Grizzly G0689 - Manual (Page 18)

-16-
g0689 13" planer
Depth-of-Cut
the planing depth is controlled by the cutterhead
elevation crank on top of the planer. turning the
crank clockwise raises the cutterhead and turning
it counterclockwise lowers the cutterhead.
the Model g0689 has multiple methods for
determining the depth-of-cut depending on your
planing needs. the elevation crank, cutterhead
elevation scale, thickness stop, and depth-of-cut
gauge all provide a means for accurately measur-
ing the material that will be removed from wood
workpieces.
Elevation Crank
the elevation crank provides a simple and accu-
rate method for producing consistent-depth cuts
on multiple passes. the pitch of the elevation
leadscrew is 16 threads per inch, meaning that
every turn of the crank will lower the cutterhead
1 ⁄
16
". using this as a base, you can make passes
with a depth-of-cut of 1 ⁄
64
", 1 ⁄
32
", 3 ⁄
64
" and 1 ⁄
16
" by
turning the crank 1 ⁄
4
turn, 1 ⁄
2
turn, 3 ⁄
4
turn, and one
full turn, respectively ( figure 14).
Note: Any time you switch directions with the
cutterhead elevation crank, there will be a small
amount of backlash—so the first turn of the crank
after switching directions will be slightly less than
1 ⁄
16
". However, as long as you move the crank in
the same direction during operation, backlash will
not be a factor.
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figure 14. Crank elevation increments.
Depth-of-Cut Gauge
the depth-of-cut gauge can be used to accurately
and directly measure the depth-of-cut, indepen-
dent of workpiece thickness. By measuring the
difference in elevation of the top surface of the
workpiece and the cutterhead knives (at their low-
est points), the value displayed on the depth-of-
cut gauge accurately represents the thickness of
material that will be removed in that pass.
To use the depth-of-cut gauge:
1. lower the cutterhead assembly to just above
your workpiece, then place your workpiece
under the center of the cutterhead assem-
bly, as shown in
figure 15. (Make sure the
workpiece only extends 1"–2" under the front
of the gauge and does not extend into the
path of the cutterhead knives.)
2. Continue lowering the cutterhead assembly
until you see the depth-of-cut gauge indicator
begin to move. turn the cutterhead elevation
crank until the desired depth-of-cut is indi-
cated by the gauge.
3. remove the workpiece, then make your plan-
ing pass.
Note: The depth-of-cut gauge should only be
used for approximate measurements. If pre-
cise workpiece thicknesses are needed, use
calipers to ensure your workpieces meet your
standards.
Note: Sliding the gauge cover to the "Open"
position disables the gauge.
figure 15. depth-of-cut gauge .
depth-of-Cut gauge
gauge Cover