Feedrate With G33, G34, G35 (Thread Cutting) - Siemens SINUMERIK 808D Function Manual

Reference:
SINUMERIK 808D/SINUMERIK 808D ADVANCED Programming and Operating Manual
Interface signals
If the revolutional feedrate is active, IS "Revolutional feedrate" (DB3300.DBX0001.2) is set.
If the G96/G332 function is active, the IS "Constant cutting rate active" (DB390x.DBX2002.0) is set for the spindle.
Alarms
● If no F word is programmed at G1, G2, G3, ..., alarm 10860 is issued. An axis movement is not possible. However,
please note: SD42110 DEFAULT_FEED!
● If F0 is programmed, alarm 14800 is issued.
● If G95 is active and the spindle is stationary, an axis movement is not possible. No alarm is issued.
Notes
● If the "Dry run feedrate" function is activated and the program is started, the feedrates programmed in combination with
G1, G2, G3, CIP, CT will be replaced by the feedrate value stored in SD42100 DRY_RUN_FEED, see Section "Program
processing with dry run feedrate (DRY) (Page 94)".
● The velocity of the traversing movement of an axis in "JOG" mode is determined by the machine data/setting data.
18.1.2

Feedrate with G33, G34, G35 (thread cutting)

Types of thread cutting
G33 - thread with constant pitch
G34 - thread with (linearly) increasing pitch
G35 - thread with (linearly) decreasing pitch
Axis velocity
With respect to G33, G34, or G35 threads, the axis velocity for the thread length results from the set spindle speed and the
programmed pitch. However, the maximum axis velocity defined in MD32000 MAX_AX_VELO cannot be exceeded.
The feedrate F is not relevant. It is, however, kept in the memory.
The axis velocity, e.g. for a cylinder thread, results from the set spindle speed (S) and programmed pitch (K):
Fz [mm/min] = speed S [rev/min] * pitch K [mm/rev]
Note
For G34 and G35 the pitch change in mm/rev
Reference:
SINUMERIK 808D/SINUMERIK 808D ADVANCED Programming and Operating Manual
NC stop, single block
NC stop and single block are only active after completion of thread chaining.
Information
● The spindle speed override switch must remain unchanged during thread machining (tapping).
● The feedrate override switch is irrelevant in a block with G33, G34, G35.
Programmable runin and runout path: DITS, DITE
The run-in and run-out path is to be traversed in addition to the required thread. The starting and braking of the axis (both
axes in case of a tapered thread) are performed in these areas. This path depends on the pitch, spindle speed, and the axis
dynamics (configuration).
Function Manual
01/2017
is programmed under the F address.
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