Maximum Retraceable Contour Area - Siemens SINUMERIK 840D sl Function Manual

TE7: Continue machining - retrace support
15.2 Functional description
15.2.4

Maximum retraceable contour area

In multiple machining continuation within a contour area, the reverse travel on the contour is
always possible only up to the last machining continuation point (W). In first-time reverse
travel after RESU start, reverse travel up to the start of the contour range is possible.
This response must be illustrated via the following graph. For the sake of simplicity, the
interruption point (U) is always the same:
Figure 15-4
1st reverse travel
In first-time reverse travel, reverse travel is possible maximum up to the start of the first
contour element (N20) after RESU start (N15) (W1
If reverse travel takes place up to the machining continuation point W1, W1 defines the
maximum RESU range for a possible further reverse travel after machining continuation and
forward travel.
2nd reverse travel
A renewed reverse travel can now be undertaken maximum only up to the last machining
continuation point W2
If reverse travel goes as far back as program continuation point W2, the maximum RESU
range is restricted further.
618
Maximum Retraceable contour range
W1.
max =
).
max
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions