Thread Cycle G - HEIDENHAIN MANUALPLUS 620 User Manual

Thread cycle G31

G31 machine simple threads, successions of threads and multi-start
threads with G24-Geo, G34-Geo or G37-Geo. G31 can also machine a
threading contour defined directly after the cycle call and concluded by
G80.
Parameters
ID Auxiliary contour—ID number of the contour to be machined
NS Contour start block number (reference to basic element G1-
Geo; for successions of threads: block number of the first
basic element)
NE Contour end block number (reference to basic element G1-
Geo; for successions of threads: block number of the last
basic element)
O Identifier start/end (default: 0) A chamfer/rounding arc is
machined:
0: No machining
1: At the start
2: At the end
3: At start and end
4: Chamfer/rounding arc is machined—not the basic
element (prerequisite: Contour section with one element)
J Reference direction:
No input: The reference direction is determined from the
first contour element.
J=0: Longitudinal thread
J=1: Transverse thread
I Approach feed (maximum infeed)
No input and V=0 (constant chip cross section):
I = 1/3 * F
IC Number of cuts. The infeed is calculated from IC and U.
Usable with:
V=0 (constant chip cross section)
V=1 (constant infeed)
B Run-in length
No input: The run-in length is determined from the contour. If
this is not possible, the value is calculated from the kinematic
parameters. The thread contour is extended by the value B.
P Overflow length (run-out length)
No input: The run-out length is determined from the contour.
If this is not possible, the value is calculated. The thread
contour is extended by the value P.
A Approach angle (angle of infeed) (default: 30°)
272
Example: G31
. . .
FERTIGTEIL [FINISHED PART]
N 2 G0 X16 Z0
N 3 G52 P2 H1
N 4 G95 F0.8
N 5 G1 Z-18
N 6 G25 H7 I1.15 K5.2 R0.8 W30 BF0 BP0
N 7 G37 Q12 F2 P0.8 A30 W30
N 8 G1 X20 BR-1 BF0 BP0
N 9 G1 Z-23.8759 BR0
N 10 G52 G95
N 11 G3 Z-41.6241 I-14.5 BR0
N 12 G1 Z-45
ISO Programming