| T CODE | Coded number, following the T address, that specifies a tool function.
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| T COMMAND NEGLECT | Ignoring T commands. This function is enabled by supplying an ignore T
command signal to the CNC.
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| T FUNCTION | Specifying a tool or data related to the specified tool.
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| T-AXIS CONTROL | In a turret punch press machine, causing the CNC to calculate the required
amount of movement relative to the current turret position and the turret position
corresponding to a T command, thereby indexing the turret.
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| T-BOLT | Term for the bolts inserted in the T-slots of a
worktable to fasten the workpiece or work-holding
device to the table.
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| T-SLOT | The slots made in the tables of machine tools
for the square-head bolts used to clamp the
workpiece, attachments, or work-holding fixtures in
position for performing the machining operations.
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| TAILSTOCK | That part of a machine tool, such as a lathe
or cylindrical grinder which supports the end of a
workpiece with a center. It may be positioned at any
point along the way of the bed, and may be offset
from center to machine tapers.
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| TANDEM CONTROL | Control in which two motors are used to drive a single axis. This is used to
drive, for example, a table that would be too large for a single motor to supply
sufficient torque.
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| TANG | The flat on the shank of a cutting tool, such as
a drill, reamer or end mill, that fits a slot in the
spindle of a machine to keep the tool from slipping.
Also, the part of a file that fits into a handle.
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| TANGENTIAL SPEED CONSTANT CONTROL | Maintaining a constant feedrate tangential to the tool path.
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| TAP | A tool used to cut threads on the inside of a
round hole.
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| TAPE CODE | Information interchange code used for numerical control.
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| TAPE END | Symbol indicating the end of a program file.
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| TAPE START | Symbol indicating the beginning of a program file.
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| TAPER | A uniform increase or decrease in the size or
diameter of a workpiece.
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| TAPPING | The process of cutting screw threads in a
round hole with a tap (an internal thread cutting tool).
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| TAPPING MODE ?? MIXTURE OF CONTINUOUS THREADING AND ??? | Operation mode in which the tool moves to the next block without being
decelerated at the end of the current block. Cutting feedrate override and
feed hold are disable in this operation mode.
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| TEACH IN HANDLE MODE | TEACH-IN mode where the manual operation is manual handle feed.
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| TEACH IN JOG MODE | TEACH-IN mode where the manual operation is jog feed.
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| TEACH IN MODE | Mode used to store information about the position of a controlled axis,
obtained by manual operation, into the CNC memory for program creation.
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| TEMPERING | A heat-treating process to relieve the
stresses produced when hardening and to impart
certain qualities, such as toughness-, sometimes
called “drawing.”
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| TEMPLATE | A pattern or a guide for laying out or
machining to a specific shape or form.
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| TENSILE STRENGTH | The property of a metal which
resists force applied to pull it apart.
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| TEST OPERATION | Confirming that a program operates as intended.
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| TH CHECK | Checking whether the total number of 1 bits in a character is even or odd.
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| THREAD | A helical projection of uniform section on
the internal or external surface of cylinder or cone.
Also, the operation of cutting a screw thread.
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| THREAD ANGLE | The angle formed by the two sides of
the thread (or their projections) with each other.
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| THREAD AXIS | A line running lengthwise through the
center of the screw.
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| THREAD CREST | The top surface joining the two sides
of a thread.
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| THREAD CUTTING | Threading performed by feeding the tool at the cutting feedrate, per minute,
determined from spindle speeds that are read at constant intervals.
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| THREAD DEPTH | The distance between the crest and
the root of a thread.
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| THREAD MILL | Cutters used in CNC milling machines to produce internal and external threads in a workpiece.
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| THREAD PITCH | The distance from a point on one
screw thread to a corresponding point on the next
thread.
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| THREAD PITCH DIAMETER | The diameter of a screw
thread measured from the thread pitch line on one
side to the thread pitch line on the opposite side.
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| THREAD ROOT | The bottom surface joining the sides of
two adjacent threads.
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| THREE-DIMENSIONAL COORDINATE CONVERSION | Three-dimensional coordinate conversion around a rotation center axis performed
by specifying the center of rotation, the direction of the rotation center
axis, and rotation angle.
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| THREE-DIMENSIONAL CUTTER COMPENSATION | Offsetting, by the tool radius, a tool (tool axis) that is oriented in an arbitrary
direction in three-dimensional space by using a plane normal to the tool axis
as a compensation plane. Instances of three-dimensional cutter compensation
include tool side compensation and leading edge compensation.
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| THREE-DIMENSIONAL HANDLE FEED | Operation performed on a tool tilted around a rotary axis by using the manual
handle. Instances of three-dimensional handle feed include tool direction
handle feed, tool normal direction handle feed, and rotational handle feed
around the tool tip.
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| THREE-DIMENSIONAL RIGID TAPPING | Rigid tapping performed using a tool (tool axis) that is oriented in an arbitrary
direction in three-dimensional space along the tool axis.
