Jet 321378, Operating Instructions And Parts Manual

Page: 11 / 56

11
7.3
Carriage
The carriage (Figure 5) is made from high-grade cast
iron. The sliding parts are smooth ground. They
fit the V on the bed without play. The lower sliding
parts can be easily and simply adjusted. The cross
slide is mounted on the carriage and moves on a
dovetail. Play in the cross slide may be adjusted
with the gibs.
Move the cross slide using the small handwheel
(Figure 5). There is a graduated collar on
the handwheel. One graduated mark equals
0.0254 millimeters or 0.001 inches.
The top slide, mounted on the cross slide, can be
rotated 360º. The top slide and the cross slide travel
in dovetailed slides and have gibs, adjustable nuts,
and graduated collars.
A four-way tool post is fitted on the top slide (Figure
6). The four-way tool post can be converted to a
single tool holder with parts enclosed in the toolbox.
See sect. 13.11.1 for assembly of tool holder.
For accurate facing operations, the carriage can
be locked by tightening the hex socket cap screw
(A, Figure 7).
7.4 Apron
The apron (Figure 8) is mounted on the bed. A half
nut is fitted to the apron. The half nut gibs can be
adjusted from the outside.
The half nut is engaged by the half nut lever.
The rack mounted on the bed, and a pinion operated
by the large handwheel on the carriage, allow for
quick travel of the apron.
Figure 8
Figure 5
Figure 6
Figure 7