Southbend SB1001 - Manual (Page 40)

-38-
For Machines Mfg. Since 8/11 Model SB1001 8K ™ Lathe O P E R A T I O N
Manual Feed
The handwheel and ball handles shown in
Figure 45 allow the operator to manually move
the cutting tool.
Figure 45. Carriage component manual feed controls.
Carriage
Handwheel
Cross Slide
Ball Handle
Compound Rest
Ball Handle
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.
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.
Cutting Speed (FPM) x 12
*
Recommended
Dia. of Cut (in inches) x 3.14
= SpindleSpeed (RPM)
*
Double if using carbide cutting tool
Figure 46. Spindle speed formula for lathes.