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7.
Loosen the inner spanner nut one turn.
Note: You may have to tap on the outboard
end of the spindle as explained in Step 8, to
help unload the spindle and break the span-
ner nut loose.
8.
Place a wooden block over the outboard end
of the spindle, tap it a few times with a small
sledge or heavy dead blow hammer (Figure
135). Your goal is to slide the spindle forward
just enough to introduce spindle end-play that
you can feel by hand.
Figure 135. Introducing detectable end-play.
9.
Place a dial indicator on the cross slide and
move the carriage toward the headstock until
the contact point of the indicator touches the
spindle face, as shown in Figure 136.
Figure 136. Dial indicator setup.
10. Move the carriage an additional 0.100" toward
the headstock.
Model G0750G (Mfd. Since 5/15)
11. Insert the chuck key into a cam socket to
prevent the spindle from turning, then tighten
the inner spanner nut until the dial indicator
needle just stops moving (see Figure 137).
Note: For convenience and accuracy, we
recommend having another person watch the
dial while you tighten the inner spanner nut.
Figure 137. Adjusting spindle bearings.
While tightening the inner spanner nut,
rock the spindle back and forth slightly with
the chuck key to make sure the spindle
tapered roller bearings seat properly in their
races.
When the dial indicator needle stops mov-
ing, there will be no spindle end-play and no
bearing preload. It is important that you find
this point without tightening the spanner nut
too much and inadvertently preloading the
spindle bearings.
If you think you have gone past the zero end-
play point, unload the bearings by repeating
Steps 7–8, then re-tighten the inner spanner
nut until it has reached the zero end play
position.
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