Southbend SB1027 owner manual Using the Auto-Downfeed System, To use the auto-downfeed system

Model SB1027 O P E R A T I O N For Machines Mfg. Since 8/09

Using the Auto-Downfeed System

When using the auto-downfeed system, the spindle will move in the direction you choose with the auto-downfeed direction pin. When the quill dog reaches the top or meets the downfeed stop, the downfeed clutch lever releases. Then, if the spindle was traveling upward, the movement simply stops. If the spindle was traveling downward, then the spindle moves back to the top at a rate controlled by the return spring on the left side of the head.

To use the auto-downfeed system:

1.Make sure that the spindle rotation is turned OFF and the spindle is at a complete stop.

2.To set the mill for auto-downfeed, pull the downfeed selector knob out, then rotate the selector clockwise and seat the pin in the rear auto-downfeed (engaged) position, as illustrated in Figure 40.

Auto-Downfeed (Engaged) Position

Figure 40. Downfeed selector in the auto-downfeed

(engaged) position.

3.Position the downfeed stop for the spindle depth that is correct for your operation, then secure it in place with the locking wheel.

4.Position the auto-downfeed direction pin for the spindle travel that is correct for your operation. It may be necessary to rock the fine downfeed handwheel back-and-forth to move the pin all the way in or out.

Note: The direction pin has three positions: 1) In for one downfeed direction, 2) middle for neutral or no movement, and 3) out for the reverse direction. The direction of spindle travel for the in and out positions is relative to the direction of spindle rotation. Keep in mind that spindle rotation and downfeed direction will reverse when the spindle speed range is changed.

5.Make sure the clutch lever is all the way to the right in the disengaged position so that the spindle will not travel when rotation is started.

Note: We recommend that you complete the remaining steps without a cutting tool installed, without a workpiece in place, and the table lower than the maximum spindle downfeed travel. This will enable you to test and confirm the settings before beginning the actual cutting operation.

To avoid damage to the system gearing, never use the auto-downfeed system with spindle speeds over 3000 RPM.

6.Set the mill for the correct spindle speed, then begin spindle rotation.

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