Grizzly g0747, g0748 owner manual Auto-Downfeed, To use the auto-downfeed

Auto-Downfeed

When using the auto-downfeed system, the spin- dle 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 will release. Then, if the spindle was traveling upward, the movement will simply stop. If the spindle was traveling down- ward, then the spindle will move back to the top at a rate controlled by the return spring on the left side of the head.

To use the auto-downfeed:

1.Make sure the spindle is completely stopped.

2.pull the downfeed selector knob out, then rotate it clockwise until the knob pin seats in the auto-downfeed (engaged) detent (see Figure 37).

Note: It may be necessary to turn the spindle by hand as you move the selector to enable the gears to mesh.

Auto-Downfeed (Engaged) Position

Figure 37. Downfeed selector in 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.

-38-

4.position the auto-downfeed direction pin in the center of the handwheel for the spindle travel that is correct for your operation. If nec- essary, 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 1750 RPM.

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

Model G0747/G0748 (Mfg. Since 8/12)