Detailed Description
2.4 Tool radius compensation 2D (TRC)
Basic logic functions: Tool Offset (W1)
88 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
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 resumed 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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