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Rotating the Ram
1.
DISCONNECT MILL FROM POWER!
2.
Loosen the four locking bolts (see Figure
36). There are two bolts on each side of ram.
Locking Bolts
(2 of 4)
Figure 36. Ram rotation locking bolts.
3.
Push against the headstock to manually
rotate ram around the column to desired posi-
tion on rotation scale.
Note: Take care not to entangle or stretch
electrical cabling as you move ram and head.
4.
Re-tighten the four locking bolts to secure
ram in place.
Always lock the ram firmly in place after
adjusting its position. Unexpected move-
ment of the ram and head during opera-
tions could cause the cutter to bind with the
workpiece, which could result in machine or
workpiece damage.
-34-
Rotation Scale
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 mill con-
trols 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 tool diameter, as
noted in the formula shown in Figure 37.
Cutting Speed* (SFM) x 4
Tool Diameter (in inches)
* Double if using carbide cutting tool
Figure 37. Spindle speed formula for mills.
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.
Model G0726 (Mfg. Since 7/11)
= RPM
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