Southbend SB1001 owner manual Gib Adjustment, Saddle Gib, To adjust the saddle gib

Model SB1001 8K™ Lathe S E R V I C E For Machines Mfg. Since 8/11

Gib Adjustment

The goal of adjusting the gib screws is to remove sloppiness or "play" from the ways without over- adjusting them to the point where they become stiff and difficult to move.

In general, loose gibs cause poor finishes and tool chatter; however, over-tightened gibs cause premature wear and make it difficult to turn the handwheels.

The gib adjustment process usually requires some trial-and-error. Repeat the adjustment process as necessary until you find the best balance between loose and stiff movement. Most machinists find that the ideal gib adjustment is one where a small amount of drag or resistance is present, yet the handwheels are still easy to move.

Before you begin adjusting the gibs, make sure the ways are free of chips and grime, and they are well lubricated so they can move smoothly and without interference.

Saddle Gib

The saddle gib is located underneath the rear of the saddle (see Figure 89). This gib is a flat bar that is sandwiched between the gib plate and the bedway.

Tools Needed	Qty
Wrench 8mm	1
Hex Wrench 2.5mm	1

To adjust the saddle gib:

1.DISCONNECT LATHE FROM POWER!

2.Make sure the carriage lock is loose and the half nut is disengaged so that the carriage can move freely.

3.Loosen the hex nuts on the gib screws, then loosen the gib screws two or three turns.

4.Use the handwheel to move the carriage back and forth—this will ensure the gib is loose.

5.Re-tighten the gibs screw evenly until a slight resistance is felt, then use the handwheel to test carriage movement.

—Loosen or tighten the gib screws evenly until you are satisfied with the gib adjustment.

6.Without moving the gib screws, re-tighten the hex nuts to secure the settings.

Gib

Gib Plate

Gib Screws

Figure 89. Saddle gib components.

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