Southbend SB1059F owner manual Power Feed, Setting Spindle Speed

EVS Toolroom Lathe w/DRO O P E R A T I O N For Machines Mfg. Since 3/11

Setting Spindle Speed

1.Make sure the spindle is turned OFF and it has come to a complete stop.

2.Use the chart in Figure 65 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 65. Spindle speed ranges.

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 66 all the way counterclockwise to set it to the minimum speed.

Spindle Speed	Spindle Speed Dial
RPM Display

Figure 66. EVS spindle speed controls.

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.

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.

5.Turn the spindle ON, and slowly turn the spindle speed dial to your calculated spindle speed.

Power Feed

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.

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