Tool Radius Compensation; Specification Of Memory Type - Siemens SINUMERIK 840D Function Manual

Mc axes and spindles

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Table of Contents

M3: Coupled axes

14.2 Curve tables

Tool radius compensation

Tool radius compensation can produce segments for which the following axis or leading axis

have no movement. A missing movement of the following axis does not normally represent any

problem. As against this, a missing movement of the leading axis requests a specification as to

how such discontinuities are to be handled, i.e., whether or not a curve table should be

generated in these cases. This specification is done in the machine data settings:

MD20900 $MC_CTAB_ENABLE_NO_LEADMOTION (curve tables with discontinuity of the

following axis)

In the case of a curve table that contains segments without leading axis movement (this means

that the following axis jumps at this point), the following axis can only make a jump within its

dynamic limits (max. velocity and max. acceleration). This means that there is always a

deviation from the programmed curve.

If there is no memory specification while defining or deleting a curve table, the memory type can

be determined through the following machine data:

MD20905 $MC_CTAB_DEFAULT_MEMORY_TYPE (default memory type for curve tables)

No curve tables that contain a discontinuity in the following axis are produced. Alarm 10949 is

output and program processing is aborted.

Curve tables with a discontinuity in the following axis can be generated. If a segment contains

a discontinuity in the following axis, Alarm 10955 is output but program processing is continued.

Curve tables with a discontinuity in the following axis can be created without an alarm being

Curve tabels are normally created in the static NC memory.

Curve tabels are normally created in the dynamic NC memory.

Axes and spindles

Function Manual, 06/2019, A5E47437747B AA

Sinumerik 840d sl