Southbend SB1053 owner manual Apron Controls, Thread Dial, Feed Control Lever Disengaged Halfnut

For Machines Mfg. Since 3/11 O P E R A T I O N 16-Speed Gearhead Lathe

Apron Controls

The half nut lever engages the apron with the leadscrew which moves the carriage and cutting tool along the length of the workpiece for threading operations (see Figure 87).

Important: Make sure the feed control 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 88.

Leadscrew

Dial Gear

Hand Knob

Cross Slide

Disengaged

Carriage

Feed Control

Lever

Disengaged

Halfnut

Lever

Engaged

Figure 88. 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 and prevent an apron crash!

Figure 87. Apron threading controls.

Attempting to engage the half nut while the cross slide or carriage is engaged with the feed rod could cause severe damage to the lathe. Never attempt to engage the half nut while the feed control lever is engaged.

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