Programming: Miscellaneous functions
10.4 Miscellaneous functions for path behavior
10
348
TNC 320 | User's Manual
HEIDENHAIN Conversational Programming | 3/2014
Calculating the radius-compensated path in advance
(LOOK AHEAD): M120
Standard behavior
If the tool radius is larger than the contour step that is to be
machined with radius compensation, the TNC interrupts program
run and generates an error message. M97 (see "Machining small
contour steps: M97", page 343) suppresses the error message, but
it results in dwell marks and will also move the corner.
If the programmed contour contains undercut features, the tool
may damage the contour.
Behavior with M120
The TNC checks radius-compensated paths for contour undercuts
and tool path intersections, and calculates the tool path in advance
from the current block. Areas of the contour that might be
damaged by the tool are not machined (dark areas in figure).
You can also use M120 to calculate the radius compensation for
digitized data or data created on an external programming system.
This means that deviations from the theoretical tool radius can be
compensated.
Use LA (Look Ahead) behind M120 to define the number of blocks
(maximum: 99) that you want the TNC to calculate in advance.
Note that the larger the number of blocks you choose, the higher
the block processing time will be.
Input
If you enter M120 in a positioning block, the TNC continues the
dialog for this block by asking you the number of blocks LA that are
to be calculated in advance.
Effect
M120 must be located in an NC block that also contains radius
compensation
RL
or
RR
. M120 is then effective from this block until
radius compensation is canceled with
R0
M120 LA0 is programmed, or
M120 is programmed without LA, or
another program is called with
PGM CALL
the working plane is tilted with Cycle
19
or the PLANE function
M120 becomes effective at the start of block.
Summary of Contents for TNC 320
Page 4: ...Controls of the TNC 4 TNC 320 User s Manual HEIDENHAIN Conversational Programming 3 2014 ...
Page 5: ...Fundamentals ...
Page 16: ...Contents 16 TNC 320 User s Manual HEIDENHAIN Conversational Programming 3 2014 ...
Page 43: ...1 First Steps with the TNC 320 ...
Page 63: ...2 Introduction ...
Page 81: ...3 Programming Fundamentals file management ...
Page 124: ......
Page 125: ...4 Programming Programming aids ...
Page 152: ......
Page 153: ...5 Programming Tools ...
Page 180: ......
Page 181: ...6 Programming Programming contours ...
Page 232: ......
Page 233: ...7 Programming Data transfer from DXF files or plain language contours ...
Page 251: ...8 Programming Subprograms and program section repeats ...
Page 267: ...9 Programming Q Parameters ...
Page 337: ...10 Programming Miscellaneous functions ...
Page 357: ...11 Programming Special functions ...
Page 379: ...12 Programming Multiple Axis Machining ...
Page 406: ......
Page 407: ...13 Manual operation and setup ...
Page 462: ......
Page 463: ...14 Positioning with Manual Data Input ...
Page 468: ......
Page 469: ...15 Test run and program run ...
Page 497: ...16 MOD functions ...
Page 525: ...17 Tables and overviews ...