Tape start Symbol indicating the beginning of a program file.
Tapping mode 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.
TEACH IN HANDLE mode TEACH–IN mode where the manual operation is manual handle feed.
TEACH IN JOG mode TEACH–IN mode where the manual operation is jog feed.
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.
Test operation Confirming that a program operates as intended.
TH check Checking whether the total number of 1 bits in a character is even or odd.
Thread cutting Threading performed by feeding the tool at the cutting feedrate, per minute,
determined from spindle speeds that are read at constant intervals.
Three–dimensional coordinate conver-
Three–dimensional coordinate conversion around a rotation center axis per-
formed by specifying the center of rotation, the direction of the rotation center
axis, and rotation angle.
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 compensa-
tion include tool side compensation and leading edge compensation.
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.
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.
Three–dimensional tool compensation Offsetting a tool path by the tool offset value in a three–dimensional direction
specified in a program.
Tool direction handle feed Manually feeding a tool tilted by the rotation of a rotary axis in a direction par-
allel to the tool axis of that tool.
Tool function Specifying a tool or data related to the specific tool.
Tool length compensation Compensating for the difference in length between the tool assumed during
programming and the tool to be used for actual machining.
Tool length compensation along the tool
Tool length compensation for a tool (tool axis) that is oriented in an arbitrary
direction in three–dimensional space.
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
Tool length/workpiece origin measure-
Measuring and setting the tool length/workpiece origin offset value and setting
Tool life management function Managing the life (number of uses or age) of tools in a group and automati-
cally selecting a new tool from the same group once the life of the current tool
Tool normal direction handle feed Manually feeding a tool tilted by the rotation of a rotary axis in a direction nor-
mal to the tool axis of that tool.
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)