thread cutting – to ensure correct “pick-up” during thread cutting, leave
the auto feed lever engaged. Disengage the tool clear of the work. Stop
the spindle, electrically reverse the drive system and drive tool back
clear of the working piece – stop the spindle: switch back to normal –
and set the new cutting depth and restart the machine; repeat this
procedure until the thread is cut.
Mounted on a ‘V’ machined slide on the saddle. The accuracy of the fit of
the ‘V’ slide is maintained by the ‘gybe’ strips set in the offside of the
traverse slide.
Traverse slide
control handle
A ’U’ handle, mounted on a shaft that is anchored into a housing cast at
the front of the traverse slide, the shaft is threaded and is engaged in a
fixed thread follower on the slide, enabling the traverse slide to be driven
back and forth across the saddle perpendicular to the main axis. There is
a graduated ring (thimble) on the neck of the handle to allow the
movement of the slide to be measured.
The compound slide is mounted on a machined ‘V’ slide with a circular
base, that is then mounted and located on the top of the traverse slide
by a central pivot. Through the circular block, near the edge, are two
diametrically opposed nuts and bolts; the bolt shanks extend through two
concentric slots machined in the traverse slide that allow the compound
slide mount to turn about the central pivot. The nuts on the ends of the
bolts (in machined recesses under the front and back edge of the slide)
also lock the compound slide along its selected axis (+ or – 45 degrees
from the main axis).
The compound slide fits over this ‘vee’ slide mount; the accuracy of the
fit is maintained by the ‘gybe’ strips set in the front edge of the
compound slide. There is a scale set on the front of the circular base to
enable the angle set on the compound slide to be measured.
Compound
slide
control handle
A ’U’ handle, mounted on a shaft that is anchored into a housing cast at
the Control Handle end of the slide; the shaft is threaded and is engaged
in a fixed thread follower on the circular mounting plate, enabling the
slide to be driven backward and forward along its axis. There is a
graduated ring (thimble) on the neck of the handle to allow the
movement of the slide to be measured.
The central locating pivot for the tool post has a threaded end which
passes through the tool post, and is fitted with a threaded boss lever
handle. Tightening down on the handle clamps the tool post firmly in
position.
A nut and bolt fitted through the tailstock and clamping dog.
Tightening the nut pulls the clamping clog up against the underside of
the bed and clamps the tailstock in position. Conversely, loosening the
nut releases the bolt and the clamp allowing the tailstock to slide freely
on the bed.
The tailstock is keyed into a large support base, and is able to be driven
backwards and forward across this base about the central axis of the
lathe. There are two opposing screws set in the base that control the
movement of tailstock, the screws have to be adjusted sequentially, i.e.
loosen, tighten, loosen, tighten, etc., to move the tailstock.
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