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Roughing Corner Options

When you rough a surface, you can add a filleting move to a
sharp corner. You can also create slowdown motions before a
corner and ramp up motions after a corner.
Toolpath Filleting
• Add a filleting move to a sharp
corner
• SMOOTH_SHARP_
CORNERS
– NO
– CONSTANT_RADIUS
– RADIUS_BY_ANGLE
– MAX_RADIUS
• SMOOTH_RADIUS
Progressive Slowdown for
Corners
• Slowdown motions and ramp
up motions
• CORNER_SLOWDOWN
• SLOWDOWN_LENGTH
• SLOWDOWN_PERCENT
• NUMBER_SLOWDOWN_
STEPS
Toolpath Filleting

Roughing Corner Options 1
Figure 1 – No Toolpath Filleting

Roughing Corner Options 2
Figure 2 – Toolpath Filleting Applied
• You can add a filleting move to a sharp corner. This option is available for
roughing, re-roughing, volume milling, and local milling.
• SMOOTH_SHARP_CORNERS – Specifies the way sharp toolpath corners
are rounded while machining. The options are:
– No – A rounding radius is not used while machining sharp toolpath
corners. This is the default.
– CONSTANT_RADIUS – Rounds sharp corners using a rounding radius
having a value equal to that of the SMOOTH_RADIUS parameter.
– RADIUS_BY_ANGLE – Rounds sharp corners using a rounding
radius having a value based on the angle of the sharp corner and the
SMOOTH_RADIUS value.
– MAX_RADIUS – Rounds sharp corners using the largest possible radius
between 10% and 100% of the SMOOTH_RADIUS value.
• SMOOTH_RADIUS – Specifies the radius for filleting or smooth corner
machining.
– The minimum value must be 10% of the tool diameter if the
SMOOTH_SHARP_CORNERS parameter is defined and not set to
CONSTANT_RADIUS.
– The maximum allowable value is 50% of the step-over distance.
Progressive Slowdown for Corners
• You can create slowdown motions before a corner and ramp up motions
after a corner. A number of parameters control the tool movement.
– CORNER_SLOWDOWN – Specifies the use of a progressive slowdown
in the feed rate before a corner followed by an acceleration to the cut
feed rate after the corner. The default is NO.
– SLOWDOWN_LENGTH – Specifies the length of the move for the
slowdown. The same length is used for the acceleration after the
corner. The length is measured from the sharp edge or the beginning of
the rounding fillet, if any. If one of the edges is an arc, the distance is
taken along the arc.
– SLOWDOWN_PERCENT – Specifies the feed rate at the end of the
slowdown. For example, if the cut feed rate is 300 millimeters per minute
and the value of the SLOWDOWN_PERCENT is 10, then the feed rate
at the end of the slowdown is 30 millimeters per minute.
– NUMBER_SLOWDOWN_STEPS – Specifies the number of steps in
which the slowdown takes place. A larger number of steps results
in a smoother slowdown. At each step, the feed rate is reduced by
(100–SLOWDOWN_PERCENT)/NUMBER_SLOWDOWN_STEPS.
During acceleration after the corner, the number of steps is halved

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