Grizzly G0795Z, Руководство пользователя

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Model G0795Z (Mfd. Since 06/17)
-21-
Using Spindle
Downfeed Controls
The Model G0795Z is equipped with coarse
and fine spindle downfeed controls, as shown in
Figure 14. Coarse downfeed is typically used with
drilling operations, and fine downfeed is typically
used with milling operations.
To engage the fine downfeed, turn the downfeed
selector knob clockwise until tightened. When fine
downfeed is engaged, the spindle only moves up
or down when the handwheel is rotated (there is
no automatic spindle return to the top position, as
with the coarse downfeed controls). This manual
level of control makes it easy to precisely lock the
spindle height in place with the quill lock lever
when milling a flat surface across the face of a
workpiece, to ensure the spindle height does not
move until the entire milling operation is complete.
The graduated dial measures spindle movement
in 0.001" increments, with one full revolution
equaling 0.080" of spindle travel.
In the following example, the fine downfeed
controls are used to mill 0.010" off a workpiece:
1. Use headstock elevation crank (see
Identification, Page 3) to adjust cutting tool
just above workpiece surface, then secure
headstock with Z-axis lock levers.
2. Tighten downfeed selector knob (see Figure
14) to engage fine downfeed handwheel.
3. Loosen quill lock lever.
4. Rotate fine downfeed handwheel clockwise
and lower cutting tool so it just touches
workpiece.
5. Move workpiece out of the way, using X/Y
table handwheels.
6. Using graduated dial to gauge spindle move-
ment, rotate fine downfeed handwheel clock-
wise 0.010".
7. Tighten quill lock lever.
8. Position workpiece under cutting tool.
9. Start spindle, adjust speed as appropriate for
cutting tool/workpiece type,
and perform cut-
ting pass using X/Y table handwheels.
When coarse downfeed is engaged, pull handles
downward to lower the spindle. An internal coil
spring will raise the spindle back up when you
stop applying downward pressure on the handle.
Note: To maintain control of the upward spindle
travel and the rotating bit in your workpiece,
always continue holding the handle until the
spindle returns to the top position. Letting go of
the coarse downfeed handles when the spindle
is in the lowered position will cause the spindle to
retract too quickly and slam up into the headstock
or lift the workpiece and cause it to spin out of
control.
Fine
Downfeed
Handwheel
Figure 14. Spindle controls.
Coarse
Downfeed
Handle
Using Fine Downfeed Controls
The fine downfeed handwheel allows for a pre-
cise amount of material to be removed from the
workpiece.
Downfeed
Selector Knob
Quill Lock
Lever
Coarse Downfeed
Fine Downfeed