Southbend SB1046PF - Manual (Page 58)

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For Machines Mfg. Since 3/11 Turn-Nado ® Gearhead Lathes O P E R A T I O N
Feed Selection Knob: Selects the carriage or
cross slide for power feed (see Figure 70).
When the knob is pulled out, the cross slide is
selected. Conversely, when the knob is pushed in,
the carriage is selected.
Figure 70. Apron feed selection and direction knobs.
Feed Selection
Knob
Apron Feed
Direction Knob
In the middle position, the apron gears are
disengaged from the feed rod and neither
component will move.
Note: When using this control, you may need
to rock the handwheel of the component being
engaged so that the apron gears will mesh.
Apron Feed Direction Knob: Changes power feed
direction (see Figure 70),
When pushed in or pulled out, this knob quickly
reverses the power feed direction while the
spindle is rotating—without having to turn the
lathe off and use the feed direction lever on the
headstock.
Depending on the combined configuration
of the feed direction lever on the headstock
and the feed direction knob on the apron,
the actual direction of power feed may be
different from the printed indicators on the
machine!
Carriage Feed Clutch Knob: Adjusts how easily
the carriage clutch will disengage automatic
feeding when the carriage contacts a feed stop or
in the event of a crash. Tightening this knob all
the way disables the carriage clutch completely
(see Figure 71).
The carriage clutch serves two purposes: 1) It
disengages the carriage feed when the carriage
contacts a feed stop, providing a precise
repeatable stopping point; and 2) it provides
a safety factor in the event of an accidental
overload or crash.
The correct carriage clutch setting will depend
on variables of the operation, such as workpiece
material, depth of cut, power feed rate, and
others. Finding this clutch setting is a matter of
trial-and-error and experience.
For a starting point of clutch adjustment, rotate
the carriage feed clutch knob clockwise until it is
tight, then back it off counterclockwise three full
revolutions. This is a reasonably conservative
setting to start with. If necessary, further adjust
the knob for the setting that is right for your
operation.
The carriage clutch will not stop carriage
movement when it is engaged with the
leadscrew for threading.
If the carriage feed clutch knob is completely
tight (all the way clockwise), it will be
disabled, which will not allow it to help
prevent damage in event of a crash.
Figure 71. Adjustable carriage feed clutch knob.
Carriage Feed
Clutch Knob