Model G0781 (Mfd. Since 2/15)
-21-
Spindle Speed
Cutting Speed (FPM) x 12
*Recommended
Tool Dia. (in inches) x 3.14
=
Spindle
Speed
(RPM)
*Double if using carbide cutting tool
Figure 12. Formula for determining best spindle
speed.
Determining Spindle Speed
Setting Spindle Speed
1. Rotate variable-speed dial counterclockwise
to "0" to set spindle speed at lowest value.
2. Rotate speed range lever (see Figure 13) to
either “LOW” (spindle speeds 50–1000 RPM)
or “HIGH” (spindle speeds 100–2000 RPM).
Note: When switching between speed rang-
es, it may be necessary to rotate spindle by
hand so gears will align and engage.
3. Turn spindle direction switch to either "FOR"
(clockwise rotation), or "REV" (counterclock-
wise rotation), and press ON button.
4. While watching RPM display, rotate variable-
speed dial clockwise until desired RPM is
reached.
Figure 13. Speed range lever location.
Speed Range
Lever
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
cutting tool, as noted below.
Using the correct spindle speed is important for
safe and satisfactory results
, as well as maximiz-
ing 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 spindle
controls to match the closest spindle speed.
Cutting speed, typically defined in feet per minute
(FPM), is the speed at which the edge of a tool
moves across the material surface.
The "R
ecommended Cutting Speed"
varies
depending on the type of workpiece material. It is
the
ideal speed for cutting that material
in order to
optimize tool life
and produce a desirable finish.
Machinery’s Handbook or
, and some internet sites, pro-
vide excellent recommendations for which cutting
speeds to use when calculating the spindle speed.
The
se 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 all applicable variables to determine the
best spindle speed for the operation.
To Next Page
Loading...
Need help?
General
