Tools With A Relevant Cutting Edge Length - Siemens SINUMERIK 840DE Programming Manual

8.18

Tools with a relevant cutting edge length

Function
In the case of tools with a relevant tool point direction (turning and grinding tools – tool types
400–599; see chapter "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
preprocessor stop (decoding stop) and hence possibly to deviations from the intended part
contour.
This original functionality changes with regard to:
1. Preprocessor 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
Description
This original functionality was changed as follows:
• A change from G40 to G41/G42 and vice-versa is no longer treated as a tool change. A
• The straight line between the tool edge center points at the block start and block end is
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
preprocessor stop therefore no longer occurs with Transmit.
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.
On approach and retraction with KONT (tool circumnavigates the contour point, see
above subsection "Contour approach and retraction"), superimposition takes place in the
linear part block of the approach or retraction motion. The geometric conditions are
therefore identical for tools with and without a relevant tool point direction. Differences
from the previous behavior occur only in relatively rare situations where the approach or
retraction block does not intersect with an adjacent motion block, see diagram below.
8.18 Tools with a relevant cutting edge length
Tool offsets
8-79