HEIDENHAIN TNC 370 - Page 125

5 Programming Tool Movements
4
5.4 Path Contours - Cartesian Coordinates
To program a tangential arc between two contour elements:
Enter the feed rate for the rounding radius, here F = 100 mm/min.
Resulting NC block: RND 10 F 100
Example for exercise: Rounding a corner
Coordinates of
the corner point: X = 95 mm
Y = 5mm
Rounding radius:
R = 20 mm
Milling depth: Z =-15mm
Tool radius:
R = IOmm
Part program
0 BEGIN PGM 360526 MM . . . . . . . . . . . . . . . . . . . . . . . . . . . Begin
program
1 BLK FORM 0.1 Z X+0 Y+O Z-20 . . .._._................. Define the workpiece blank
2 BLK FORM 0.2 X+1 00 Y+lOO Z+O
3 TOOL DEF 1 L+O R+lO . . . . . . . . . . . . . . ..__.................. Define the tool
4
TOOL CALL 1
Z S1500 . . . . . . . . . . . . . . . . ..__................... Call the tool
5 L Z+lOO RO FMAX M6 . . . . . . . . . . . . . . . . ..___.__..__........... Insert the tool
6 L X-l 0 Y-5 FMAX ___..........................,................. Pre-position the tool
7
L Z-l 5 FMAX M3
8
L X+0 Y+5
RR FIOO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . First contour element
9
L X+95 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Program the first straight line for the corner
10 RND R20 . . . . . . . .._................................................... Round the corner with a tangential arc with radius
R = 20 mm between the two contour elements
1 1 L Y+lOO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Program the second straight line for the corner
12 L X+1 20 Y+120 RO FMAX . . . . .._.__................___.._._ Retract the tool and end program
13 LZ+lOOROFMAXM2
14 END PGM 360526 MM
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5-26
TNC 370