Contour Approach And Retraction (Norm, Kont, Kontc, Kontt) - Siemens SINUMERIK 840DE Programming Manual

Tool offsets

8.9 Contour approach and retraction (NORM, KONT, KONTC, KONTT)

8.9 Contour approach and retraction (NORM, KONT, KONTC, KONTT)
Function
You can use these functions to adapt the approach and retraction paths, for example,
according to the desired contour or shape of the blanks.
Only G1 blocks are permitted as original approach/retraction blocks for the two functions
KONTC and KONTT. The control replaces these by polynomials for the relevant
approach/retraction path.
Programming
NORM
Or
KONT
Or
KONTC
Or
KONTT
Parameters
NORM
KONT
KONTC
KONTT
KONTC
The contour point is approached/exited with a continuous curvature. No acceleration step
change occurs at the contour point. The path from the starting point to the contour point is
interpolated as a polynomial.
KONTT
The contour point is approached/exited along a continuous tangent. An acceleration step
change might occur at the contour point. The path from the starting point to the contour point
is interpolated as a polynomial.
8-32
The tool travels directly in a straight line and is
positioned perpendicular to the contour point
The tool traverses the contour point according to the
programmed corner behavior G450 or G451.
Tool reaches/leaves contour point with continuous
curvature.
Continuous curvature includes continuous tangent. See
below. With continuous curvature means at constant
acceleration.
Tool reaches/leaves contour point along continuous
tangent.
Generally, continuous tangent is not continuous
acceleration.
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals