W1: Tool offset
18.5 Tool radius compensation 2D (TRC)
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
1491
Special cases
• If tool radius compensation is not active (G40), CUTCONON has no effect. No alarm is produced. The G code
remains active, however.
This is significant if tool radius compensation is to be activated in a later block with G41 or G42.
• It is permissible to change the G code in the 7th G-code group (tool radius compensation; G40 / G41 / G42)
with CUTCONON active. 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 compensation.
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 reapproaching the contour with CUTCONOF, the 17th G-code group (approach and retraction behavior
with tool compensation; 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
r
esumed when repositioning.
• The response after reprogramming G41 or G42 when tool radius compensation is already active is similar to
compensation suppression.
The following deviations apply:
- Only linear blocks are permissible
- A single traversing block that contains G41 or G42 is modified so that it ends at the offset point of the start
point in the following block. Thus it is not necessary to insert a dummy block. The same applies to the last
block in a sequence of traversing blocks where each contains G41 or G42.
- The contour is always reapproached with NORM, independent of the G code of the 17th group (approach
and retraction behavior with tool compensation; NORM / KONT).
•If G41 / G42 is programmed several times in consecutive traversing blocks, all blocks are machined as for
CUTCONON, except for the last one.
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