User's Manual TNC 360 (from 259 900-11) - heidenhain

5 Programming Tool Movements
5.5 Path Contours – Polar Coordinates
TNC 360
Example for exercise: Tapping
Given Data
Thread:
Right-hand internal thread M64 x 1.5
Pitch P: 1.5 mm
Start angle A : 0°
S
End angle A : 360° = 0° at Z = 0
E E
Thread revolutions n : 8
T
Thread overrun
• at start of thread n : 0.5
S
• at end of thread n : 0.5
E
Number of cuts: 1
Calculating the input values
• Total height H: H = P . n
P = 1.5 mm
n = n + n + n = 8 + 0.5 + 0.5 = 9
T S E
H = 1.5 mm . 9 = 13.5 mm
• Incremental polar coordinate angle IPA:
IPA = n . 360°
n = 9 (see total height H)
IPA = 360° . 9 = 3240°
• Start angle A with thread overrun n S S
n = 0.5
S
n = 1 = 360°, n = 0.5 = 180° (half a revolution)
The starting angle of the helix is advanced by 180°. With positive
rotation this means that A with n = A – 180° = –180°
S S S
• Starting coordinate: Z = P . (n + n ) = –1.5 T S . 8.5 mm = –12.75
Note:
• The thread is being cut in an upward direction towards Z E = 0; therefore
Z S is negative.
Part program
0 BEGIN PGM 360535 MM
1 BLK FORM 0.1 Z X+0 Y+0 Z–20
2 BLK FORM 0.2 X+100 Y+100 Z+0
3 TOOL DEF 1 L+0 R+5
4 TOOL CALL 1 Z S 1500
5 L Z+100 R0 FMAX M6
6 L X+50 Y+50 FMAX
7 CC
8 L Z–12.75 R0 FMAX M3
9 LP PR+32 PA-180 RL F100
10 CP IPA +3240 IZ+13.5 DR+ RL F200
11 L X+50 Y+50 R0
12 L Z+100 FMAX M2
13 END PGM 360535 MM
A =0°
E
A = –180°
A =0°
A
DR+
A = 0°
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