Keep Tool Radius Compensation Constant - Siemens SINUMERIK 828D Function Manual

W1: Tool offset
18.5 Tool radius compensation 2D (TRC)
18.5.10

Keep tool radius compensation constant

Description
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.
1
The function can be used independently of the type of tool radius compensation (2 / D, 3D face milling, 3D
2
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.
Basic Functions
1489
Function Manual, 09/2011, 6FC5397-0BP40-2BA0