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Model G0602/G0752 (Mfg. Since 11/12)
Use a low RPM when machining
heavy eccentric workpieces;
securely clamp your workpiece
and remove the chuck key!
Objects thrown from a lathe can
cause serious injury or death to
the operator or bystanders.
Use a minimum of three independent clamping
devices when turning eccentric workpieces
on the faceplate. Failure to provide adequate
clamping will cause workpiece to eject.
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 lathe
controls 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 workpiece, as noted in the formula shown in
Figure 54.
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
Dia. of Cut (in inches) x 3.14
Spindle
Speed
(RPM)
*Double if using carbide cutting tool
=
Figure 54. Spindle speed formula for lathes.
Setting Spindle Speed
Selecting one of the available six spindle speeds
(Model G0602) or one of the three spindle speed
ranges (Model G0752) is performed by reposition-
ing the V-belt(s) between the pulleys.
Tools Needed Qty
Hex Wrench 5mm .............................................. 1
Hex Wrench 8mm .............................................. 1
Open-End Wrench 17mm .................................. 1
G0602 Configuration Examples
The 27
1
⁄2" belt is used on pulleys B and C (see
Figure 55) with the tensioner for 50, 300, and
560 RPM.
Figure 55. Positioning belt for low speed.
Tensioner
Used
A
B
C