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| THREE-DIMENSIONAL TOOL COMPENSATION | Offsetting a tool path by the tool offset value in a three-dimensional direction
specified in a program.
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| THROW | The crankpin on a crankshaft. Also, the
length of the radius of a crank, an eccentric, or a cam.
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| TOLERANCE | The allowable deviation from a standard
size.
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| TOOL CHANGER/TOOLCHANGER | The component of a CNC machining center that stores and automatically switches between multiple tools.
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| TOOL DIRECTION HANDLE FEED | Manually feeding a tool tilted by the rotation of a rotary axis in a direction parallel
to the tool axis of that tool.
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| TOOL FUNCTION | Specifying a tool or data related to the specific tool.
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| TOOL LENGTH COMPENSATION | Compensating for the difference in length between the tool assumed during
programming and the tool to be used for actual machining.
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| TOOL LENGTH COMPENSATION ALONG THE TOOL AXIS | Tool length compensation for a tool (tool axis) that is oriented in an arbitrary
direction in three-dimensional space.
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| TOOL LENGTH MEASUREMENT | Manual operation in which a reference tool and the tool to be measured are
pressed against a fixed point on the machine, one after the other, and the
difference in length between the tools is set as a tool length offset value in the
CNC.
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| TOOL LENGTH/WORKPIECE ORIGIN MEASUREMENT B | Measuring and setting the tool length/workpiece origin offset value and setting
it.
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| TOOL LIFE MANAGEMENT FUNCTION | Managing the life (number of uses or age) of tools in a group and automatically
selecting a new tool from the same group once the life of the current tool
expires.
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| TOOL NORMAL DIRECTION HANDLE FEED | Manually feeding a tool tilted by the rotation of a rotary axis in a direction normal
to the tool axis of that tool.
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| TOOL NOSE RADIUS COMPENSATION | Compensation for any difference between a programmed tool position and the
actual nose contour of a tool having a circular nose. This compensation is
performed in a direction normal to the tool path.(lathes)
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| TOOL OFFSET | Shifting a specified tool along the controlled axis.
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| TOOL OFFSET MEMORY | CNC memory used to store tool offset values.
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| TOOL OFFSET NUMBER | Number preceded by the H or D address to specify a tool offset value.
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| TOOL OFFSET VALUE | Offset value used by the tool length compensation, cutter compensation, and
tool offset functions.
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| TOOL PATH | Tool path drawn using a specific point on a cutting tool.
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| TOOL POST INTERFERENCE CHECK | Operation in which the CNC detects a command that may cause the two tool
posts of the CNC lathe to interfere with each other and stops the tool posts
before they can collide.
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| TOOL RETRACT AND RECOVER | Retracting a tool from the workpiece, allowing the tool to be exchanged during
machining (if broken) or the state of machining to be checked, and subsequently
repositioning the tool to restart machining.
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| TOOL SELECTION FUNCTION | Number that follows the T address, used to select a tool on the machine.
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| TOOL SIDE COMPENSATION | Offsetting, by the tool radius, a tool (tool axis) that is oriented in an arbitrary
direction in three-dimensional space, so that the side of the tool coincides
with the programmed tool path.
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| TOOL STEEL | A general classification for high-carbon
steel that can be heat treated to a hardness required
for metal cutting tools such as punches, drills,
taps, reamers, and so forth.
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| TRACE INTERLOCK FUNCTION | Stopping tracing control temporarily. This function is used to prevent the laser nozzle from dropping into a processed hole when it passes that hole during tracing control.
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| TRACING CONTROL | Control applied to maintain a constant distance between the workpiece surface and nozzle tip. This function is used to enable stable processing by ensuring that the focal position in the direction of the workpiece thickness remains constant.
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| TRAVERSE | One movement across the surface of the
work being machined
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| TRAVERSE INHIBIT LIMIT FUNCTION | Stopping an axis and continuing automatic operation if an absolute value
related to that axis exceeds a preset value.
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| TRUING | The act of centering or aligning a workpiece
or cutting tool so that an operation may be performed
accurately. Also, correcting the eccentricity or out ofround condition when dressing a grinding wheel.
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| TUMBLER GEARS | A pair of small lever-mounted gears
on a lathe used to engage or to change the direction of
the lead screw.
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| TURNING CENTER | Also known as a lathe, a machining center that spins a workpiece in order to cut it.
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| TV CHECK | Checking whether the total number of characters in a block (starting immediately
after an end-of-block code and ending at the next end-of-block code)
is even or odd.
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| TWIN TABLE CONTROL | Switching between synchronous, independent, and normal operation for two
or more specified axes.
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| TWO-PATH CONTROL FUNCTION | Controlling the two tool posts on the CNC lathe simultaneously and independently.
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| TWO-LIP END MILL | An end milling cutter designed
with teeth that cut to the center so that it may be used
to feed into the work like a drill.
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