Woodstock Shop Fox M1112 Owner's Manual page 50

7. Place a wooden block over the outboard end of the
spindle, hit it soundly with a small sledge or heavy
dead blow hammer. Your goal is to slide the spindle
forward just enough to introduce spindle end-play
that you can feel by hand.
8. 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
(Figure 68).
9. Move the carriage an additional 0.100
headstock.
10. Insert the chuck key into a cam socket and prevent
the spindle from turning. Tighten the inner spanner
nut until you see the motion of the needle in the
dial indicator just barely stop moving (Figure 69).
During the spanner nut tightening process, rock the
spindle back and forth slightly with the chuck key to
make sure the spindle tapered roller bearings seat
properly in the tapered bearing races.
When the dial indicator needle stops moving,
there will not be any spindle end-play nor bearing
preload. It is essential that you find this point
without tightening the spanner nut too much and
inadvertently preloading the spindle bearings.
Since it can take great effort to turn the inner
spanner nut, you may find it difficult to know if you
have gone past the zero end-play point or not. You
may find it easiest to have someone watch the dial
for you while you tighten the inner spanner nut.
If you think you may have gone past the zero end-
play point, take the time to unload the bearings as
described earlier, then re-tighten the inner spanner
nut until you know you have reached the correct
setting.
When you are confident that you have adjusted the
inner spanner nut until zero spindle end-play and
preload exists, you now must move the spanner
inward an additional 0.001" to set the preload.
11. To set the preload, tighten the spanner nut an
additional 0.16" along its circumference. See Figure
70 for the example of this measurement.
Model M1112 (For Machines Mfd. Since 12/20)
"
toward the
Figure 69. Adjusting spindle bearings.
Figure 70. Final spanner nut rotation.
-48-
Figure 68. Dial indicator set up.
0.16" Travel