SERVICE
South Bend Tools
South Bend Tools
-50-
For Machines Mfd. Since 7/19
Model SB1065F–SB1071F
S E R V I C E
Backlash Adjustments
Backlash is the amount of free play felt while
changing rotation directions with the handwheel.
This can be adjusted at the leadscrew half nut.
Before beginning any adjustment, make sure
that all associated components have been cleaned
and lubricated.
IMPORTANT:
Avoid the temptation to overtighten
the adjustment screws. Overtightening will cause
excessive wear to the nut and leadscrew. Reducing
backlash to less than 0.002" is impractical and
introduces premature wear.
Note:
If you end up adjusting the nut too tight,
loosen the set screws, 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.
Tools Needed
Qty
Hex Wrench 3mm .................................................1
Open-End Wrench 10mm .....................................1
The compound rest backlash is adjusted by
loosening both jam nuts and tightening the set
screws shown in Figure 75. When these screws
are adjusted against the leadscrew nut, they
offset part of the nut to remove play between the
nut and leadscrew.
To adjust backlash, rock the handwheel back and
forth, while tightening the screws slowly until
the backlash is approximately 0.002"–0.003", as
indicated on the graduated dial.
Figure 75. Compound rest leadscrew adjustment.
Figure 75. Compound rest leadscrew adjustment.
Set Screws
Set Screws
and Jam Nuts
and Jam Nuts
Compound Rest
Cross Slide
Tools Needed
Qty
Hex Wrench 4mm .................................................1
Hex Wrench 5mm ................................................1
The cross slide backlash is adjusted by tightening
or loosening the cap screws shown in Figure 76.
These screws draw a wedge-type nut against the
leadscrew and main nut.
Figure 76. Cross slide backlash adjustment screws.
Figure 76. Cross slide backlash adjustment screws.
Set
Set
Screw
Screw
Cap Screws
Cap Screws
If the adjustment is too tight, loosen the cap
screws a couple of turns, and tap the cross slide a
few times with a rubber or wooden mallet as you
turn the handle back and forth slowly until the
handle turns freely.
To readjust the backlash, rock the handle back
and forth, and slowly, in an alternating pattern,
tighten the screws slowly until the backlash is
reduced to approximately 0.002", as indicated on
the handwheel dial.
Summary of Contents for Oil Country Series
Page 65: ...South Bend Tools...
Page 66: ......
