-32-
Model M1112 (For Machines Mfd. Since 12/20)
O
PE
R
ATIO
NS
Longitudinal and cross slide powered motions are
controlled by the carriage/cross feed lever. The lever
pivots through two stops that require moving the lever
left and right as well as up and down. Moving this lever
upward activates the automatic longitudinal feed. Moving
the lever downward activates the cross slide (
Figure
43).
Carriage/Cross Feed
Lever
The half-nut lever clamps and releases the half-nut, which
clamps around the leadscrew (
Figure
44). The lever is
only engaged while cutting threads.
Note:
If the apron feed lever is engaged, the half-nut
lever is blocked from use; and if the half-nut lever is
engaged the apron lever is blocked from use. If both
levers are engaged at the same time apron damage will
occur.
After the carriage has been returned, the thread dial tells
you when to re-engage the half-nut and resume threading
(
Figure
44).
When the cap screw is loosened, the thread dial housing
pivots so its gear can be engaged or disengaged from the
lead screw. When engaged, the dial will turn when the
lead screw and spindle are turning.
When the half-nut lever is engaged, the dial stops turning.
By carefully engaging the half-nut as the appropriate line
or number passes by the indicator mark, a thread can be
re-entered for its next pass of the cutter without wiping
out the previous cut.
The thread dial chart shown in
Figure
45 indicates when
to use the thread dial if inch threads are to be cut. If an
inch thread is divisible by 8, then you don't need not use
the thread dial. If cutting metric threads, you cannot use
the thread dial.
Half-Nut Lever and Inch
Threading
Figure
43
.
Carriage/cross feed lever in
neutral position.
Figure
44
.
Threading dial and half-nut
lever.
Half-nut
Lever
Dial
Cap Screw
Figure
45
.
Thread dial chart.
