Grizzly G0894 Owner's Manual page 9

Form Bit: A bit that carves a standard profile such
as a roundover, ogee, or similar contour.
Gantry: The structure that straddles the bed and
carries the spindle. It moves the full length of
the bed along the Y-axis.
G-Code: A machine language that uses axis
points and commands, which the machine
uses to move and perform functions.
Hold-Down: A clamp used to firmly hold a
workpiece or fixture to the table.
Home Position: A fixed point on the machine set
with proximity switches. It is the machine zero
point on all axes.
Letter Address: The first letter of a G-code
command. Commands with similar functions
are usually grouped within the same letter
address. For example, the "G" letter address
deals with preparatory functions that define
the machine's operation, while the "M" let-
ter address handles miscellaneous machine
functions such as turning on spindles, pumps,
and other auxiliary tasks.
Origin: User designated zero point for a workpiece
from which the router will reference the posi-
tioning of all cutting.
Plunge: The distance on the Z-axis that the
spindle and cutting tool moves toward, into,
or along the workpiece.
Pocket Toolpath: A toolpath that creates a cavity
in the horizontal surface of a workpiece.
Post Processor: A software function that formats
G-code into a dialect understood by a specific
machine.
Profile Toolpath: A toolpath that cuts along the
profile of a set of vectors. Typically used to
cut out the shape of a design.
Proximity Switch: A magnetic limit switch that is
used to find home position.
Rapid: The maximum speed of each axis. Higher
rapid rates decrease machining times.
Model G0894 (Mfd. Since 05/19)
Rough Cut: A 3D toolpath where the initial cut is
designed to remove unwanted material, leav-
ing a rough contour.
Soft Limits: Axis limits imposed by the work space
boundaries and based on controller settings
and the location of home. An "out of soft limits
error" implies that there is not enough room to
move in a designated direction based on the
positioning of the workpiece.
Spindle Speed: Rotational speed of cutting tool
(RPM).
Spoilboard: Sacrificial material placed under the
workpiece that allows the cutting tool to go
past the workpiece to ensure a full, clean
cut without damaging the work table. Usually
made of MDF.
Stepper Motor: DC motor that moves in precise
steps when pulses are received. Has very
accurate positioning and speed control.
Surfacing: The process of leveling the surface of
a workpiece or spoilboard so it is perpendicu-
lar to the spindle.
Toolpath: User defined route that the cutter fol-
lows to machine a workpiece.
Tool Setter: A device used to set the zero point
(origin) for the Z-axis.
Up-Cut Bit: A cutting tool with edges that carve
upward on the face of the toolpath. This
removes chips from the material, but can pull
the material off the bed and splinter the top
edge.
VFD: Variable frequency drive that controls the
speed (RPM) of the spindle. Enables the fine
tuning of the spindle during the operation of
a toolpath.
Working Envelope: The three-dimensional area
that the spindle can travel within while cutting
or milling.
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