Grizzly G0755 owner manual Tramming Spindle, To tram the spindle with the table

Tramming Spindle

When your operation requires that the spindle axis be precisely perpendicular to the table, you must tram the spindle 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 55.

	Spindle
Table	Z-Axis
	X-Axis
Figure 55. 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.

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Tools Needed	Qty
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 56 for an example).

Indicator

HolderSpindle

Dial Indicator

Parallel Block

Table

Figure 56. Dial indicator mounted.

Model G0755 (Mfg. Since 1/13)