Continue Machining Within Program Loops; Machining Continuation On Full Circles; Automatically Generated Contour Elements - Siemens SINUMERIK 840D sl Function Manual

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TE7: Continue machining at the contour (retrace support) - 840D sl only

19.9 Boundary conditions

Continue machining within program loops

In NC high-level language, program loops can be programmed using:

● CASE/IF-ELSE-ENDIF in conjunction with GOTOB

Risk of collision

Significant contour deviations can occur during the machining if the programmed continuation

point at the programmed contour is the result of a loop run that is not equal to the first loop

If retrace support is performed within program loops, the retrace support is always effective

in the first loop run.

In full circles, the block starting and end points coincide at one contour point. As no clear

differentiation is possible in this case, one always starts from the block start point during

machining continuation on this kind of a contour point. The first part program block following

retrace support is then the circular block.

A contour point just before the block end point of the circular block must be selected to avoid

traversing the circular block after the machining continuation.

The automatic generation of non-linear / non-circular contour elements by the NC takes place,

for example, when programming the following NC functions in the part program:

● Tool radius compensation

For reverse / forward travel as part of RESU these contour elements can be replaced by straight

lines between the start and end of the block.

Function Manual, 01/2015, 6FC5397-2BP40-5BA2

Special functions

Sinumerik 828d Sinumerik 840de sl