Tramming Spindle - Grizzly G0751 Owner's Manual

Tramming Spindle

When the operation requires that the spindle
axis be precisely perpendicular to the table, the
spindle must be trammed with the table. simply
adjusting the headstock tilt to the 90° mark on
the tilt scale will not be precise 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 49.
Table
Figure 49. spindle centerline properly trammed
to the table.
Note: Keep in mind that the top surface of your
workpiece will likely not be 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.
Model G0751 (Mfg. Since 1/13)
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 spindle with the table:
1.
disConneCt MaChine FroM poWer!
2.
prepare machine by performing the following
tasks:
— stone table to remove all nicks and burrs,
then clean off all debris. Verify table is
clean by running your hand over the top of
it.
— position table for the operation you intend
to perform after tramming—preferably cen-
tered with saddle.
— tighten any table locks that should be tight
during intended milling operation.
3. place parallel block underneath spindle.
4. install indicator holder into spindle or onto
quill, then mount indicator onto it so that
the point is as parallel to the block as pos-
sible (see the illustration in Figure 50 for an
example).
Indicator
Holder
Dial Indicator
Parallel Block
Table
Figure 50. dial indicator mounted.
Qty
Spindle
-41-