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Setting
Spindle Speed
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.
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
cutting tool, as noted below.
*
Recommended
Cutting Speed (FPM) x 12
Tool Dia. (in inches) x 3.14
*
Double if using carbide cutting tool
Figure 36. Spindle speed formula for mill/drills.
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 "Recommended 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.
The books Machinery's Handbook or Machine
Shop Practice, and some internet sites, pro-
vide 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 all applicable variables to determine the
best spindle speed for the operation.
Model G8689Z (Mfd. Since 07/23)
Setting Spindle Speed
The Model G8689Z has two spindle speed rang-
es: a low speed range that spans from 0–1100
RPM and a high speed range that spans from
0–2500 RPM.
To set spindle speed range:
1.
DO NOT attempt to change speed range
until spindle has come to complete stop, or
spindle gearing will be damaged.
2.
Spindle
=
Speed
(RPM)
3.
Rotate spindle speed dial completely coun-
terclockwise and wait for spindle to com-
pletely stop.
Move speed range lever to desired speed
range (see Figure 37).
Note: If speed range lever will not go into
gear, rotate spindle by hand while holding
light pressure on lever. When gears engage,
lever will slip into place.
Figure 37. Location of speed range lever.
Move ON/OFF toggle switch to ON position,
then turn spindle speed dial clockwise to
desired speed.
Note: Spindle speed dial must be rotated all
the way counterclockwise to reset spindle
power after Emergency Stop button has been
used or ON/OFF toggle switch has been
moved to OFF position.
Speed Range
Lever
-27-
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