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Model M1099 (Mfg Since 8/07)
Cross Slide Backlash
Adjustment
Backlash is the amount of play found in a lead screw. It
can be found by turning the cross slide handwheel in one
direction, then turning the handwheel the other direction.
When the cross slide begins to move, the backlash has
been taken up.
Note: Avoid the temptation to overtighten the cross slide
backlash screw. Overtightening will cause excessive wear
to the sliding block and lead screw.
Backlash is adjusted by tightening or loosening the screw
shown in Figure 43.
This screw draws a wedge-type nut against the lead screw
and main nut. If it is too tight, loosen the screw a few
turns and tap the cross slide a few times with a rub-
ber or wooden mallet. Then turn the handle slowly back
and forth until the handle turns freely. To readjust the
backlash, rock the handle back and forth and tighten the
screw slowly until the backlash is at between 0.001" to
0.002" as indicated on the handwheel.
Note: Reducing backlash to less than 0.001" is impractical
and reduces the life of the cross slide.
Gib Adjustments
When adjusting gibs (Figures 44 and 45), the goal is to
remove sloppiness in the ways without causing the slides
or half nut to bind. Loose gibs will cause a poor finish on
the workpiece and wear the slide. Tight gibs will damage
the slide, lead screw, and half-nut. The cross slide gib is a
tapered piece of iron. When the opposing front and rear
gib adjustment screws are turned in opposing directions,
the screws force the tapered gibs to fill the void in the
way, thus tightening the play in the cross slide. If more
play is needed turn the screws the other direction.
For the three saddle gibs (Figure 44), loosen the jam
nuts and turn the three set screws until slight tension is
felt and the gib plates are slightly pre-loaded against the
underside of the flat-way. Tighten the jam nuts when fin-
ished.
1 of 3 Cross Slide Gib
Adjustment Points
Cross Slide
Backlash
Adjustment
Cap Screw
Figure 43. Cross slide adjustment.
3 Compound Rest Gib
Adjustment Points
Figure 44. Gib adjustment points.
Half Nut Gib
Adjustments
Points
(Thread Dial
Removed)
Figure 45. Half-nut saddle gib locations.
-37-
3 Saddle Gib
Adjustment Points
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