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For Machines Mfg. Since 5/11 13" x 40" Heavy 13
®
EVS Lathe
-55-
OPERATION
Apron Threading Controls
The half nut lever (see Figure 74) engages the
carriage with the leadscrew, which moves the
carriage and cutting tool along the length of the
workpiece for threading operations.
Important: Make sure the feed selection lever is
disengaged before attempting to engage the half
nut.
Figure 74. Apron threading controls.
Cross Slide
Disengaged
Feed Selection
Lever
Carriage
Engaged
Halfnut
Lever
Disengaged
Half Nut
Lever
Feed Selection
Lever
Thread Dial
When inch threading, the numbers on the thread
dial are used with the thread dial chart to show
when to engage the half nut.
The thread dial gear must be engaged with the
leadscrew for this to work (see Figure 75). To
engage the dial gear, 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.
When threading, we recommend using the
slowest speed possible and avoiding deep
cuts, so you are able to disengage the half nut
when required and prevent an apron crash!
Figure 75. Dial gear engaged with the leadscrew.
Dial Gear
Leadscrew
Knurled
Knob