Grizzly G0751, Руководство пользователя

Страница: 30 / 64

-28-
Model G0751 (Mfg. Since 1/13)
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 operation, and 2) configure the spindle
speed levers to produce the required 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 in the formula shown in
Figure 22.
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 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 the applicable variables in order to deter-
mine the best spindle speed for the operation.
Cutting Speed (FPM) x 12
*
Recommended
Tool Dia. (in inches) x 3.14
=
Spindle
Speed
(RPM)
*
Double if using carbide cutting tool
Figure 22. spindle speed formula for mill/drills.
Spindle Speed
Setting Spindle Speed
the chart below explains how to position the
spindle range and speed levers to set the desired
spindle speed.
Spindle Speed Range Lever Speed Lever
90 rpM L 1
210 rpM L 2
345 rpM L 3
670 rpM h 1
1180 rpM h 2
1970 rpM h 3
Change spindle speed ONLY when the
spindle is completely stopped. Otherwise,
machine damage could occur.
With the spindle completely stopped, position the
spindle range and speed levers (see
Figure 23)
to set the spindle speed.
Note: If the levers will not move to the desired
position, rotate the spindle by hand while applying
pressure on the lever. When the gear teeth align,
the lever will move into place.
Figure 23. spindle speed controls.
range
Lever
speed
Lever
spindle speed Chart