Bolton Tools BT1340G/1, Operation Manual, Page: 15 / 55

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handle (No.12) The carriage is anchored by turning the carriage lock in clockwise
direction.
(B) Replacement of change gears.
Open the end cover firstly, Then loose both the hexagon nut of the clamping bolt
and the clamping screw of the swing frame to exchange the transmission shaft gear
with another gear. And the change of driven gear is made by loosening the 120T and
127T gear shaft clamping nut . it is necessary for suitable backlash to intermediate the
gears in both cases .
(C) Automatic feed operation and feed change.
Firstly, operate the feed direction selector(No.3) at the headstock . Next, select a
value of feed, set the positions of 4 handles according to the feed chart. then, the feed
axis selector (No.20) is pushed out and operated upward , a longitudinal feed can be
obtained . On the contrary, if the selector (No.20) is pushed in and operated
downward, across feed will be obtained .
Feed direction can be changed by feed direction selector (No.3) at the headstock .
32 kinds of feed speeds each in longitudinal and cross feed are obtained by feed /
thread selector (No.2).
*
*ATTENTION: To avoid rotation of the
lead screw, the handle must point to the
black dot when feeding.
(D) Thread cutting operation
Thread cutting is realized by operating 4
handles(No.2) according to the thread chart, and operating the thread cutting
engagement lever (No. 19) downward . It should be engaged with leadscrew in order
to obtain the longitudinal travel of carriage, namely the thread cutting feed .
Direction of thread cutting is controlled by feed direction selector (No.3) at the
headstock . The thread pitch can be selected by the position of 4 handles(No.2).
(1) Feed table
a. Longitudinal and cross feed table in imperial lead screw .