Detailed Description
2.4 Tool radius compensation 2D (TRC)
Basic logic functions: Tool Offset (W1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
63
DISR
DISRSpecifies the length of a straight approach line or the radius of an approach arc.
Retraction/approach with straight lines
On approach/retraction along a straight line, DISR specifies the distance from the cutter
edge to the start point of the contour, i.e., the length of the straight line with active TRC is
calculated as the total of the tool radius and the programmed value of DISR.
An alarm is displayed:
• If DISR is negative and the amount is greater than the tool radius (the length of the
resulting approach line is less than or equal to zero).
Retraction/approach with circles
Approach/retraction with circlesDISR indicates always the radius of the tool center point
path. If tool radius compensation is activated, a circle is generated internally, the radius of
which is dimensioned such that the tool center path is derived, in this case also, from the
programmed radius.
An alarm is output on approach and retraction with circles:
• If the radius of the circle generated internally is zero or negative
• If DISR is not programmed
• If the radius value ≤ 0.
DISCL
DISCLspecifies the distance from point P2 from the machining plane.
If the position of point P
2
is to be specified by an absolute reference on the axis
perpendicular to the circle plane, the value must be programmed in the form DISCL = AC(
....).
If DISCL is not programmed, points P
1
, P
2
and P
3
are identical with G340 and the approach
contour is mapped from P
1
to P
4
.
The system checks that the point defined by DISCL lies between P
1
and P
3
, i.e., in all
movements, which have a component perpendicular to the machining plane (e.g., infeed
movements, approach movements from P
3
to P
4
), this component must have the same
leading sign. It is not permitted to change direction. An alarm is output if this condition is
violated.
On detection of a direction reversal, a tolerance is permitted that is defined by the machine
data:
MD20204 $MC_WAB_CLEARANCE_TOLERANCE (direction reversal on SAR).
However, if P
2
is outside the range defined by P
1
and P
3
and the deviation is less than or
equal to this tolerance, it is assumed that P
2
is in the plane defined by P
1
and/or P
3
.
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