HEIDENHAIN TNC 406 - Manual (Page 159)

138 8 Programming: Cycles
8.4 Er
osion Cy
cles
Contouring program PGM
The cycle parameter PGM determines the contouring program that is
to be used by the TNC.
Sparking-out distance in percent PRC
This parameter determines how far the TNC should retract for
sparking-out after having reached the eroding depth. The value is to be
entered as a percentage of the total contour length.
Requirements for the contouring program:
„ The contour programmed in the contouring program
must be a closed contour, such as a rectangle.
„ The start of the contour should be in the middle, so that
the contour is scalable with Cycle 11.
„ No coordinates may be programmed for the eroding axis
in the contouring program. The eroding axis and eroding
depth are specified in Cycle 14.
„ No M functions that cause a geometry reset, such as
M02 or M30, may be programmed in the contouring
program.