HEIDENHAIN MANUALplus 620 273
4.19 Thread Cycles
Run-in length B: The slide requires a run-in distance at the start of
thread in order to accelerate to the programmed contouring feed rate
before starting the actual thread.
Example: G31, continued
N 13 G1 X30 BR2
N 14 G1 Z-50 BR0
N 15 G2 X36 Z-71 I12 BR5
N 16 G1 X40 Z-80
N 17 G1 Z-99
N 18 G1 Z-100[thread]
N 19 G1 X50
N 20 G1 Z-120
N 21 G1 X0[thread]
N 22 G1 Z0
N 23 G1 X16 BR-1.5
. . .
AUXILIARY CONTOUR ID"thread"
N 24 G0 X20 Z0
N 25 G1 Z-30
N 26 G1 X30 Z-60
N 27 G1 Z-100
MACHINING
N 33 G14 Q0 M108
N 30 T9 G97 S1000 M3
N 34 G47 P2
N 35 G31 NS16 NE17 J0 IC5 B5 P0 V0 H1 BD0
F2 K10
N 36 G0 X110 Z20
N 38 G47 M109
[G80 contours can be inside or outside]
N 43 G31 IC4 B4 P4 A30 V0 H2 C30 BD0 F6 U3
K-10 Q2
N 44 G0 X80 Z0
N 45 G1 Z-20
N 46 G1 X100 Z-40
N 47 G1 Z-60
N 48 G80
[External thread regardless of the value
defined in BD]
N 49 G0 X50 Z-30
Parameters
V Approach (type of infeed) (default: 0)
0: Constant cross section for all cuts
1: Constant infeed
2: W/ remaining cutting (with distribution of remaining
cuts). First infeed = Remainder of the division of thread
depth/cutting depth. The last cut is divided into four partial
cuts: 1/2, 1/4, 1/8 and 1/8.
3: Infeed is calculated from the pitch and spindle speed
4: Same as MANUALplus 4110
H Type of offset for smoothing the thread flanks (default: 0)
0: Without offset
1: Offset from the left
2: Offset from the right
3: Tool is offset alternately from the right and left
R Depth of remaining cuts—only in conjunction with approach
type V=4 (same as MANUALplus 4110)
C Starting angle (thread start is defined with respect to
rotationally nonsymmetrical contour elements)—(default: 0)
BD External/internal thread (no meaning for closed contours)
0: External thread
1: Internal thread
F Thread pitch
U Thread depth
K Run-out length
K>0: Run-out
K<0: Run-in
The length K should be at least the value of the thread depth.
D Number of thread turns for multi-start thread
E Variable pitch (no effect at present)
Q Number of air cuts after the last cut (for reducing the cutting
pressure in the thread base)—(default: 0)
If a thread has been defined with G24-Geo, G34-Geo or
G37-Geo, the parameters F, U, K and D are not relevant.
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