Spindle Speed - Grizzly G0796 Owner's Manual

Moving Ram Forward/Backward
1.
DISCONNECT MACHINE FROM POWER!
2. Loosen two lock bolts shown in Figure 31.
Adjustment
Bolt
Figure 31. Ram forward/backward movement
controls.
3. Make sure there are no obstructions to
ram travel, especially any tooling around
workpiece, then slowly rotate adjustment bolt
to move ram.
Note: Rotate bolt clockwise to move ram
away from table and counterclockwise to
move ram toward table.
4. Re-tighten lock bolts.
Always lock ram firmly in place after moving
it. Unexpected movement of ram and head
during operations could damage cutter or
workpiece.
-34-
Lock Bolts

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 32. 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 G0796/G0797 (Mfd. Since 1/18)
Spindle
=
Speed
(RPM)