Grizzly g0747, g0748 owner manual Tramming Spindle, To tram the spindle to the table

Tramming Spindle

After positioning the head at an angle and when your operation requires that the spindle axis be precisely perpendicular to the table, you must tram or align the spindle with the table to ensure the spindle is exactly 90° to the table.

This procedure involves mounting a dial test indicator to the quill or spindle, rotating it around the table, and adjusting the spindle axis (Z-axis) 90° to the table X- and Y-axes, as illustrated in Figure 69.

Spindle

	Z-Axis
Y-Axis	90º
90º

X-Axis

Table

Figure 69. Spindle Z-axis perpendicular to the

table X- and Y-axis.

We encourage you to research the many varia- tions of spindle tramming to find the one that works best for you. If you do not already have a preference for performing this operation, use the following widely-used procedure for accurately tramming the spindle to the table.

Keep in mind that all workpiece top surfaces are not exactly parallel with the table top. You may choose to tram the spindle to the top surface of the workpiece after it is mounted instead of that of the table.

Tools Needed	Qty
Dial Test Indicator
(with at least 0.0005" resolution)	.................. 1
Indicator Holder
(mounted on the quill/spindle)	1
Precision Parallel Block
(at least 9" in length)	1
-54-

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 the spindle to the table:

1.disCONNECT MILL FROM POWER!

2.prepare the mill for tramming by performing the following tasks:

•Verify the table is clean by running your hand over the top of it. If necessary, stone the table to remove all nicks and burrs, then clean off all debris.

•position the table for the milling operation you intend to perform after tramming— preferably centered with the saddle.

•tighten any table, knee, quill, or ram locks that should be tight during the intended milling operation.

3.place the parallel block underneath the spin- dle.

4.install the indicator holder in the spindle or on the quill, then mount the indicator so that the point is as parallel to the block as possible (see the illustration in Figure 70).

Indicator Holder
Dial Test	Spindle
Indicator

Parallel Block

Table

Figure 70. Dial test indicator mounted.

Model G0747/G0748 (Mfg. Since 8/12)