-78-
Model G0750GV (Mfd. Since 03/18)
9. Place dial indicator on cross slide and move
carriage toward headstock until contact point
of indicator touches spindle face, as shown in
Figure 136.
Figure 136. Dial indicator setup.
11. Insert chuck key into a cam socket to prevent
spindle from turning, then tighten inner span-
ner nut until 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.
7. Loosen 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 wooden block over outboard end of
spindle, tap it a few times with a small sledge
or heavy dead-blow hammer (
Figure 135).
Your goal is to slide spindle forward just
enough to introduce spindle end play that you
can feel by hand.
Figure 135. Introducing detectable end-play.
10. Move carriage an additional 0.100" toward
headstock.
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 7–11, then re-tighten the inner span-
ner nut until it has reached the zero end play
position.
Summary of Contents for G0750GV
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