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.)
Depth-of-Cut Gauge
Gauge Cover
Figure 15. Depth-of-cut gauge.
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.
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).
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Figure 14. Crank elevation increments.
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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