Tools With A Relevant Cutting Edge Position - Siemens SINUMERIK 840D sl Programming Manual

Program code
N140 X0 Y0 G40
N150 M30
Further information
Tool radius compensation is normally active before the compensation suppression and is still
active when the compensation suppression is deactivated again. In the last traversing block
before CUTCONON, the offset point in the block end point is approached. All following blocks in
which offset suppression is active are traversed without offset. However, they are offset by the
vector from the end point of the last offset block to its offset point. These blocks can have any
type of interpolation (linear, circular, polynomial).
The deactivation block of the compensation suppression, i.e. the block that contains
CUTCONOF, is compensated normally. It starts in the offset point of the starting point. One linear
block is inserted between the end point of the previous block, i.e. the last programmed
traversing block with active CUTCONON, and this point.
Circular blocks, for which the circle plane is perpendicular to the compensation plane (vertical
circles), are treated as though they had CUTCONON programmed. This implicit activation of the
offset suppression is automatically canceled in the first traversing block that contains a
traversing motion in the offset plane and is not such a circle. Vertical circle in this sense can only
occur during circumferential milling.
2.10.8

Tools with a relevant cutting edge position

In the case of tools with a relevant tool point direction (turning and grinding tools - tool types
400-599; see Section "Sign evaluation wear"), a change from G40 to G41/G42 or vice-versa is
treated as a tool change. If a transformation is active (e.g., TRANSMIT), this leads to a
preprocessing stop (decoding stop) and hence possibly to deviations from the intended part
contour.
This original functionality changes with regard to:
1. Preprocessing stop on TRANSMIT
2. Calculation of intersection points at approach and retraction with KONT
3. Tool change with active tool radius compensation
4. Tool radius compensation with variable tool orientation at transformation
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
2.10 Tool radius compensation
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Fundamentals
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