HEIDENHAIN TNC 640 User Manual page 887

Tables and Overviews | Functions of the TNC 640 and the iTNC 530 compared
Function
Circle programming with polar
coordinates
Tool radius compensation on circular
arc or helix with angular length = 0
Compensation of tool length in the
position display
SLII Cycles 20 to 24:
Number of definable contour
elements
Define the working plane
Position at end of SL cycle
HEIDENHAIN | TNC 640 | ISO Programming User's Manual | 10/2017
TNC 640
The incremental rotation angle IPA
and the direction of rotation DR
must have the same sign. Other-
wise, an error message will be
issued
The transition between the
adjacent elements of the arc/helix
is generated. Also, the tool axis
motion is executed right before
this transition. If the element is the
first or last element to be correct-
ed, the next or previous element is
dealt with in the same way as the
first or last element to be correct-
ed
The values L and DL from the tool
table and the value DL from the T
block are taken into account in the
position display
Max. 16384 blocks in up to 12
subcontours
Tool axis in T block defines the
working plane
With the posAfterContPocket
(no. 201007) parameter, you can
define whether the end position
is above the last programmed
position, or whether the tool
moves to clearance height in
the tool axis
If the tool moves to clearance
height in the tool axis,
both coordinates must be
programmed with the first
traverse movement
iTNC 530
The algebraic sign of the direc-
tion of rotation is used if the sign
defined for DR differs from the one
defined for IPA
The equidistant line of the arc/helix
is used for generating the tool path
The values L and DL from the tool
table are taken into account in the
position display
Max. 8192 contour elements
in up to 12 subcontours, no
restrictions for subcontour
The axes of the first positioning
block in the first subcontour
define the working plane
With MP7420, you can define
whether the end position is
above the last programmed
position, or whether the tool
moves only to clearance height
in the tool axis
If the tool moves to clearance
height in the tool axis,
one coordinate must be
programmed with the first
traverse movement
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