Retrace function Causing a tool to move back along a path which it previously traversed
(reverse), then retracing the same path again (re–forward).
Retract Automatic operation in which the tool is retracted by a programmed amount.
Return point level
Level to which a tool is retracted from the bottom of a hole being created dur-
ing the execution of a canned cycle. This is either the point R level or initial
Rewinding a program Locating the beginning of a program.
Rigid tapping High–precision tapping achieved by controlling spindle rotation and drill axis
feed as two–axis linear interpolation so that no tapping pitch error occurs at
the bottom of the hole during acceleration/deceleration.
Rotary axis Axis (such as A, B, or C) that rotates about a linear axis in a machine.
Rotary axis roll–over function Rounding off a rotary axis coordinate to within 360.
Rotary table dynamic fixture offset Automatically calculating an offset from a rotation center when the rotary table
rotates, thereby defining a workpiece coordinate system.
Rotational copy Repetitive machining performed by rotating a subprogram–specified shape.
Rotational handle feed around tool tip Manually feeding a tool using a handle in such a way that, when the tool
direction is changed, the tool tip is held in the same position.
RS–232–C EIA standard specifying a binary serial data interface for input/output devices.
RS–422 EIA standard specifying a binary serial data interface for input/output devices.
S code Coded number, following the S address, that specifies the rotational speed of
S function Controlling the rotational speed of the spindle by specifying a number after
the S address.
Scaling Reducing or enlarging a programmed figure, using a specified point as the
Scheduling function Selecting a file on an external input/output floppy device, so that automatic
operation is performed based on the specified execution sequence and speci-
fied execution count.
Second auxiliary function Auxiliary function for specifying a function such as indexing table positioning.
Selecting a workpiece coordinate sys-
Selecting a workpiece coordinate system from those set in the CNC.
Self–diagnosis function Failure diagnostic function provided for the CNC. This function identifies
mechanical, electrical, and human errors.
Sequence number A number preceded by the N address and placed at the beginning of a pro-
gram block to identify a specific block.(need not be sequential)
Sequence number comparison and stop Searching for a block identified by a specified sequence number during pro-
gram execution, executing the target block (if found), and then stopping auto-
Sequence number search Searching a program for the block identified by a specified sequence number
and selecting that block.
Serial pulse coder Rotary detector that encodes a detected position as serial data prior to trans-