Grizzly g0748, g0747 specification

5.To measure spindle alignment along the X-axis, place the parallel block directly under the spindle and indicator across the length of the table, as illustrated in Figure 71.

Note: If you must re-position the quill or the knee to accommodate the above step, then review the tasks in Step 2 to make sure the mill is properly prepared for tramming.

Note: Keep one of the rotation lock bolts just snug so the head does not move loosely while you adjust it. Remember to tighten all the rotation lock bolts after adjusting the head.

8.place the parallel block directly under the spindle and across the width of the table, as illustrated in Figure 72.

Table (Top View)

Parallel Block

Indicator Spindle

Figure 71. Parallel block and indicator positioned

for the X-axis measurement

(top view).

Note: Your general goal in the next steps should be to get the difference of the indicator readings between the ends of the parallel bar down to 0.0005". However, the acceptable variance will depend on the requirements for your operation.

6.rotate the spindle by hand so that the indi- cator point rests on one end of the parallel block, as illustrated in Figures 70–71, then zero the dial.

7.rotate the spindle so that the indicator point rests in the same manner on other end of the block, then read the dial.

—if the indicator dial still reads zero or is within the acceptable variance, continue on with Step 8.

—if the indicator dial has moved from zero beyond the acceptable variance, you will need to compensate for that amount by rotating the head left or right. Repeat Steps 6–7until you are satisfied with the spindle axis alignment along the table X-axis.

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

Table (Top View)

Indicator

Spindle

Parallel Block

Figure 72. Parallel block and indicator positioned

for the Y-axis measurement

(top view).

9.rotate the spindle so the indicator point rests on the parallel bar, as illustrated in Figure 72, then zero the dial.

10.rotate the spindle so that the indicator point rests on the other end of the bar in the same manner, then read the dial.

—if the indicator dial still reads zero or is within the acceptable variance, the spindle is precisely perpendicular to the table in both the X- and Y-axes, and the tramming procedure is complete.

—if the indicator dial has moved from zero beyond the acceptable variance, you will need to compensate for that amount by tilt- ing the head forward or backward. Repeat Steps 9–10until you are satisfied with the spindle axis alignment along the table Y-axis.

Note: Keep one of the tilt lock bolts just snug so the head does not move loosely while you adjust it. Remember to tighten all the tilt lock bolts after adjusting the head.

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