Miscellaneous Functions For Path Behavior; Machining Small Contour Steps: M97 - HEIDENHAIN TNC 620 User Manual

11
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:
compensated path in advance (LOOK AHEAD): M120
(Miscellaneous Functions software option)", page 479
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
...
13 L X... Y... R... F... M97
14 L IY-0.5 ... R... F...
15 L IX+100 ...
16 L IY+0.5 ... R... F... M97
17 L X... Y...
474
Miscellaneous Functions | Miscellaneous functions for path behavior
"Calculating the radius-
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2017
Large tool radius
Move to contour point 13
Machine small contour step 13 to 14
Move to contour point 15
Machine small contour step 15 to 16
Move to contour point 17