CLAUSING 5914 - Threading and Feed Operations; Threading Dial; Sequence of Engaging Controls for Threads or Feeds

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5910
CARRIAGE LOCK SCREW locks carriage to bed for
facing or cue-off operations. Caution: Be sure co re -
lease lock before moving carriage.
CARRIAGE HANDWHEEL moves carriage along the
bed manually.
CROSS FEED SLIDE AND COMPOUND REST HAND-
WHEELS move the cross slide and compound rest in
and out.
POWER FEED LEVER controls the opera-
tion of both power longirudinal feed and
power cross feed. Lever has three posi-
tions: center is disengaged (neutral for hand
feeding), co the left and down engages
power cross feeds, co the right and up
engages power longitudinal feeds.
Caution:
The power feed lever and the half - nut
lever are interlocked. Half-nuts muse be disengaged
(half-nut lever in down position) before power feeds
can be engaged.
NOTE: Cross feed is ½ of the race of longitudinal
feed.
POWER FEED LEVER
Figure 9
NEUTRAL
POSITION
HALF-NUT LEVER engages half-nuts with lead screw
for threading - - refer to figure 9.
To engage half - nuts:
1. Move power feed lever to center ( disengaged or
neutral position).
2. Move half-nut lever to up position.
NOTE: Safety lock prevents engaging feeds and half-
nuts at same time - - do not force levers.
Important: Never use half-nuts for power feeds.
Using half-nuts for threading only will maintain the
accuracy of the lead screw.
9
THREADING DIAL
The threading dial performs the important function
of indicating the proper time to engage the half-nut
lever so that tool will enter the same groove of the
thread on each successive cut.
To maintain the accuracy of the worm gear, loosen
clamp screw and swing threading dial away from lead
screw when not threading.
When cutting even-numbered thread (such as 12, 14,
16, 32, etc., per inch), engage the half-nut lever
for the first cut when the stationary mark on the
outside of the threading dial is in line with any of
the marks on rotating portion of the dial. Any dial
marking may be used for successive cuts.
When cu t ting odd-numbered thread (such as 7, 9, 11,
23, 27, etc ., per inch), engage the half-nut lever for
the first cut and all successive cuts when - the stat~on-
ary mark on the threading dial is in line with any of
the numbered marks on the dial.
When cutting half-numbered threads ( such as 4½, 5½,
6½, 11½, ere., per inch), engage the half-nut lever
at the same number on the threading dial for each cut.
The threading dial cannot be used for metric threads.
For these, the half-nut is closed on the lead screw,
and remains engaged until the thread is completed.
After each cue the tool withdrawal, the tool is brought
back to starting point by reversing the spindle.
SEQUENCE OF ENGAGING CONTROLS
FOR THREADS OR FEEDS
L Disengage power feed and half-nut levers.
2. Set quick-change mechanism:
A. Move thread-feed selector handle to the number
position indicated on chart - - refer to figure 7.
B. Position SLIDING GEAR.
C. Position SELECTOR KNOB to A, B, or C - -
engaged position is vertical.
3, Shift LEAD SCREW DIRECTION LEVER for di-
rection desired,
4. Select drive - - either dire<;c or back gear _ - accord-
i ng to spindle speed ' required .
5, Scare motor.