Siemens SINUMERIK 840D sl Function Manual page 58

W1: Tool offset
2.5 2D tool radius compensation
● G347: Approach with a semicircle
● G348: Retraction with a semicircle
Figure 2-7
Modal G command for defining the approach and retraction contour
This G command is only relevant if the approach contour is a quadrant or semicircle. The
approach and retraction direction can be determined as follows:
● G140:
Defining the approach and retraction direction using active tool radius compensation. (G140
is the basic setting value.)
With positive tool radius:
– G41 active → approach from left
– G42 active → approach from right
● G141:
Approach contour from left, or retract to the left.
● G142:
Approach contour from right, or retract to the right.
● G143:
Automatic determination of the approach direction, i.e. the contour is approached from the
side where the start point is located, relative to the tangent at the start point of the following
block (P
Note
The tangent at the end point of the preceding block is used accordingly on retraction. If the
end point is not programmed explicitly on retraction, i.e. if it is to be determined
implicitly, G143 is not permitted on retraction, since there is a mutual dependency between
the approach side and the position of the end point. If G143 is programmed in this case, an
alarm is output. The same applies if, when G140 is active, an automatic switchover to G143
takes place as a result of an inactive tool radius compensation.
58
Approach behavior depending on G147 to G347 and DISR (with simultaneous activation of
tool radius compensation)
If no tool radius compensation is active (G40), the response is identical to G143. In this
case, an alarm is not output. If the radius of the active tool is 0, the approach and
retraction side is determined as if the tool radius were positive.
).
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Function Manual, 06/2019, A5E47435126B AA
Tools