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

W5: 3D tool radius compensation
19.2 Circumferential milling
Figure 19-6
19.2.2

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
(ORIentation Change Continuously)
• ORID: Change in orientation and path movement consecutively
(ORIentation Change Discontinuously)
700
Change of corner type during machining
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions