Southbend SB1001 owner manual Manual Feed, Spindle Speed

Model SB1001 8K™ Lathe O P E R A T I O N For Machines Mfg. Since 8/11

Manual Feed

The handwheel and ball handles shown in Figure 45 allow the operator to manually move the cutting tool.

Compound Rest

Ball Handle

Cross Slide

Ball Handle

Carriage

Handwheel

Figure 45. Carriage component manual feed controls.

Carriage Handwheel

Graduated Dial
Increments	0.02"
One Full Revolution	0.10"

Use the carriage handwheel to move the carriage left or right along the bedway.

Cross Slide Ball Handle

Graduated Dial
Increments	0.001"
One Full Revolution	0.050"

Use the cross slide ball handle to move the tool toward and away from the work. Adjust the position of the graduated dial by holding the handwheel with one hand and turning the dial with the other.

Compound Rest Ball Handle

Graduated Dial
Increments	0.001"
One Full Revolution	0.050"

Use the compound rest ball handle to move the cutting tool linearly along the set angle of the compound rest. The compound rest angle is set by hand-rotating it and securing it in place with two hex nuts.

Spindle Speed

Using the correct spindle speed is important for safe and satisfactory results, as well as maximizing tool life.

To set the spindle speed for your operation, you will need to: 1) Determine the best spindle speed for the cutting task, and 2) configure the lathe controls to produce the required spindle speed.

Determining Spindle Speed

Many variables affect the optimum spindle speed to use for any given operation, but the two most important are the recommended cutting speed for the workpiece material and the diameter of the cut, as noted in the formula shown in Figure 46.

*Recommended

Cutting Speed (FPM) x 12

= SpindleSpeed (RPM)

Dia. of Cut (in inches) x 3.14

*Double if using carbide cutting tool

Figure 46. Spindle speed formula for lathes.

Cutting speed, typically defined in feet per minute (FPM), is the speed at which the edge of a tool moves across the material surface.

A recommended cutting speed is an ideal speed for cutting a type of material in order to produce the desired finish and optimize tool life.

The books Machinery’s Handbook or Machine Shop Practice, and some internet sites, provide excellent recommendations for which cutting speeds to use when calculating the spindle speed. These sources also provide a wealth of additional information about the variables that affect cutting speed and they are a good educational resource.

Also, there are a large number of easy-to-use spindle speed calculators that can be found on the internet. These sources will help you take into account the applicable variables in order to determine the best spindle speed for the operation.

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