NOT FORCE THE HALF-NUT LEVER WHILE
ENGAGING WITH THE LEAD SCREW.
THREADING DIAL
The threading dial is located on the right side of the apron. It
performs the important function of indicating the proper time to
engage the half-nut lever so that-the tool will enter the same groove
of the thread on each successive cut. The dial is marked with lines
numbered 1,2,3,4 and in between is lines with no numbers. These
are half lines and are called unnumbered lines.
The dial when engaged with the leadscrew will cause the rotation of
the dial. A single line is marked on the guard of the threading dial
(fixed line). The instruction plate riveted on the end guard shows the
selection and sequence of matching the lines the revolving lines with
the fixed line.
For thread cutting engage – the half-nuts at the appropriate numbers
shown on the scale column of the threading dial plate 1-4 on the
scale means, the half-nuts can be engaged on any of the numbered
lines 1-2-3-4 for each successive cut.
If the numbered lines are used for the first cut, for successive cuts
only numbered lines must be used 1-3, 2-4 on the scale means the
half-nuts can be engaged on 1 and 3 or 2 and 4 for successive cuts.
1-8 on the scale means the half-nuts can be engaged on any line,
numbered and unnumbered.
Fig.19
