-54-
For Machines Mfg. Since 7/09
Model SB1016/SB1036
O P E R A T I O N
Power Feed Controls
The headstock feed direction lever shown in
Figure 89
controls the direction the carriage
moves. However, it is important to understand
that there is a direction change relationship
between the headstock feed direction lever and
the apron feed direction knob (see
Figure 90
).
The apron feed direction knob and the headstock
feed direction lever reverse the feed direction of
each other. For example:
When the apron feed direction knob is
s
pushed-in, the direction of carriage travel
shown on the headstock feed direction lever
plate is applicable only when threading. For
feeding, the directions shown will be opposite.
When the apron feed direction knob is pulled-
s
out, the direction of carriage travel shown on
the headstock feed direction plate is accurate
only when feeding. For threading, the
directions shown will be opposite.
On this lathe, both the carriage and cross slide
have power feed capability. The power feed
system is protected by an adjustable feed rod
clutch located on the input side of the apron.
The rate that these components move (feed rate)
is controlled by how the quick change gearbox
levers are configured.
Feed rate and spindle speed must be considered
together. The sources you use to determine the
optimum spindle speed for an operation will also
provide the optimal feed rate to use with that
spindle speed. Often, the experienced machinist
will use the feeds and speeds given in their
reference charts or web calculators as a starting
point, then make minor adjustments to the feed
rate (and sometimes spindle speed) to achieve
the best results.
The carriage can also be driven by the leadscrew
for threading operations. However, this section
covers using the power feed option only for non-
threading operations. To learn how to power the
carriage for threading operations, refer to the
Threading Controls
section
Page 56
.
Power Feed
Figure 89. Headstock feed direction lever.
F
ORWARD
R
EVERSE
N
EUTRAL
The main benefit of the apron feed direction
knob shown in
Figure 90
is that it changes the
direction of the selected feed without having
to stop the lathe, and walk over and shift the
headstock feed direction lever.
The feed selection knob shown in
Figure 90
engages either the carriage or cross slide feed.
The apron feed direction knob and the
headstock feed direction lever reverse the
feed direction of each other. Before and after
power feed operations, push-in the apron
feed direction knob to the "normal position".
Otherwise, if it is left pulled out, another lathe
operator may move refer to the headstock
plate and select a feed direction selection
lever to his desired, only to suddenly realize
when feeding begins, the feed movement is
opposite what was shown causing possible
carriage crash!
Figure 90. Apron feed knobs
.
Feed Selection Knob
Feed Direction
Knob
