Glossary Of Terms - Grizzly G9901 Owner's Manual

The following is a list of common definitions, terms and phrases used throughout this manual as they relate
to this mill and metalworking in general. Become familiar with these terms for assembling, adjusting and
operating this mill. Your safety is VERY important to us at Grizzly!
Arbor: A machine shaft that supports a cutting
tool.
Collet: A conical shaped split-sleeve bushing
that holds round tools by pressing against their
outside diameter.
Cutting Speed: The distance a point on a cut-
ter moves in one minute, expressed in surface
meters or feet per minute.
Dial Indicator: An instrument used in setup and
inspection work that shows the amount of error in
size or alignment of a part.
Dividing Head: A milling machine accessory
used to divide a circular object into a number of
equal parts.
Down or Climb Milling: Feeding the workpiece
in the same or opposite direction as the cutter
rotation.
End Milling: The operation of machining flat
surfaces either horizontal, vertical, or at an angle
using an end mill as a cutter.
Face Milling: The milled surface in this method
results from the combined action of cutting edges
located on the face or end of the cutting tools.
Feed Rate: Usually measured in inches per min-
ute.
Fixture: A device that securely holds the workpiece
in place during a cutting operation.
Form Milling: The machining of irregular con-
tours by using form cutters.
Gang Milling: When more than two cutters are
mounted on the arbor to machine surfaces of a
workpiece.
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Glossary of Terms

Gib: A tapered wedge located along a sliding
member to take up wear or to ensure a proper fit.
Headstock: The mill component that houses the
vertical spindle, motor, and drive system.
Knee: The mill device that the saddle and table
are mounted on, which can move along the Z-axis
path.
Lead Screw: The device that moves the table
along the X-axis, Y-axis, and Z-axis paths.
Peripheral Milling: The milled surface in this
method is produced by cutting teeth located on
the periphery (outer edge) of the cutter body.
Ram: The mill component that holds the head-
stock and moves in a linear path across the col-
umn.
Saddle: The sliding component that holds the
table and moves along the Y-axis path.
Side Milling: The operation of machining a verti-
cal surface on the side of a workpiece using a
side milling cutter.
Slitting and Cutting Off: Metal slitting saws are
used for milling narrow slots and for cutting off
stock.
Spindle: The revolving hollow shaft that holds
and drives the tool holder or arbor.
Turret: The top part of the column that the ram
rotates on.
Ways: The precision machined and flat tracks
on the mill on which the table, saddle, and knee
travel.
X, Y, and Z-Axis: The straight path the table
can travel longitudinally, crosswise, or vertically
respectively.
Model G9901/G9902/G9903 Milling Machine