5.13 The Control Loop
325
Contour smoothing
In order to achieve smooth machining surfaces with a minimum of machining
time, the following must be kept in mind:
Each jerk (da/dt), which is caused by a change in direction on the contour, or
by a change in the acceleration or in the feed rate, excites vibrations in the
machine. Therefore, the jerk must be limited to a permissible size.
For feed rates above the machining feed rate, an increased jerk and
increased tolerance are both permissible, since they no longer have any
effect on the machining quality.
The tool may go to the limits of the adjustable path tolerance (deviation from
the contour), but must not exceed the tolerance.
Each machine axis is programmed for a certain maximum feed rate, and has
a specified capability for acceleration. For interpolating axes, the accelera-
tion of the slowest axis is decisive.
Feed rates must not fall beneath the minimum value.
In MP_minPathFeed, define the minimum feed rate within a segment (on
the path except at corners), which will not be violated by look-ahead. The
feed rate will be violated by look-ahead only if programmed in the NC block,
or if defined by feed-rate override.
In MP_minCornerFeed, define the minimum feed rate at corners, which will
not be violated by look-ahead. The feed rate will be violated by look-ahead
only if programmed in the NC block, or if defined by feed-rate override.
In MP_maxG1Feed, define the maximum machining feed rate.
• The tolerance from MP_pathTolerance and the jerk from
MP_maxPathJerk are effective for feed rates smaller than or equal to the
feed rate from MP_maxG1Feed.
• For greater feed rates as well as for rapid traverse movements, the higher
tolerance from MP_pathToleranceHi and the higher jerk from
MP_maxPathJerkHi apply.
Independent of the feed rate, define the maximum yank (dj/dt) in
MP_maxPathYank.
MP_pathTolerance considers errors caused by the filter before the position
control loop. The feed-rate override does not affect which jerk or tolerance is
in effect.
Summary of Contents for MILLPWR G2
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