Thread Cutting With Variable Lead: G34, G35 - Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual

See the following illustration for run-in path and run-out path with corner rounding:
Programming example
N10 G54
N20 G90 G0 Z100 X10 M3 S500
N30 G33 Z50 K5 SF=180 DITS=4 DITE=2
N40 G0 X30
N50 G0 X100 Z100
N60 M5
N70 M30
8.5.3

Thread cutting with variable lead: G34, G35

Functionality
Threads with variable lead can be produced in one block with G34 or G35:
● G34 ; Thread with (linearly) increasing lead
● G35 ; Thread with (linearly) decreasing lead.
Both functions otherwise have the same functionality as G33 and have the same prerequisites.
G34 or G35 remain active until canceled by another instruction from this G group (G0, G1, G2, G3, G33...).
Thread lead:
● I or K; Starting thread lead in mm/rev., associated with X or Z axis
Lead change:
In the block with G34 or G35, the address F contains the meaning of the lead change:
The lead (mm per revolution) changes per revolution.
● F ; lead change in mm/
Note: Outside of G34, G35, the address F also indicates the feed or the dwell time for G4. The values programmed there
remain saved.
Determining F
If you already know the starting and final lead of a thread, you can calculate the thread lead change F to be programmed
according to the following equation:
Explanation:
K Thread lead of the axis end point coordinate [mm/rev]
e
K Initial thread lead (under I, K progr.) [mm/U]
a
L Thread length in [mm]
G
Programming and Operating Manual (Turning)
6FC5398-5DP10-0BA2, 06/2015
.
rev. 2
; run-in 4 mm, run-out 2 mm
79