Tramming The Mill - Grizzly G0757 Owner's Manual

Tramming the Mill

When your operation requires that the spindle
axis be precisely perpendicular to the table, you
must tram the mill. Simply adjusting the headstock
tilt to the 90° mark on the tilt scale will not be pre-
cise enough for highly accurate results.
This procedure involves mounting a dial indicator
to the quill or spindle, rotating it around the table,
and adjusting the head position so that the spindle
axis is 90° to the table X-axis, as illustrated in
Figure 32.
Table
Figure 32. Spindle centerline properly trammed
to the table.
Note: Keep in mind that the top surface of your
workpiece will not likely be exactly parallel with the
table top. Depending on your operation, you may
choose to tram the spindle to the top surface of
the workpiece after it is mounted instead of tram-
ming to the table.
-34-
Spindle
Z-Axis
9 0
º
X-Axis
Tools Needed
Dial Indicator (with at least 0.0005" resolution) . 1
Indicator Holder (mounted on quill/spindle) ....... 1
Precision Parallel Block (1-2-3 Blocks) .............. 1
Note: A precision-ground plate can be substituted
for the parallel block. The farther the indicator
point can be placed from the spindle axis, the
more accurate the alignment measurements will
be.
To tram the mill:
1.
DISCONNECT MACHINE FROM POWER!
2.
Prepare the machine by performing the fol-
lowing tasks:
— Stone the table to remove all nicks and
burrs, then clean off all debris. Verify the
table is clean by running your hand over
the top of it.
— Position the table for the operation you
intend to perform after tramming—prefer-
ably centered with the saddle.
— Tighten any table locks that should be tight
during the intended milling operation.
3. Place the parallel block underneath spindle.
Model G0757 (Mfg. Since 6/13)
Qty