Grizzly G8689Z Owner's Manual page 40

Note: A precision-ground plate can be substi-
tuted for the parallel blocks. Keep in mind that
the farther the indicator point can be placed from
the spindle axis, the more accurate the alignment
measurements will be.
To tram spindle to table:
1.
DISCONNECT MACHINE FROM POWER!
2.
Prepare machine for tramming by performing
following tasks:
• Verify table is clean by running your hand
over top of it. If necessary, stone table to
remove all nicks and burrs, then clean off
all debris.
• Position table for milling operation you
intend to perform after tramming—prefer-
ably centered with headstock.
• Tighten Z-axis lock handle.
3.
Place parallel block underneath spindle.
4.
Install indicator holder in spindle, then mount
indicator so that point is as parallel to block
as possible (see Figure 60).
Dial Test
Indicator
Parallel Block
Table
Figure 60. Dial test indicator mounted.
5.
To measure spindle alignment along X-axis,
place parallel block directly under spindle and
indicator across length of table, as illustrated
in Figure 61.
-38-
Note: If you must re-position headstock to
accommodate above step, then review tasks
in Step 2 to make sure machine is properly
prepared for tramming.
Parallel Block
Figure 61. Parallel block and indicator positioned
Note: Your general goal in next steps should
be to compare indicator readings between
two ends of parallel block down to 0.0005".
However, acceptable variance will depend on
requirements for operation.
6. Rotate spindle by hand so that indicator point
rests on one end of parallel block, as illus-
trated in Figures 60–61, then zero dial.
7. Rotate spindle so that indicator point rests
Spindle
in same manner on other end of block, then
read dial.
— If indicator dial still reads zero or is within
Indicator
Holder
— If indicator dial has moved from zero
Dial Test Indicator
Table
for X-axis measurement.
acceptable variance, spindle is precisely
perpendicular to table in X-axis and tram-
ming procedure is complete.
beyond acceptable variance, you will
need to compensate for that amount by
tilting column left or right. Repeat Steps
6–7 until you are satisfied with spindle
axis alignment along table X-axis.
Model G8689Z (Mfd. Since 07/23)
Spindle