South Bend Tools
For Machines Mfd. Since 12/21
Model SB1007
-57-
S E R V I C E
Backlash Adjustment
To adjust compound rest backlash:
1.
DISCONNECT LATHE FROM POWER!
2.
Loosen the three cap screws at base of
compound rest and slide complete assembly
off cross slide table.
3.
With base of compound rest facing upward
(see Figure 88), rotate cut-out hole until it
aligns with leadscrew and locate set screw.
4.
To adjust backlash, rock handwheel
back and forth while slowly loosening or
tightening set screw with 3mm wrench.
Backlash should be approximately 0.002"–
0.003", as indicated on the graduated dial.
Note:
If you end up adjusting the nut
too tightly, loosen the set screw, tap the
compound rest a few times with a rubber
or wooden mallet, and turn the handwheel
slowly back and forth until it moves freely—
then try again.
Backlash is the amount of free play felt in
the handwheel when changing direction of
rotation. This can be adjusted on the compound
rest and cross slide leadscrews, and the
amount of backlash can be observed on the
handwheel graduated dial. Before beginning
any adjustment, make sure that all associated
components have been cleaned and lubricated.
Reducing backlash to less than 0.002" is
impractical and can lead to accelerated wear
of the wedge, nut, and leadscrew. Avoid the
temptation to overtighten the backlash set
screw while adjusting.
Compound Rest
Tools Needed:
Qty
Hex Wrench 3mm .................................................1
Hex Wrench 6mm .................................................1
The compound rest backlash is adjusted
by tightening the set screw shown in
Figure 88. When this screw is tightened against
the leadscrew nut, it offsets part of the nut to
remove play between the nut and leadscrew.
Figure
Figure 88. Compound rest backlash components
. Compound rest backlash components
(viewed from underneath).
(viewed from underneath).
Location of
Location of
Backlash
Backlash
Set Screw
Set Screw
SERVICE
