Siemens Sinumerik 840D sl Programming Manual page 210

Glossary
Teach-in
Teach-in is a means of creating and correcting part programs. The individual program blocks
can be input via the keyboard and executed immediately. The positions approached with the
direction keys or the handwheel can also be stored. Additional information such as G
functions, feedrates or M functions can be entered in the same block.
Tool
A tool that is used to shape a workpiece. Tools are e.g. turning tools, milling cutters, twist
drills, laser beams, grinding wheels etc.
Tool offset
A tool is selected by programming a T function (5 digits, integer) in the block. Every T
number can be assigned up to 9 cutting edges (D addresses). The number of tools that are
managed in the control system can be parameterized.
The tool length compensation is selected by programming D numbers.
Tool radius compensation
A contour is programmed on the basis of the assumption that a tool is used with a tool tip. As
this is not always the case in practice, the radius of curvature of the used tool is specified so
that an allowance is considered by the tool. The center of curvature is guided to the contour
which is equidistant with an offset that corresponds to the radius of curvature.
Transformation
If programming is done in one Cartesian coordinate system and execution is done in another
non-Cartesian coordinate system (e.g. with machine axis as rotary axis); then inclined axes
and 5-axis transformation are used in connection with transmit.
Transmit
This function can be used to mill outside contours on rotating parts, e.g. four-sided parts
(linear axis with rotary axis).
3D interpolation with two linear axes and one rotary axis is also possible. The advantages of
Transmit simplify programming and improves the efficacy of the machine through complete
machining: Turning and milling can be executed on the same machine without rechucking.
Traversing range
The maximum possible traversing range for linear axes is ± 9 decades. The absolute value
depends on the selected resolution for the inputting and position control, and on the used
unit of measurement (inch or metric).
User interface
The user interface (UI) is the man-machine interface (HMI) of a CNC. It appears on the
screen and has eight horizontal and eight vertical softkeys.
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Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling