Southbend sb1039 Apron Threading Controls, Thread Dial, Feed Control Lever, Halfnut Lever Engaged

For Machines Mfg. Since 5/11 O P E R A T I O N 14" TURN-X®Toolroom Lathe

Apron Threading Controls

The half nut lever engages the carriage with the leadscrew which moves the carriage and cutting tool, along the length of the workpiece for threading operations (see Figure 78).

Important: Make sure the feed selection lever is in the disengaged (middle) position before attempting to engage the half nut.

Half Nut

Feed ControlLever

Lever

Thread Dial

The numbers on the thread dial are used with the thread dial chart to show when to engage the half nut during inch threading. The thread dial gear must be engaged with the leadscrew for this to work. Loosen the knurled knob on the thread dial, pivot the dial gear toward the leadscrew so that it properly meshes with the leadscrew threads, then re-tighten the knob, as shown Figure 79.

Leadscrew

Dial Gear

Knurled

Knob

Cross Slide

Disengaged

Carriage

Feed Control

Lever

Disengaged

Halfnut

Lever

Engaged

Figure 79. Thread dial engaged with the leadscrew.

When threading, we recommend using the slowest speed possible and avoiding deep cuts, so you are able to disengage the half nut

Figure 78. Apron threading controls.

when required and prevent an apron crash!

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