Model G0781 (Mfd. Since 2/15)
-37-
5. To measure spindle alignment along X-axis,
place parallel block directly under spindle and
indicator across length of table, as illustrated
in
Figure 47.
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.
Parallel Block
Indicator
Spindle
Table (Top View)
Figure 47. Parallel block and indicator positioned
for the X-axis measurement.
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 spindle by hand so that indicator point
rests on one end of parallel block, as illus-
trated in
Figures 46–47, then zero the dial.
7. Rotate spindle so that indicator point rests
in same manner on other end of block, then
read 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
6–7 until you are satisfied with the spindle
axis alignment along the table X-axis.
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 parallel block directly under spindle
and across width of table, as illustrated in
Figure 48.
9. Rotate spindle so indicator point rests on par-
allel bar, as illustrated in
Figure 48, then zero
the dial.
10. Rotate spindle so that indicator point rests on
other end of bar in same manner, then read
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-axis, 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 9–10 until 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.
Parallel Block
Indicator
Spindle
Table (Top View)
Figure 48. Parallel block and indicator positioned
for the Y-axis measurement.
Summary of Contents for G0781
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