Distance to go The remaining amount of movement specified in a block.
Distribution amount Number of pulses to be distributed during pulse distribution.
DNC operation Automatic operation based on a program being loaded into the CNC via an inter-
face. In this operation, the program to be loaded can be specified, and the CNC
can be operated based on the specified execution sequence and a specified
Drilling mode Mode in which a hole can be machined.
Dry run Operation for program testing with no workpiece attached. A feedrate can be
selected manually to override a programmed feedrate.
Dwell Deferring the execution of the next block by a specified period.
Dynamic graphic display Drawing a programmed tool path and a target figure on the CNC screen.
Each–block calling Unconditionally calling a specified custom macro program for each individual
CNC command block.
EDIT mode CNC state in which programs can be edited.
Editing unit Minimum unit in which program editing, such as deletion, can be performed.
Usually the editing unit begins at one address and ends jut before the next
EIA code Information exchange code complying with EIA standard EIA–244–B (abolished
in July, 1992). Used in numerical control.
Emergency stop Entering an emergency stop signal to the CNC to cancel all commands, thereby
bringing the machine to an immediate stop.
End of block code (EOB) Code (character) that signifies the end of a block.
End of program Miscellaneous function indicating the end of a main program. (M02,M30)
End of record (EOR) Code that signifies the end of a program. This code is displayed as a percent
symbol ( % ) on the CNC program screen.
End of subprogram Miscellaneous function indicating the end of a subprogram. (M99)
Error code Number assigned to a classified alarm
Exact stop mode Operation mode in which the tool is decelerated at the end of a block. The next
block is not started until after it has been confirmed that the tool is in an in–posi-
Exponential interpolation Changing the rotation of a workpiece exponentially as the rotary axis moves, and
performing linear interpolation between that axis and another. Used for tapered
grooving with a constant spiral angle.
Extended part program editing CNC program editing, such as copying or moving an individual CNC program,
or connecting it to another CNC program.
External I/O device Device connected to the CNC to transfer programs and tool offset data with the
External motion function Outputting a signal (external operation function signal) from the CNC each time
a block in a program finishes positioning, causing the machine to perform a spe-
External workpiece origin offset value Offset value from the machine zero point used to offset the workpiece coordinate
system origin. There is only one external workpiece origin offset value, common
to all workpiece coordinate systems, while the workpiece origin offset value is
provided for each individual workpiece coordinate system.
F code Coded number, following the F address, that specifies a feedrate or an amount
of feed relative to a workpiece.
Feed function Controlling the tool feedrate.
Feed hold Temporarily stopping feed during program execution.