Southbend South Bend SB1051 - Manual (Page 51)

For Machines Mfg. Since 5/11 13" x 40" Heavy 13 ® EVS Lathe
-49-
O P E R A T I O N
Setting Spindle Speed
Setting the spindle speed requires positioning
the spindle speed range lever to either the high
or low range, then using the spindle speed dial
to set the speed, using the digital readout as a
guide.
Figure 64. Spindle speed controls.
Spindle Speed
Range Lever
Spindle
Speed Dial
Digital
Readout
To set the spindle speed:
1. Press the STOP button and make sure the
spindle is at a complete stop.
2. Rotate the spindle speed range lever (see
Figure 64) to select the spindle speed range.
— High Range (500–3000 RPM): Rotate the
lever to the left.
— Low Range (100–500 RPM): Rotate the
lever to the right.
Note: If necessary, rock the spindle back
and forth by hand to aid in meshing the
headstock gears as you rotate the lever.
3. Rotate the spindle speed dial on the control
panel all the way counterclockwise to set it
at the minimum speed for startup.
4. Reset the STOP button and start spindle
rotation.
5. Rotate the spindle speed dial slowly
clockwise until the spindle has reached the
desired speed, as displayed in the digital
readout on top of the headstock.
Both the carriage and cross slide have power feed
capability when the carriage is engaged with the
feed rod. The rate that these components move
(feed rate) is controlled by the headstock and
quick-change gearbox lever positions, and the
end gear configuration.
Feed rate and spindle speed must be considered
together. Keep in mind that the feed rate is
expressed in the amount of travel per revolution
of the spindle. 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 alternately be driven by the
leadscrew for threading operations. However,
this section only covers the use of the power
feed option for the carriage and cross slide
components for non-threading operations. To
learn how to power the carriage for threading
operations, refer to Threading on Page 54.
Power Feed
Operating the lathe at spindle speeds higher
than 350 RPM when the high (H) gearbox
range is selected could result in gearbox
damage. Always use spindle speeds of
350 RPM or lower when using the high (H)
gearbox range.