Setting Spindle Speed - Grizzly G0836 Owner's Manual

Removing Tooling
Tools Needed
Hex Wrenches, 3mm and 8mm ......................... 1
Spindle Spanner Wrench .................................. 1
Brass-Head or Dead-Blow Hammer .................. 1
To remove tooling:
1. DISCONNECT MACHINE FROM POWER!
2. Remove (3) cap screws securing drawbar
cap to headstock.
3. Use spindle spanner wrench and 8mm hex
wrench to loosen drawbar one full turn only.
DO NOT completely unscrew drawbar
before striking it with hammer in following
step. You will damage threads on drawbar
and arbor.
4. Tap top of drawbar with brass-head or dead-
blow hammer to unseat taper, as shown in
Figure 34.
Figure 34. Using hammer to loosen drawbar.
5.
Hold onto tooling with one hand and fully
unthread drawbar with other hand.
Model G0836 (Mfd. Since 09/17)
Qty
Drawbar
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 determine the best spindle speed for
the cutting task, and adjust the spindle speed dial
to the required 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 in the formula shown in
Figure 35.
*
Recommended
Cutting Speed (FPM) x 12
Tool Dia. (in inches) x 3.14
*
Double if using carbide cutting tool
Figure 35. 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.
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, 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 many spindle-speed calculators on
the internet. These sources will help you consider
the applicable variables in order to determine the
best spindle speed for the operation.
Spindle
=
Speed
(RPM)
-29-