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Fillet
Selection Parameters 


The Pwr_Fillet command takes a
Power NURBS Brep Object and applies fillets to it based on the filleting specified by
the users selection of edges or faces. The process is as follows:
1) Select the Power NURBS Brep Object to fillet.
2) Click on the _Fillet command (either the icon or the Pwr_Fillet
button)
3) Go into "Modifier Mode" by clicking the modifier tab or use
the "Edge Selection Mode" button. (NOTE: Pwr_Fillet does not work in creation mode).
4) Once in modifier mode click on "Edge Selection Mode" button to specify a current active
set of selected edges, or click on the "Face Selection Mode"
button to specify an active set of selected faces to fillet.
5) Begin picking edges (or faces) to fillet (Ctrl+pick will add additional
edges (or faces)). NOTE: when an edge has a
fillet there will be a circle around it showing the radius of the fillet. The
selected edges will all be given the fillet radius value defined in the
"Radius/Distance" field. For example, if the
current radius was 10 all selected edges would get a radius of 10.
If the "Radius/Distance" value is changed, the fillet values for
all of the fillet set will update (and the representative circles will
also change size in the viewports).
6) "Show Fillet Result" shows the results of the filleting operation and displays
the result. You may continue editing dialog parameters and update the
fillets by selecting the fillet set from the fillet set list and changing
the fillet parameters even when Show Fillets is active. See
information about the fillet set list below.
7) You may create additional fillet sets by clicking on the "Add
Fillet Set" and then beginning the process select more edges by
picking on new edges. It will show you the prefilleted object with the circles
around edges which have fillet definitions.
NOTE: The latest version of Filleting includes
feedback when filleting fails. Little Red squares will appear near
edges and vertices where there is a problem. Edge
Selection Mode: Click
on this button to begin selecting edges to fillet (each edge will be added
to the fillet set)
Face Selection Mode: Click
on this button to begin selecting faces to fillet (each edge of the face will be added
to the fillet set)
Show Fillet Result: This actually does the filleting and displays the
resulting fillets
Add Fillet Set: Creates a new fillet set
Del Fillet Set: Remove a selected fillet set (applies to the
fillet set highlighted in the fillet set list)



Fillet Set List 


The Fillet Set List displays the
fillet set definitions for all of the fillets on the selected Power NURBS
Brep object. The following describes the entries in the fillet set list
in order from left to right. Fillet
Set Number: identification number  starting with 0, the fillet
sets increase in number according to the order of creation
#E = : Lists the number of edges in the fillet set (i.e.
#E = 4 means there are 4 edges in the fillet set)
R= : Radius for the selected fillets
Activated: A = Activated, empty = not activated
Fillet Radius Type: CR = Constant Radius, CD = Constant
Distance, VR = Variable Radius
Fillet Type: CA = Circular Arc, NR = NonRational Arc,
LI = Linear, G1 = G1 Blend Curve, G2 = G2 Blend Curve, G3 = G3 Blend Curve 


Fillet Set Parameters 


The Fillet Set List displays the
fillet set definitions for all of the fillets on the selected Power NURBS Brep
object. The following describes the entries in the fillet set list
in order from left to right. Activated:
If this option is checked, the fillet set is evaluated and
displayed. Turning this option off essentially disables the fillet
set.
#E = : Lists the number of edges in the fillet set (i.e.
#E = 4 means there are 4 edges in the fillet set)
R= : Radius for the selected fillets
Remove Sel: Removes the selected fillet
Add All: Add all edges to the selected edge list



Cross Section Type 


The Cross Section Type defines
what kind of curve is created between the two rails of the fillet.
Normally fillets are created with either linear cross sections for
chamfering or circular cross sections for standard mechanical fillet.
We have also added additional blend types and a Blend Scale so there is a
greater control over the shape of the cross section of the fillet. Circular Arc:
Fillet definition will be a circular arc
NonRational Arc: Creates a fillet with a nonrational
approximated arc
Linear: Normally combined with the "Constant
Distance" option to create a chamfer
G1 Blend Curve: The G1 Blend Curve uses the first derivative of the adjacent faces to make the
tangent direction continuous. It blends the first derivative direction
between two surfaces.
G2 Blend Curve: The G2 Blend Curve uses the second derivative of the adjacent
faces so that the radius of curvature is continuous across the boundary
between the fillet surface and adjacent faces. It blends 2 derivatives
smoothly between two surfaces.
G3 Blend Curve: The G3 Blend Curve uses the third derivative
of the adjacent faces to make the rate of curvature change continuous across the boundaries.
It basically blends 3 derivatives smoothly between the two surfaces. 


Fillet Parameters 


Radius / Distance:
Specifies the fillet radius or chamfer distance
Blend Scale: This value controls relative strength of the
derivatives for the G1, G2 and G3 blending. The values will typically
range between 0.1 and 2.0 where 0.1 looks a lot like a chamfer and 2.0
nearly produces a sharp corner in the fillet. 


Variable Radius 


Use these setting to define
variable radius fillets. The "%" and "Rad"
values are used to define the fillet radius and distance for each fillet
cross section. The "Add Pair" button is used to add cross
sections, and the "Del Pair" button removes cross section
definitions. The following procedure
can be used to create variable radius fillets:
1) Select "Variable Radius" for the "Fillet
Type"
2) Set the desired percent along the curve and radius for the start of the
fillet (i.e. %: 0.0 and Rad: 10.0)
3) Hit "Add Pair" to have them added to the list box
4) Add the intermediate and ending % and Rad pairs. Note that you
should have a value at the end of the curve which will be 100%.
5) Use the "Pick Edges" button and select one or more edges to fillet.
6) Use the "Add Selected" to add those fillets and see the circles
7) Look at the circles put along the edge and determine if variable radius
definition is in the correct orientation along the edge.
8) If it is not in the correct orientation, hit "Reverse" and "Add Selected"
to flip the orientation.
9) Use "Show Fillets" to see the results.
%: Defines the distance (as a
percentage of the overall length) along the selected curve. Not you
must have a 0.0% and a 100.0% value entered.
Rad: Defines the radius of the fillet at the definition point
Add Pair: Creates a fillet cross section definition at the
point defined by the "%" value, using the radius defined by the
"Rad" value.
Remove Pair: Deletes the selected fillet definition
Reverse: Reverses the order of the fillet definitions for the
variable radius fillet so that you can adjust which end of the edge the
variable radius starts on.
Blended Interpolation: Uses a blended interpolation (instead
of linear), for a smoother transition between fillet radii. Makes
fillet surface parallel to the edge at the point along a given edge.

