Southbend SB1012 User Manual

For Machines Mfg. Since 7/09

EVS Toolroom Lathes

-43-

You can manually move the cutting tool around 
the lathe for facing or turning operations using 
the handwheels shown in Figure 77 and 
described below.

The carriage handwheel moves the carriage left 
or right along the bed. Use this control when 
setting up the machine for facing or turning.

The cross slide handwheel moves the tool toward 
and away from the work. Turning the dial 
clockwise moves the slide toward the workpiece. 
Adjust the graduated scale by holding the 
handwheel with one hand and turning the dial 
with the other. The graduated scale reads in 
0.001" increments and is a "direct-read" which 
means that the distace on the collar reflects 
the amount removed from the diamter of the 
workpiece.

The compound slide handwheel controls the 
position of the cutting tool relative to the 
workpiece. The compound is adjustable for any 
angle within its range. Angle adjustment is 
secured by two nuts on the base of the compound. 
The graduated scale reads in 0.001" increments 
and is a "indirect-read" which means that the 
distace on the collar reflects the distance that the 
tool moves.

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 operations, 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 78:

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. All of these sources will help you 
take into account all the applicable variables in 
order to determine the best spindle speed for the 
operation.

Double if using carbide cutting tool