Siemens SINUMERIK 828D Programming Manual page 355

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General structure of an NC block that be compressed

The general structure of an NC block that can be compressed can therefore look like this:

The position values can be entered directly (e.g. X90) or indirectly via parameter settings

(e.g. X=R1*(R2+R3)).

Programming tool orientation using rotary axis positions

Tool orientation can be also specified using rotary axis positions, e.g. with the following

In this case, compression is executed in two different ways, dependent on whether large

radius circular interpolation is executed. If no large radius circular interpolation takes place,

then the compressed change in orientation is represented in the usual way by axial

polynomials for the rotary axes.

Contour accuracy

Depending on the selected compression mode (MD20482 $MC_COMPRESSOR_MODE)

either the configured axis-specific tolerances (MD33100 $MA_COMPRESS_POS_TOL) or

the following channel-specific tolerances – set using setting data – are effective for the

geometry axes and orientation axes for compression:

SD42475 $SC_COMPRESS_CONTUR_TOL (maximum contour deviation)

SD42476 $SC_COMPRESS_ORI_TOL (maximum angular deviation for tool orientation)

SD42477 $SC_COMPRESS_ORI_ROT_TOL (maximum angular deviation for the angle of

rotation of the tool) (only available on 6-axis machines)

Function Manual Basic Functions; 3 to 5-Axis Transformation (F2),

Chapter: "Compression of the orientation"

Job planning

Programming Manual, 07/2010, 6FC5398-2BP40-0BA0

6.6 Compression of the orientation (COMPON, COMPCURV, COMPCAD)

Transformations

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