Southbend SB1022 Pinion Gear Backlash, Leadscrew End Play, To reduce the pinion gear backlash

For Machines Mfg. Since 8/09 S E R V I C E Model SB1021/SB1022

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.

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 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.

! Pinion Gears

Figure 44. Location of pinion gears.

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.

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).

!	Support Boss
	Leadscrew

Leadscrew Collars w/

Locking Set Screws

Figure 45. Leadscrew adjustment locations.

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).

Linkage

Leadscrew

Halfnut

Bolts

Figure 46. Linkage location and parts.

4.Reinstall the access panel.

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