Relative Data - HEIDENHAIN TNC 426 B User Manual

Relative data

Data whose values are based on another contour element are
called relative data. The soft keys and program words for entries
begin with the letter R for Relative. The figure at right shows the
entries that should be programmed as relative data.
The coordinates and angles for relative data are always
programmed in incremental dimensions. You must also enter the
block number of the contour element on which the data are based.
The block number of the contour element on which the
relative data are based can only be located up to 64
positioning blocks before the block in which you program
the reference.
If you delete a block on which relative data are based, the
TNC will display an error message. Change the program
first before you clear this message.
Relative data for a free-programmed straight line
Coordinate relative to an end point of block N
Change in the polar coordinate radius relative to block N
Change in the polar coordinate angle relative to block N
Angle between a straight line and another element
Straight line parallel to another contour element
Distance from a straight line to a parallel contour element
Relative data for coordinates of an arc
Coordinates relative to an end point of block N
Change in the polar coordinate radius relative to block N
Change in the polar coordinate angle relative to block N
Angle between the entry tangent of the arc
and another contour element
HEIDENHAIN TNC 426 B, TNC 430
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Y
10
10
Soft key
Soft key
20
45°
90°
20°
FPOL
35
X
123