Grizzly G0509 - Manual (Page 48)

-46-
G0509 & G0509G 16" x 40" Lathe
saddle gib and carriage lock, see figure 60
located at the back side of the saddle, the saddle
gib is adjusted by the same method as the gibs on
the cross-slide and compound rest. however, you
must make sure that you loosen the carriage lock
bolt. this bolt is used to lock the carriage in place
for increased rigidity when making face cuts.
it is important that the saddle gib be properly
adjusted. A loose gib will cause finish problems in
a workpiece. A gib adjusted too tightly will cause
premature wear.
figure 60. Carriage lock bolt.
Carriage
lock Bolt
cross slide
leadscrew
adjustment
figure 61. Cross slide backlash adjustment
socket head cap screws.
Cap screws
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. Reducing backlash to less than 0.010"
is impractical and reduces cross slide life.
Backlash is adjusted by tightening or loosening
the cap screws shown in
figure 61. these screws
draw a wedge-type nut against the lead screw and
main nut. if you get the gib too tight, loosen the
cap screws a few turns, tap the cross slide a few
times with a rubber or wooden mallet, and 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 approximately 0.010" as indi-
cated on the handwheel dial.