July 2013 6.10 Contouring behavior 893
Rounding
of corners
If you program M90, the tool velocity in following-error mode is kept constant
at corners without radius compensation. This causes a corner rounding that
varies with the feed rate (see the User’s Manual).
If you program M112 or M124, defined arcs will be inserted at the corners
regardless of the feed rate (see the User’s Manual). The rounding arcs
generate twice as many NC blocks, and the feed rate is now only limited by
the radial acceleration.
The function M124 (contour smoothing filter) is considered to be valid syntax
even without parameter T (minimum point interval). M124 alone (without
parameter T) deactivates the filter function. M124 can thus be deactivated in
an NC program or NC macro (e.g. at the beginning of a TOOLCALL macro).
With MP7680 bit 7, specify whether the rounding arcs should always be
inserted or only if the acceleration from MP1060.x or MP1070 has been
exceeded at the corners.
With MP7680 bit 8, specify whether a rounding arc or a cubic spline is to be
inserted between lines during the M function M112. The feed rate is
reduced enough to prevent any excessive jerk. This does not apply if F MAX
is programmed. The cubic spline produces an additional jerk reduction.
However, it requires a longer processing time than an inserted rounding,
and due to the longer path of the spline (compared to the circle), the
machining time also increases.
If you have set bit 8, you can specify with bit 9 whether the jerk will remain
constant on the spline. The contour speed is adjusted for constant jerk.
MP7680 Machine parameter with multiple function
Input: Bit 7 – Insertion of a defined rounding arc or spline:
0: Defined rounding arcs are always inserted
1: Defined rounding arcs are always inserted if the acceleration
from MP1060.x or MP1070 was exceeded
Bit 8 – Insertion of a rounding arc or cubic spline:
0: Rounding arc is inserted
1: A cubic spline is inserted instead of a rounding arc
Bit 9 – Constant jerk on spline (Bit 8 = 1):
0: No constant jerk
1: Constant jerk
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