Southbend SB1042PF Leadscrew End Play Adjustment, Gib Adjustment, To remove leadscrew end play

For Machines Mfg. Since 3/11 S E R V I C E Turn-Nado®EVS Lathes

Leadscrew End Play Adjustment

After a long period of time, you may find that the leadscrew develops a small amount of end play. This end play can be removed with an easy adjustment.

Tools Needed:	Qty
Open End Wrench 36mm or 17⁄16"	........................ 1
Hex Wrench 3mm	1

To remove leadscrew end play:

1.DISCONNECT LATHE FROM POWER!

2.Loosen both retaining nut set screws (see Figure 117).

Set Screw

(1 of 2)

Leadscrew	Retaining
	Nut

Figure 117. Leadscrew end play adjustment.

3.Engage the half nut lever.

4.Rotate the carriage handwheel to move the carriage back slightly, then tighten the retaining nut at the same time until the end play is removed.

5.Tighten both set screws to secure the setting.

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.

Important: Before adjusting the gibs, loosen the locks for the device so that the gibs can freely slide during adjustment, then lubricate the ways.

The gibs are tapered and held in position by a screw at each end. To adjust the gib, turn one screw 1⁄4 turn clockwise and the other screw 1⁄4 turn counterclockwise, so both screws move in the same direction and the same amount. Test the feel of the sliding component by turning the handwheel, and adjust the gib screws as necessary to make it tighter or looser.

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.

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