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Model G0790 (Mfd. Since 9/15)
Pitch & Glue Build-up
Problem: Glue and resin buildup on the rollers
and cutterhead will cause overheating by decreas-
ing cutting sharpness while increasing drag in the
feed mechanism. The result can include scorched
lumber as well as uneven knife marks and chatter.
Solution: Clean the rollers and cutterhead.
Chip Marks or Indentations
Problem: Chip indentation or chip bruising is the
result of wood chips not being thrown away from
the cutterhead and out of the machine. Instead
they are carried around the cutterhead, deposited
on the planed surface and crushed by the outfeed
roller. Chip indentations can be caused by a num-
ber of reasons, some of which are:
• The type of lumber being planed. Certain
species have a tendency to chip bruise.
• A high moisture content (over 20%) or sur-
face moisture. Typically found in air-dried
stock where the surface is dry but the inside
needs a longer time to season.
• Dull knives.
• Too much material being removed in one
pass.
Solution:
• Lumber must be completely dry, preferably
kiln-dried (KD). Air-dried (AD) lumber must
be seasoned properly and have no surface
moisture. DO NOT surface partially-air-dried
(PAD) lumber.
• Make sure planer knives are sharp.
• Reduce depth of cut.
Depth of Cut
The planing depth on the Model G0790 is con-
trolled by the cutterhead elevation crank on top of
the planer. Turning the crank clockwise raises the
cutterhead; turning it counterclockwise lowers the
cutterhead.
Elevation Crank
The elevation crank provides a simple and accu-
rate method for producing cuts of consistent
depth on multiple passes.
The pitch of the elevation leadscrew is 16 TPI
(threads per inch), meaning that every turn of the
crank will move 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
(see 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 the operation, backlash
will not be a factor.
1
⁄4 Turn
=
1
⁄64"
1
⁄2 Turn
=
1
⁄32"
3
⁄4 Turn
=
3
⁄64"
1 Turn
=
1
⁄16"
DownUp
Figure 14. Crank elevation increments.
Although the correct depth of cut varies according
to wood hardness and workpiece width, we rec-
ommend a maximum depth of cut no more than
1
⁄32". A series of light cuts will give better results
and put less stress on the planer than trying to
take off too much material in a single pass.