HEIDENHAIN TNC 640 User Manual page 347

Data Transfer from CAD Files | CAD import (option 42)
Operating notes:
The control also transfers two workpiece-blank
definitions (BLK FORM) to the contour program. The
first definition contains the dimensions of the entire
CAD file. The second one, which is the active one,
contains only the selected contour elements, so that
an optimized size of the workpiece blank results.
The control only saves elements that have been
selected (blue elements), which means that they
have been given a check mark in the List View
window.
Dividing, extending and shortening contour elements
Proceed as follows to modify contour elements:
The Graphics window is active for the contour
selection
To select the starting point, select an element or
the intersection between two elements (using
the + icon)
Select the next contour element by clicking it
with the mouse
The control displays the machining sequence as
a dashed line.
When the element is selected the control
displays it in blue.
If the elements cannot be connected the control
displays the selected element in gray.
If further contour elements in the selected
machining sequence are selectable, the control
highlights these elements in green. At junctions,
the control chooses the element with the least
deviation in direction.
Click the last green element to add all elements
to the contour program.
Operating notes:
You select the machining sequence of the contour
with the first contour element.
If the contour element to be extended or shortened
is a straight line, then the control extends or shortens
the contour element along the same line. If the
contour element to be extended or shortened is a
circular arc, then the control extends or shortens the
contour element along the same arc.
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
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