HEIDENHAIN TNC 640, User Manual, Page: 628 / 948

Multiple-Axis Machining | FUNCTION TCPM (option 9)
13
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
Type of interpolation between the starting and end
position
The control provides two functions for defining the type of inter-
polation between the starting and end position:
PATHCTRL AXIS
determines that the tool tip
moves on a straight line between the starting
and end position of the respective NC block
(
Face Milling ). The direction of the tool axis
at the starting and end positions corresponds
to the respective programmed values, but the
tool circumference does not describe a defined
path between the starting and end positions.
The surface produced by milling with the tool
circumference (
Peripheral Milling ) depends on
the machine geometry
PATHCTRL VECTOR
determines that the tool tip
moves on a straight line between the starting
and end position of the respective NC block and
that the direction of the tool axis is interpolated
between the starting and the end position so
that a plane results from machining (
Peripheral
Milling )
To obtain the most continuous multi-axis movement
possible, define Cycle 32 with a
tolerance for rotary
axes
.
The tolerances of the rotary axes and the path deviation
should have the same magnitude. The greater the
tolerance for the rotary axes is defined, the greater the
contour deviations during peripheral milling.
Further information:
Cycle Programming User's
Manual
Example
...
13 FUNCTION TCPM F TCP AXIS SPAT PATHCTRL AXIS
Tool tip moves along a straight line
14 FUNCTION TCPM F TCP AXIS POS PATHCTRL VECTOR
Tool tip and tool directional vector move in one plane
...