Southbend South Bend 16 SPEED GEARHEAD LATHE SB1053 - Manual (Page 78)

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For Machines Mfg. Since 3/11 16-Speed Gearhead Lathe M A I N T E N A N C E
Cross Slide
Tools Needed: Qty
Hex Wrench 3mm ................................................. 1
Hex Wrench 5mm ................................................ 1
The cross slide backlash is adjusted by loosening
all four cap screws shown in Figure 122, then
tightening the center set screw. This will push
down on a wedge and force the leadscrew nut
apart, taking up lash between the nut and
leadscrew.
To adjust the backlash, remove the compound
rest and loosen the four cap screws. Then, rock
the cross slide handwheel back-and-forth and
tighten the set screw slowly until the backlash is
at approximately 0.002"–0.003" as indicated on
the handwheel dial.
If you end up adjusting the nut too tight, loosen
the set screw, tap the cross slide a few times
with a rubber or wooden mallet, and turn the
handwheel slowly back-and-forth, until the
handle turns freely—then try again.
Remember to retighten the four cap screws when
you are finished.
Figure 122. Cross slide backlash adjustment screws.
Set
Screw
Cap Screws
Over time, the leadscrew may develop a small
amount of end play. This can be easily corrected
by following this procedure.
Tools Needed: Qty
Hex Wrench 3mm ................................................. 1
Hex Wrench 5mm ................................................. 1
Wrench 24mm ...................................................... 1
To remove leadscrew end play:
1. DISCONNECT LATHE FROM POWER!
2. Remove the end cover on the right side of the
lathe to access the leadscrew end nut.
3. Loosen the two set screws in the leadscrew
end nut (see Figure 123).
Leadscrew End Play
Adjustment
4. Engage the half nut with the leadscrew.
5. Rotate the carriage handwheel back slightly
and tighten the end nut at the same time
until the end play is removed.
6. Retighten both set screws and replace the
end cover.
Figure 123. Leadscrew end nut.
Leadscrew End
Nut & Set
Screws