HEIDENHAIN TNC 310 (286 140) Pilot - Manual (Page 24)

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Path Functions
Helix (Only in Polar Coordinates)
Calculations (upward milling direction)
Path revolutions:
n = Thread revolutions + overrun at start and
end of thread
Total height: h = Pitch P x path revolutions n
Incr. coord. angle: IPA = Path revolutions n x 360°
Start angle: PA = Angle at start of thread + angle for
overrun
Start coordinate: Z = Pitch P x (thread revolutions + thread
overrun at start of thread)
Shape of helix
Internal thread Work direction Rotation Radius comp.
Right-hand Z+ DR+ RL
Left-hand Z+ DR– RR
Right-hand Z– DR– RR
Left-hand Z– DR+ RL
External thread
Right-hand Z+ DR+ RR
Left-hand Z+ DR– RL
Right-hand Z– DR– RL
Left-hand Z– DR+ RR
M6 x 1 mm thread with 5 revolutions :
12 CC X+40 Y+25
13 L Z+0 F100 M3
14 LP PR+3 PA+270 RL
15 CP IPA-1800 IZ+5 DR- RL F50