Spindle Speed - Grizzly G0810 Owner's Manual

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 31. Spindle speed formula for milling.
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 G0810 (Mfd. Since 10/15)
Setting Spindle Speed
The Model G0810 has twelve spindle speeds,
which are selected by positioning the V-belts in
various configurations on the pulleys.
Tools Needed
Wrench or Socket 12mm ................................... 1
To set spindle speed:
1.
2.
3.
Spindle
=
Speed
(RPM)
4.
DISCONNECT MACHINE FROM POWER!
Open V-belt cover.
Support motor with one hand and loosen
motor lock shown in Figure 32.
Spindle Idler Pulley &
Pulley Pivot Arm
Motor
Lock
Figure 32. Location of V-belts and pulleys.
Press motor toward front of headstock to
release tension on motor V-belt, then tighten
motor lock to prevent it from re-tensioning
belt.
Qty
Motor
Pulley
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