Grizzly Vertical Milling Machines G0728 - Manual (Page 28)

-26-
Models G0728–31 (Mfg. Since 11/11)
Tramming Spindle
tramming the spindle ensures that the spindle
and table are perpendicular along the X-axis (see
figure 29). this operation should be performed
when returning the spindle to the vertical position
after operations in which the head was tilted.
Tools Needed Qty
Wrench 17mm.................................................... 1
Dial test indicator .............................................. 1
indicator holder ................................................. 1
precision parallel Block ..................................... 1
To tram the spindle:
1. DisConnECt thE Mill FroM poWEr!
2. loosen the 4 head tilt hex nuts and lock
washers.
Note: When tramming the spindle it is best to
tighten the nuts snug enough that the head
needs light taps with a rubber mallet to move.
This prevents the head from moving freely and
losing adjustments between measurements.
3. Ensure the table is free from chips and nicks
that may change the elevation of the parallel
block.
4. Center the parallel block under the spindle
and tighten the table, knee, and quill locks to
eliminate unwanted movement.
Table
Spindle
X-Axis
Z-Axis
90º
figure 29. spindle perpendicular to the table in
the X-axis.
5. With the test indicator attached to the indica-
tor holder, mount the holder in the spindle.
Note: The goal is to adjust the head so that
the differences between the measurements
are zero within the capabilities of the test
indicator. However, specific tolerances will be
determined by each operation.
6. Measure spindle alignment along the X-axis at
one end of the parallel block (see figure 30).
7. rotate the spindle by hand so that the indica-
tor rests on the other end of the parallel block
along the X-axis.
—if the indicator dial reads zero or is with-
in the acceptable tolerances, continue to
Step 8.
—if the indicator has moved from zero out-
side acceptable tolerances, adjust the tilt
of the head and repeat
Steps 6 and 7.
8. retighten the four hex nuts and lock washers.
figure 30. Dial test indicator mounted.
Table
Spindle
Dial Test Indicator
Indicator Holder
Parallel Block
Always lock the head in place after adjusting
tilt. unexpected movement of the head
during operations could cause the cutter
to bind with the workpiece, resulting in
personal injury, and possible damage to the
cutter and workpiece.