Southbend South Bend 16 SPEED GEARHEAD LATHE SB1053 - Manual (Page 61)

For Machines Mfg. Since 3/11 16-Speed Gearhead Lathe
-59-
O P E R A T I O N
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.
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.
Figure 88. Thread dial engaged with the leadscrew.
Dial Gear
Hand Knob
Leadscrew
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.
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!
Cross Slide
Disengaged
Feed Control
Lever
Carriage
Engaged
Halfnut
Lever
Disengaged
Feed Control
Lever
Half Nut
Lever
Figure 87. Apron threading controls.