HEIDENHAIN TNC 640, User Manual, Page: 486 / 948

Miscellaneous Functions | Miscellaneous functions for path behavior
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
11.4 Miscellaneous functions for path
behavior
Machining small contour steps: M97
Standard behavior
The control inserts a transition arc at outside corners. For very
small contour steps, the tool would damage the contour.
In such cases, the control interrupts the program run and generates
the
Tool radius too large
error message.
Behavior with M97
The control determines a path intersection for the contour
elements—such as inner corners—and moves the tool above this
point.
Program
M97
in the same block as the outside corner.
HEIDENHAIN recommends to use the much more
powerful
M120 LA
function instead of
M97
here.
Further information: "Calculating the radius-
compensated path in advance (LOOK AHEAD): M120 ",
page 491
Effect
The
M97
function is only effective in the NC block where it is
programmed.
The control does not completely finish the corner when
it is machined with
M97
. You may wish to rework the
contour with a smaller tool.
Example
5 TOOL DEF L ... R+20
Large tool radius
...
13 L X... Y... R... F... M97
Move to contour point 13
14 L IY-0.5 ... R... F...
Machine small contour step 13 to 14
15 L IX+100 ...
Move to contour point 15
16 L IY+0.5 ... R... F... M97
Machine small contour step 15 to 16
17 L X... Y...
Move to contour point 17