Siemens SINUMERIK 840D sl Function Manual page 868

Synchronous Spindles (S3)
14.1 Brief description
The overlaid traversing movement of the FS can be initiated in various ways:
● Programmable position offset of FS for AUTOMATIC and MDA:
● Manual position offset of FS:
As soon as the FS executes the overlaid traversing movement, IS "Overlaid movement"
(DB31, ... DBX98.4) is set to the 1 signal.
The overlaid movement is executed optimally in terms of time at the maximum possible FS
speed with COUPON. With an offset change by means of SPOS, the positioning velocity can
be specified with FA[Sn] and manipulated by an override (can be selected through IS
"Feedrate correction valid for spindle " DB31, ... DBX17.0) is affected.
Note
For more information about specifying the position speed with FA[Sn] in:
References:
/FB1/ Function Manual, Basic Functions; Spindles (S1), Section "Spindle modes, positioning
operations"
Setpoint correction
The setpoint correction of the system variable $AA_COUP_CORR[Sn] impacts on all
subsequent following spindle programming in the same way as a position offset and
corresponds to a DRF offset in the MCS.
Example: establish correction value
If a coupling offset of 7° has been programmed using COUPON(....,77) and if a mechanical
offset of 81° has come about as a result of closing the workpiece support fixture, a correction
value of 4° is calculated:
The system variables return the following values for the following spindle:
$P_COUP_OFFS[S2] ; programmed position offset = 77°
$AA_COUP_OFFS[S2] ; setpoint-end position offset = 77°
$VA_COUP_OFFS[S2] ; actual value-end position offset approx. 77°
$AA_COUP_CORR[S2] ; correction value = 4°
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– Language instructions COUPON and SPOS allow the position reference between FS
and LS to be changed while synchronous mode is active, see Section "Selecting
synchronous mode of the parts program."
– In JOG (JOG continuous or JOG incremental) mode
Superimposition of FS using the handwheel or with plus or minus traversing keys
when synchronous operation is active.
– in AUTOMATIC and MDA modes
Superimposition of FS with handwheel using DRF offset
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions