O P E R A T I O N | For Machines Mfg. Since 3/11 |
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.
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).
Apron Feed
Direction Knob
Feed Selection
Knob
Figure 70. Apron feed selection and direction knobs.
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
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
Figure 71. Adjustable carriage feed clutch knob.
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
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.
