HEIDENHAIN TNC 370 User Manual page 118

5 Programming Tool Movements
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5.4 Path Contours - Cartesian Coordinates
Example for exercise: Milling a full circle in one block
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Circle center CC: X = 50 mm
Y = 50 mm
Beginning and end
of the circular arc C: X = 50 mm
Y = Omm
Milling depth: Z = -5mm
Tool radius: R = 15mm
Part program
0 BEGIN 360519
MM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Begin program
1 BLK FORM 0.1 Z X+0 Y+O Z-20 .._................... Define workpiece blank
2 BLK FORM 0.2 X+100 Y+lOO Z+O
3 TOOL DEF 6 L+O R+15 ..__...__............................. Define tool
4 TOOL CALL 6 Z S500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Call tool
5
CC X+50 Y+50 . . ..__.__........................................... Coordinates of the circle center CC
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L Z+lOO RO FMAX M6 . . . . . . . . . . . . . . . . . .._................... Insert tool
7 L X+50 Y-40 FMAX _.___..._____..___.......................... Pre-position the tool
8 L Z-5 FMAX M3
9 L X+50 Y+O RL FIOO ___..___.................................. Move under radius compensation to the first contour point
10 RND RI 0 . . . . . . . . . ..____......................................... Smooth approach
11 C X+50 Y+O DR- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mill circular arc C around circle center CC; end point coordi-
nates X = +50 mm and Y = 0; negative direction of rotation
12 RND RI 0 .._._.___..__,,.,..,.......,.,...........................,,.. Smooth departure
13 L X+50 Y-40 RO FMAX
14
L Z+lOO FMAX M2
15 END PGM 360519 MM
Retract tool and end program
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TNC 370
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