Pinion gear backlash, Leadscrew end play – Southbend SB1022 User Manual
Page 39
For Machines Mfg. Since 8/09
Model SB1021/SB1022
-37-
S E R V I C E
Pinion Gear Backlash
During the life of the machine, the variable
speed handwheel may develop extra backlash
due to normal wear of the pinion gears. If this
lash becomes unacceptable, use this procedure to
reduce the backlash.
To reduce the pinion gear backlash:
1. DISCONNECT BANDSAW FROM POWER!
2. Remove the rear lower access panel, and use
a 4mm hex wrench to loosen both pinion gear
locking set screws (Figure 44) just enough
to adjust the pinion gears.
Leadscrew End Play
If you notice that the leadscrew has end play
and the variable speed handwheel has excess
backlash after the pinion gear lash has been
set, you can adjust the lead screw collars as an
additional measure to reduce the backlash.
To adjust the lead screw collars to reduce
backlash:
1. DISCONNECT BANDSAW FROM POWER!
2. Remove the rear lower access panel, and
use a 4mm hex wrench to loosen both collar
locking set screws just enough to adjust the
collars (Figure 45).
3. Slide the pinions closer together, and tighten
the set screws. If excess backlash still exists,
refer to the Leadscrew End Play section,
then proceed to Step 4.
Note:
Make sure that the set screws remain
aligned with the flats on the shaft. If one or
both setscrews do not return to their original
depth in the pinion gear after tightening, the
alignment has probably been lost and needs
to be corrected.
4. Clean and grease the pinion gears and the
leadscrew, then reinstall the access panel.
3. Slide the right-hand leadscrew collar
against the support boss and tighten the set
screws. If excess backlash still exists at the
handwheel, you may have to readjust the
pinion gear lash, replace the leadscrew half
nut, or replace worn bolts or linkage (Figure
45).
4. Reinstall the access panel.
Figure 46. Linkage location and parts.
Leadscrew
Halfnut
Bolts
Linkage
Figure 44. Location of pinion gears.
Pinion Gears
!
Figure 45. Leadscrew adjustment locations.
Leadscrew
Support Boss
Leadscrew Collars w/
Locking Set Screws
!