Behavior At Outer Corners - Siemens sinumerik 840D sl Function Manual

Detailed description
2.1 Circumferential milling
2.1.2

Behavior at outer corners

In the same manner as 21/2D tool radius compensation procedures, a circle is inserted at
outer corners for G450 and the intersection of the offset curves is approached for G451.
With nearly tangential transitions, the procedure for active G450 is as with G451 (limit angle
is set via machine data). Conversely, if G451 is active, a circle is also inserted (procedure as
for G450) if there is no intersection or if the corner angle exceeds a specific value (MD).
If there is a change in orientation between the two traversing blocks, a circle is always
inserted.
G450
Outside corners are treated as if they were circles with a 0 radius. The tool radius
compensation acts on these circles in the same way as on any other programmed path.
The circle plane extends from the final tangent of the first block to the start tangent of the
second block.
The orientation can be changed during block transition.
A change in orientation between two programmed blocks is executed either before the circle
block or in parallel to it. Circles are always inserted. The command DISC is not evaluated.
Programming
• ORIC: Change in orientation and path movement in parallel
• ORID: Change in orientation and path movement consecutively
The ORIC and ORID program commands are used to determine whether changes in
orientation programmed between two blocks are executed before the inserted circle block is
processed or at the same time.
When the orientation needs to be changed at outside corners, the change can be
implemented in parallel to interpolation or separately from the path motion. When ORID is
programmed, the inserted blocks are executed first without a path motion (blocks with
changes in orientation, auxiliary function outputs, etc.). The circle block is inserted
immediately in front of the second of the two traversing blocks which form the corner.
ORIC
If ORIC is active and there are two or more blocks with changes in orientation (e.g. A2= B2=
C2=) programmed between the traversing blocks, then the inserted circle block is distributed
among these intermediate blocks according to the absolute changes in angle.
12
(ORIentation Change Continuously)
(ORIentation Change Discontinuously)
Special functions: 3D Tool Radius Compensation (W5)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0