Southbend Turn-nado Gearhead Lathe w/ Dro 21" x 60" sb1046pf - Manual (Page 56)

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For Machines Mfg. Since 3/11 Turn-Nado ® Gearhead Lathes O P E R A T I O N
Setting Spindle Speed
1. Make sure the spindle is turned OFF and it
has come to a complete stop.
2. Find the spindle speed range in the following
options that is closest to your calculated
spindle speed:
— 20, 25, 35, and 50 RPM
— 65, 85, 115, and 150 RPM
— 210, 280, 380, and 500 RPM
— 670, 900, 1200, and 1600 RPM
3. Move the spindle speed range lever (see
Figure 66) so that the colors of the selected
spindle speed range align with those of the
stationary plate.
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 alternatively 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 59.
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.
Figure 66. Spindle speed of 1600 RPM is selected.
Stationary
Plate
Spindle Speed
Range Lever
Spindle Speed
Lever
4. Move the spindle speed lever to align the
arrow on the inner hub with the same color
as your selected speed on the outer hub.