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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.
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Backlash is adjusted by tightening or loosening the screw
shown in =`^li\+*.
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.
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When adjusting gibs (=`^li\j++Xe[+,), 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 (=`^li\++), 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.
=`^li\+,%Half-nut saddle gib locations.
3 Saddle Gib
Adjustment Points
Half Nut Gib
Adjustments
Points
(Thread Dial
Removed)
=`^li\++%Gib adjustment points.
3 Compound Rest Gib
Adjustment Points
=`^li\+*%Cross slide adjustment.
Cross Slide
Backlash
Adjustment
Cap Screw
1 of 3 Cross Slide Gib
Adjustment Points