Southbend SB1059F User Manual

For Machines Mfg. Since 3/11

EVS Toolroom Lathe w/DRO

-53-

The handwheels shown in Figure 63 allow the 
operator to manually move the cutting tool.

The carriage handwheel moves the carriage left 
or right along the bed. It has a graduated dial 
with 0.01" increments, and one full revolution 
moves the carriage 0.80". Pull the handwheel out 
to disengage it during power feed operations—
this will prevent entanglement hazards.

The cross slide handwheel moves the tool 
toward and away from the work. Adjust the 
position of the graduated scale by holding the 
handwheel with one hand and turning the dial 
with the other. The cross slide handwheel has 
a direct-read graduated dial, which shows the 
total amount of material removed from the 
diameter of the workpiece (i.e., half the amount 
of tool movement). The dial has 0.001" (0.02mm) 
increments, and one full revolution moves the 
slide 0.100" (5.08mm). Rotate the dial collar 180° 
to read in metric units.

The compound rest handwheel moves the cutting 
tool linearly along the set angle of the compound 
rest. The compound rest angle is set by hand-
rotating it and securing in place with two hex 
nuts. The compound rest has an indirect-read 
graduated dial with 0.001" (0.02mm) increments. 
One full revolution of the handwheel moves the 
slide 0.100" (2.54mm). Rotate the dial collar 180° 
to read in metric units.

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.

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 workpiece, as noted in the formula shown in 
Figure 64.

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.

Double if using carbide cutting tool