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-54-
For Machines Mfg. Since 3/11
Turn-Nado
®
EVS Lathes
OPERATION
Setting Spindle Speed
5. Turn the spindle ON, and slowly turn the
spindle speed dial to your calculated spindle
speed.
3. Move the spindle speed range lever to the
range that covers your calculated spindle
speed.
Note: To shift the spindle speed range lever, you
may need to rock the chuck by hand to get
the gears to mesh.
4. Turn the spindle speed dial shown in Figure
67 all the way counterclockwise to set it to
the minimum speed.
1. Make sure the spindle is turned OFF and it
has come to a complete stop.
2. Use the chart in Figure 66 to determine the
available spindle speed range that includes
your calculated spindle speed.
SPINDLE SPEED RANGES RPM
Low Speed Range 1 18–55
Medium Speed Range 2 55–180
Medium-High Speed Range 3 180–600
High Speed Range 4 600–1800
Figure 66. Spindle speed ranges.
Figure 67. EVS spindle speed controls.
Spindle Speed Dial
Spindle Speed
RPM Display
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 could result in gearbox damage
when the high (H) gearbox range is selected.
Always use spindle speeds of 350 RPM or
lower when using a high gearbox range.
Always make sure the variable speed dial is
turned all the way down (counterclockwise)
before starting spindle rotation. This will help
the operator remain in better control if spindle
rotation must be stopped immediately after
start-up for emergency reasons.