Southbend 18' & 60: EVS Toolroom Lathes 220v sb1016 - Manual (Page 58)

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For Machines Mfg. Since 7/09 Model SB1016/SB1036 O P E R A T I O N
Half Nut Lever
The half nut lever locks the carriage to the
leadscrew which moves the cutting tool along the
length of the workpiece (Figures 93–94).
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!
Threading
If you are unfamiliar with how to cut threads on
a lathe, we strongly recommend that you read
books, review industry trade magazines, or get
formal training before beginning any attempting
any threading projects.
Power Feed Lever
The feed ON/OFF lever must be in the fully up
disengaged position or the internal lockout will
prevent the half nut lever from applying the half
nut. Also to avoid shearing the leadscrew shear
pin, the carriage lock (Figures 93–94) must be
loosened before threading begins.
Figure 93. Carriage controls.
Cross Feed
Gib lock
screw
Carriage
Lock
Half Nut Lever
Feed ON/OFF
Lever
Thread Dial & Chart Overview
The numbers on the thread dial are used with
the thread dial chart to show when to engage
the half nut during inch threading or threading
Witworth threads. The thread dial gear must
be engaged with the leadscrew for this to work.
Loosen the knurled thumb knob on the thread
dial, pivot the dial gear into mesh with the
leadscrew, then tighten the hand knob (see
Figure 95).
Figure 95. Thread dial gear engaged with the
leadscrew.
Leadscrew
Dial Gear
Thumb
Knob
Figure 94. Feed ON/OFF lever and half nut positions
for threading.
Engaged
Disengaged
Engaged
Disengaged
Halfnut Lever
and Halfnut
Feed Control
Lever