Siemens SINUMERIK 828D Function Manual page 1461

Hide thumbs Also See for SINUMERIK 828D:

Table of Contents

Supplementary conditions

The approach and retraction blocks are polynomials in the following two variants. Therefore, they are only

available for control variants, which support polynomial interpolation.

With KONTT, approach and retraction to/from the contour is with a constant tangent. The curvature at the

block transition is not usually constant.

With KONTC, not only the tangent but also the curvature is constant at the transition, with the result that a jump

in acceleration can no longer occur on activation/deactivation.

Although KONTC includes the KONTT property, the constant tangent version KONTT is available on its own,

because the constant curvature required by KONTC can produce undesired contours.

The continuity condition is observed in all three axes. It is thus possible to program a simultaneous path

component perpendicular to the compensation plane for approach/retraction.

Only linear blocks are permitted for the original approach and retraction blocks with KONTT/KONTC. These

programmed linear blocks are replaced in the control by the corresponding polynomial curves.

KONTT and KONTC are not available in 3D variants of tool radius compensation (CUT3DC, CUT3DCC,

If they are programmed, the control switches internally to NORM without an error message.

Example for KONTC

The two figures below show a typical application for approach and retraction with constant curvature:

The full circle is approached beginning at the circle center point. The direction and curvature radius of the

approach circle at the block end point are identical to the values of the next circle. Infeed takes place in the Z

direction in both approach/retraction blocks simultaneously.

The associated NC program segment is as follows:

$TC_DP1[1,1]=121

$TC_DP6 [1,1]=10

N10 G1 X0 Y0 Z60 G64 T1 D1 F10000

N20 G41 KONTC X70 Y0 Z0

N40 G40 G1 X0 Y0 Z60

Basic Functions

Function Manual, 09/2011, 6FC5397-0BP40-2BA0

18.5 Tool radius compensation 2D (TRC)

; Milling tool

; Radius 10 mm

; Full circle

W1: Tool offset

Sinumerik 840d sl