Siemens SINUMERIK 840Di Function Manual page 1751

2.4.10 Keep tool radius compensation constant
Meaning
The "Keep tool radius compensation constant" function is used to suppress tool radius
compensation for a number of blocks, whereby a difference between the programmed and
the actual tool center path traveled set up by tool radius compensation in the previous blocks
is retained as the compensation.
It can be an advantage to use this method when several traversing blocks are required
during line milling in the reversal points, but the contours produced by the tool radius
compensation (follow strategies) are not wanted.
Activation
The "Keep tool radius compensation constant" function is activated with the G code
CUTCONON (CUTter compensation CONstant ON) and deactivated with the G code
CUTCONOF (CUTter compensation CONstant OFF).
CUTCONON and CUTCONOF form a modal G-code group.
The initial setting is CUTCONOF.
The function can be used independently of the type of tool radius compensation (2
face milling, 3D circumferential milling).
Normal case
Tool radius compensation is normally active before the compensation suppression and is still
active when the compensation suppression is deactivated again.
In the last traversing block before CUTCONON, the offset point in the block end point is
approached. All following blocks, in which compensation suppression is active, are traversed
without compensation. However, they are offset by the vector from the end point of the last
offset block to its offset point. These blocks can have any type of interpolation (linear,
circular, polynomial).
The deactivation block of the compensation suppression, i.e., the block that contains
CUTCONOF, is compensated normally. It starts in the offset point of the start point. One linear
block is inserted between the end point of the previous block, i.e., the last programmed
traversing block with active CUTCONON, and this point.
Circular blocks, for which the circle plane is perpendicular to the compensation plane
(vertical circles), are treated as though they had CUTCONON programmed. This implicit
activation of compensation suppression is automatically canceled in the first traversing block
that contains a traversing motion in the compensation plane and is not such a circle. Vertical
circle in this sense can only occur during circumferential milling.
Tool Compensation (W1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2.4 Tool: Tool radius compensation 2D (TRC)
Detailed Description
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