Truing Head - Grizzly WOOD MILL G9959 Instruction Manual

Truing Head

The head casting can be set perfectly square to
the table from side to side. It is especially impor-
tant to check this after it has been tilted. There
are a number of methods to determine if its
square. Two methods are described below.
Method one incorporates the use of a dial or test
indicator, the support assembly from a magnetic
base and a drill chuck mounted into the spindle of
the Wood Mill.
1. Remove the support assembly from the
magnetic base and install it into the drill
chuck.
2. Position the support arm so that it is hori-
zontal with the table top.
3. Mount the dial or test indicator onto the
support arm as in Figure 11.
4. Lift the table using the knee until the dial
has moved at least
5. Turn the spindle by hand until the dial is
positioned on the right hand side and turn
the dial until the "0" on its face is under the
indicator needle.
6. Carefully rotate the spindle until the dial is
positioned on the left hand side of the spin-
dle. Read the dial.
7. If the dial does not read the same when
positioned from one side to the next, loosen
the hex nuts that secure the head tilt and
adjust the head
dial.
8. Repeat step 6 and 7 until the dial mea-
sures the same on the right and the left side
of the table.
G9959/G9977 Wood Mill
1 ⁄ revolution.
2
1 ⁄ the error shown on the
2
Figure 11. Indicator mounted to test head.
Method two uses a large machinist square.
1. Extend the quill down as far as it will travel
and lock it in place.
2. Place the square on the machine table and
check the quill body for square.
3. If adjustment is necessary, loosen the hex
nuts that secure the head tilt and adjust as
needed.
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