High–speed remote buffer B High–speed remote buffer for supplying movement data as source code created
in an automatic programming unit.
HPCC mode Mode in which high–precision contour control (HPCC) is performed.
Hypothetical axis interpolation Distributing pulses by using one of circular interpolation axes as a hypothetical
axis, thereby varying the feedrate of the controlled axis sinusoidally.
I/O channel Channel used to transfer data between input/output devices and the CNC.
Imaginary tool note Point defined on an imaginary axial straight line extending from the tip of a tool.
This makes it easier to set the tool to its start position or reference position.
In–position State in which a servo motor is positioned to a point within a specified range (pre-
viously set in the CNC).
Inch threading Precise threading in which the number of thread crests per inch is specified.
Inch/metric switching Selecting whether data is to be input in inch or metric units.
Increment system Generic term for least input increment and least command increment.
Incremental feed Feeding a controlled axis by a preset amount each time the corresponding but-
ton is pressed.
Incremental programming Method by which an amount of tool movement (relative to the previous tool posi-
tion) is programmed.
Incremental value Distance or angle relative to the previous position.
Index table indexing function Indexing on the index table of a machining center.
Initial position Level in a hole axial direction to which positioning is performed for the first time
during a canned hole machining cycle. Succeeding drills return to the R Plane.
Input buffer Area into which input data is temporarily saved.
Interference check Preventing a tool from overcutting the workpiece or from striking the tool on the
other tool post.
Interlock Preventing the movement of a controlled axis. This function is enabled by sup-
plying an interlock signal to the CNC.
Internal circular cutting feedrate change Controlling circular cutting so that the feedrate for a programmed path matches
the specified cutting feedrate when the actual tool path is offset within the pro-
grammed tool path.
Interpolation functions Obtaining a tool path according to a function (such as a linear or arc function) cor-
responding to a specified preparatory function.
Interruption type custom macro Calling a program to be executed by entering an interrupt signal to the CNC dur-
ing the execution of another program.
Inverse time feed Cutting feed for which the reciprocal of the time required to feed the tool is speci-
Involute interpolation Determining the path necessary to move the tool along an involute curve in a
ISO code Information exchange code complying with the applicable ISO standard. Used
in numerical control.
Jog feed Manually feeding a specified controlled axis at a specified feedrate.
Jog feedrate override Manual control in which the operator can change the jog feedrate.
Lag of servo system State in which the feed axis of a machine lags behind the corresponding feed