Model SB1016/SB1036 | O P E R A T I O N | For Machines Mfg. Since 7/09 |
Power Feed
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 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:
ssWhen the apron feed direction knob is
ssWhen the apron feed direction knob is pulled- 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.
FORWARD |
NEUTRAL |
REVERSE |
Figure 89. Headstock feed direction lever.
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.
Feed Direction
Knob
Feed Selection Knob
Figure 90. Apron feed knobs.
The apron feed direction knob and the headstock feed direction lever reverse the feed direction of each other. Before and after power feed operations,
