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G9729 Combination Lathe/Mill
Apron
The longitudinal motion of the apron is controlled
by the lower handwheel (Figure 28) on the face
of the apron or the hand crank at the end of the
lathe bed. The handwheel will be used most often,
but when the hand crank is used, remember that
the half nut must be engaged and the crank must
be pushed in before it will move the apron. The
motion of this slide is used when cutting along
the length of a workpiece. This slide can also be
operated with the power feed feature.
Figure 28. Carriage handwheels.
Graduated Dials
Each dial can be rotated without turning the hand
crank. This is helpful because the dial can be set
to zero after the tool bit touches the part. The
graduated dial can be adjusted by holding the
hand crank with one hand and turning the dial
with the other.
Figure 27. Changing the angle on the
compound slide.
The lathe has 3 handles for manual control of the
tool bit during machining operations.
Compound Slide
This slide is adjustable so that cuts may be pro-
duced with an angle. By loosening the bolts at
the swivel base as shown in Figure 27, the com-
p
ound may pivot to any angle relative to the turn-
i
ng axis of the lathe spindle. This feature allows
tapered cuts to be produced on a workpiece.
Cross Slide
This handwheel moves the compound slide
across the lathe bed (see Figure 28). Turning
the
dial clockwise moves the slide away from
the operator. The motion of this slide is used for
facing a workpiece and when advancing a cut
for reducing a diameter. The dial has 100 divi-
sions
with each mark representing 0.001" (one
thousandths of an inch) of motion for the slide.
The label above the dial reports that each line
represents 0.002" Ø. It is best to think of this as
the amount of reduction in diameter on the part,
per mark on the dial. Therefore, rotating the dial
10 marks will move the slide 0.010", and multi-
plying
this amount by 0.002" equals 0.020". The
workpiece diameter will be reduced by 0.020".
Carriage Controls
Cross Slide Handwheel Apron Handwheel