Tools With A Relevant Tool Point Direction; Tool Radius Compensation 2D (Trc); General - Siemens SINUMERIK 840D sl Function Manual

W1: Tool offset

18.5 Tool radius compensation 2D (TRC)

18.4.10

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).
18.5 Tool radius compensation 2D (TRC)
18.5.1

General

Note
For tool radius compensation (TRC) see:
References:
Programming Manual Fundamentals
Only the Programming Guide contains a complete technical description of the tool radius
compensation (TRC) and its special aspects.
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions