26
Figure 46 – Speed control chain adjustment
13.11 Lead Screw
To ensure the pitch accuracy in cutting threads,
any axial run-out of the lead screw must be
eliminated. See Figure 47. This is achieved by
adjusting the thrust bearings (2 and 3) using the
nut (1).
Figure 47 – Lead screw runout adjustment
13.12 Apron Feed Clutch
The feed transmission begins with the feed rod to
the apron, through feed clutch to worm, through the
gear drives, to longitudinal or cross movement.
The worm axle is equipped with an overstep clutch
to provide rapid feed for the carriage. When the
rapid feed motor drives the worm axle, it oversteps
the feed rod in one direction.
The carriage (longitudinal feed) handwheel is
automatically disengaged when the carriage is in
rapid feed or longitudinal automatic feed. When the
feed movements stop, the handwheel will
reengage.
If the cutting force will not reach rated maximum
value, remove the cap and adjust the clutch using
the adjusting screw (see Figure 48).
Do not over tighten the feed
clutch. Over tightening may nullify the
protective feature and can damage the lathe.
To avoid feed rod and lead screw engaging at the
same time, an interlocking mechanism is situated
between longitudinal feed axle and half nut
operation axle.
Figure 48 – Feed clutch adjustment
13.13 Tool Post
Tool holder (2) is positioned to the tool post body
(1) through a dovetail groove and its center height
can be adjusted by sliding the dovetail along the
groove and turning screw (5).
The tool holder can be fixed by turning lever (7)
and the middle bolt will drive the wedge block (4)
downward for clamping the tool holder.
The whole tool post can be fixed by the top nut (6).
Tool shank can be fixed to the tool holder by its
screw (3) (see Figure 49).
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