Behavior At Inside Corners - Siemens SINUMERIK 840D sl Function Manual

W5: 3D tool radius compensation
3.1 Function
first traversing block is used for the offset calculation. The circle block with constant orientation
is inserted immediately before the second traversing block.
See also "Example 1: Orientation change at outside corner during 3D circumferential milling
(Page 268)".
Intermediate blocks without relevant traversing information
Intermediate blocks without relevant traversing information (neither tool orientation nor position
of geometry axes are changed) are permissible. The intersection procedure is applied to the
adjacent blocks as if these intermediate blocks did not exist. In the same manner, tool direction
motions in the tool direction may also be programmed in intermediate blocks.
3.1.2.3

Behavior at inside corners

For the 3D-TRC, only adjacent traversing blocks are taken into consideration for the calculation
of the intersecting point.
If the orientation is not changed at the block limit, then the contour need only be considered in
the plane vertical to the tool axis. In this case, the tool cross-section is a circle which touches
the two contours. The geometric relations in this plane are identical to those for 2
Behavior during orientation changes
If the orientation changes on a block transition, the tool moves in the inside corner so that it is
constantly in contact with the two blocks forming the corner.
Path segments must be long enough to ensure that the contact points of the tool do not cross
the block limits into other blocks when the orientation changes at an inside corner.
Figure 3-2
When the orientation changes in a block that is one of the two blocks forming the inside corner,
then it is no longer possible to adhere to the programmed relationship between path position
and associated orientation. This is because the orientation must reach its end value even
though the path end position is not reached. This response is identical to the response of
synchronized axes with 2
242
Orientation changes at inside corner
/ D tool radius compensation.
1
2
Function Manual, 06/2019, A5E47435126B AA
/ D-TRC.
1
2
Tools