Tools With A Relevant Tool Point Direction; 1/2 D Tool Radius Compensation - Siemens SINUMERIK 840D sl Function Manual

2.5.14

Tools with a relevant tool point direction

The following must be observed for tools with relevant cutting edge position:
● The straight line between the tool edge center points at the block start and block end is used
to calculate intersection points with the approach and retraction block. The difference
between the tool edge reference point and the tool edge center point is superimposed on
this movement.
For approach and/or retraction with KONT, the movement is superimposed in the linear
subblock of the approach or retraction movement. Therefore, the geometric conditions for
tools with or without relevant cutting edge position are identical.
● In circle blocks and in motion blocks containing rational polynomials with a denominator
degree > 4, it is not permitted to change a tool with active tool radius compensation in cases
where the distance between the tool edge center point and the tool edge reference point
changes. With other types of interpolation, it is now possible to change when a
transformation is active (e.g. TRANSMIT).
● For tool radius compensation with variable tool orientation, the transformation from the tool
edge reference point to the tool edge center point can no longer be performed by means of
a simple zero offset. Tools with a relevant cutting edge position are therefore not permitted
for 3D peripheral milling (an alarm is output).
Note
The subject is irrelevant with respect to face milling as only defined tool types without
relevant cutting edge position are permitted for this operation anyway. (A tool with a type,
which has not been explicitly approved, is treated as a ball end mill with the specified radius.
A cutting edge position parameter is ignored).
2.6

2 1/2 D tool radius compensation

The 2½ D tool radius compensation should be used if, when machining inclined surfaces,
the workpiece is to be rotated, and not the tool alignment. This function is activated using
commands CUT2D, CUT2DD, CUT2DF oder CUT2DFD.
Tool length offset
The tool length compensation is always taken into account referred to the machining plane that
is not rotated and is fixed in space.
2½ D tool radius compensation for contour tools
2½ D tool radius compensation for contour tools is activated, if, together with CUT2D, CUT2DD,
CUT2DF or CUT2DFD, one of the two commands G41 (tool radius compensation left of the
contour) or G42 (tool radius compensation right of the contour) is programmed. It is used for
automatic cutting-edge selection in the case of non-axially symmetrical tools that can be used
for piece-by-piece machining of individual contour segments.
Note
If 2½ D tool radius compensation is not activated, a contour tool behaves like a standard tool,
which only has the first cutting edge.
Tools
Function Manual, 06/2019, A5E47435126B AA
W1: Tool offset
2.6 2 1/2 D tool radius compensation
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