Grizzly G9298 owner manual Spindle Alignment, Horizontal Position Alignment

Spindle Alignment

Whether the rotary table is mounted horizontally or vertically, you must align the centers of the rotary table and mill spindle to achieve quality results.

There are many ways to align the rotary table, and it is up to the machinist and his capabilities to decide which approach is best.

Horizontal Position Alignment

Two methods are described below for aligning the spindles when the rotary table is mounted horizontally.

To use a test indicator to align the rotary table:

1.DISCONNECT MILL FROM POWER!

2.Mount a test indicator on the mill spindle and position the indicator tip on the inside vertical surface of the rotary table spindle bore, as shown in Figure 4.

Note: Refer to Accessories on Page 15 for test indicator options from Grizzly.

Spindle

Bore

Step

Test

Indicator

Figure 4. Test indicator properly positioned.

G9298/G9299/G9300 Rotary Table

3.Turn the mill spindle so that the test indicator is aligned to the X-axis of the mill table.

Note: For best results, turn the mill spindle in only one direction.

4.Slowly move the mill table until the test indi- cator reads zero deviation.

5.Rotate the mill spindle and test indicator 90°, then repeat Step 4.

6.Repeat Step 5 until the test indicator reads zero deviation in all four directions.

Tip: Use a mirror to read the indicator when it is facing away from you.

To use an edge finder to align the rotary table:

1.Mount an edge finder into the mill spindle, then position it roughly in the center of the rotary table spindle bore and below the rotary table surface.

2.Turn the spindle ON and set the speed to 800–1000 RPM, then slowly move the mill table along the X-axis in one direction.

3.When you find the edge of the rotary table spindle bore, note the position of the table on the handwheel dial.

Note: When recording the mill table position, take into account the backlash that is usually present in the leadscrew.

4.Slowly move the mill table in the opposite direction until you again find the edge of the spindle bore, then note the table's position on the handwheel dial.

5.Calculate the difference of the mill table posi- tions noted in Steps 3–4, then subtract 1⁄2 the diameter of the edge finder.

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