Siemens SINUMERIK 840D sl Function Manual page 94

W1: Tool offset
2.7 Keep tool radius compensation constant
Figure 2-28
Special cases
● If tool radius compensation is not active (G40), CUTCONON has no effect. No alarm is
produced. The G command remains active, however.
This is significant if tool radius compensation is to be activated in a later block with G41 or
G42.
● A change from the G command to the 7th G group (tool radius compensation; G40 / G41 /
G42) with active CUTCONON is permissible. A change to G40 is active immediately.
The offset used for traversing the previous blocks is traveled.
● If CUTCONON or CUTCONOF is programmed in a block without traversing in the active
compensation plane, activation is delayed until the next block that has such a traversing
motion.
● If CUTCONON is programmed with active tool radius compensation and not canceled
before the end of the program, the traversing blocks are traversed with the last valid offset.
The same applies for reprogramming of G41 or G42 in the last traversing block of a program.
● If tool radius compensation is activated with G41 or G42 and CUTCONON is also already
active, activation of compensation is delayed until the next traversing block with
CUTCONOF.
● When repositioning with CUTCONOF, the 17th G group (approach and retraction behavior
with tool offset; NORM / KONT) is evaluated, i.e. a bypass circle is inserted if necessary for
KONT. A bypass circle is inserted under the same conditions as for activation of tool radius
compensation with G41 or G42.
● The number of blocks with suppressed tool radius compensation is restricted:
MD20252 $MC_CUTCOM_MAXNUM_SUPPR_BLOCKS (Maximum number of blocks with
compensation suppression)
If it is exceeded, machining is aborted and an error message issued.
The restriction is necessary because the internal block processing in the last block before
CUTCONON must be resumed when repositioning.
94
Sample program for contour suppression
Function Manual, 06/2019, A5E47435126B AA
Tools