Detailed Description
2.4 Tool: Tool radius compensation 2D (TRC)
Tool Compensation (W1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2-57
• At least two blocks must always be taken into consideration:
– The SAR block itself
– The block, which defines the approach or retraction direction
Further blocks can be programmed between these two blocks.
Machine data:
MD20202 $MC_SAR_MAXNUM_DUMMY_BLOCKS
is used to limit the number of possible dummy blocks.
• If tool radius compensation is activated simultaneously in an approach block, the first
linear block of the SAR contour is the block, in which activation takes place.
The complete contour generated by the SAR function is treated by tool radius
compensation as if it has been programmed explicitly (collision detection, calculation of
intersection, approach behavior NORM/KONT).
• The direction of the infeed movement and the position of the circle plane or the helix axis
are defined exclusively by the active plane (G17 - G19) - rotated with an active frame
where appropriate.
• On approach, a preprocessor stop must not be inserted between the SAR block and the
following block, which defines the direction of the tangent.
Whether programmed explicitly or inserted automatically by the controller, a preprocessor
stop results, in this case, in an alarm.
Response with REPOS
If an SAR cycle is interrupted and repositioned, it resumes at the point of interruption on RMI.
With RME, the contact point is the end point of the last SAR block; with RMB, it is the start
point of the first SAR block.
If RMI is programmed together with DISPR (reapproach at distance DISPR in front of
interruption point), the reapproach point can appear in a subblock of the SAR cycle before
the interruption subblock.
Example 1
The following conditions must be true:
• Smooth approach is activated in block N20
• X=40 (end point); Y=0; Z=0
• Approach movement performed with quadrant (G247)
• Approach direction not programmed, G140 is valid, i.e., because TRC is active (G42) and
compensation value is positive (10), the contour is approached from the right
• Approach circle generated internally (SAR contour) has radius 20, so that the radius of
the tool center path is equal to the programmed value DISR=10
• Because of G341, the approach movement takes place with a circle in the plane, resulting
in a start point at (20, -20, 0)
• Because DISCL=5, point P2 is at position (20, -20, 5) and, because of Z30, point P1 is in
N10 at (20, -20, 30)
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